H151F Rebuild (1 Viewer)

[ArmyFJ]

Got the bearings in! Started putting it all back together.

Tower of Power - the output shaft all back together:

Output shaft back in the intermediate plate.

Input shaft and counter shaft installed.

Shift forks and shafts installed - those shaft interlocking pins were tricky to get back into the hole and stay. After dropping them a few times, I used a little grease keep them in place.

 

[ArmyFJ]

So I messed up when I initially pressed the reverse gear and hub onto the output shaft. I forgot the rear bearing retainer...it is in the FSM - but no picture of that step so of course I skipped it; had to pull the hub again...

This is after I installed it:

Reverse gear, synchro, hub, sleeve, fork, and idler re-installed...

Edit: This bolt type wheel puller from HF was perfect for pulling the reverse and 5th gear hub. I re-threaded some 6 inch long 5/16in NC bolts to 8mm x 1.25 and they held up just fine for both hubs.

 

[ArmyFJ]

All back together. Hoping to put it back in tomorrow.

 

[ArmyFJ]

Transmission and transfer back in. Took the better part of the day to get it all back in with some help from my son. That transmission tunnel is just so tight. Took a quick test drive and the shifting is great - love how it feels with the Red Line MT 90 gear oil.

 

[DivByZero]

Thanks for this very detailed thread! I'm keeping an eye out for the right H150F box to come up for sale here at the right price. The box on my 80 is working fine, but I've never dug into a transmission before, and I'm considering tackling a rebuild of a spare box as a bit of a learning exercise. The pictures you've provided really help me get my head around what this would involve. Hard to get a feel for it looking at the parts diagrams.

How has your box been going since the rebuild? Any issues, or smooth sailing? Anything you'd do differently the second time around?

 

[ArmyFJ]

Thanks for this very detailed thread! I'm keeping an eye out for the right H150F box to come up for sale here at the right price. The box on my 80 is working fine, but I've never dug into a transmission before, and I'm considering tackling a rebuild of a spare box as a bit of a learning exercise. The pictures you've provided really help me get my head around what this would involve. Hard to get a feel for it looking at the parts diagrams.

How has your box been going since the rebuild? Any issues, or smooth sailing? Anything you'd do differently the second time around?

It is still running really well - no leaks from either the engine, transmission or the t-case and still a blast to drive.

If I was doing it over I might think (maybe only for a second) about doing the synchro rings for 1st and 2nd. Mine were just okay but I might have been able to get a little smoother shifts with new ones. That said, I have heard it’s not a sure thing that replacing the synchros will help or if it does it will be short lived.
Also, after the transmission has warmed up, its about a smooth and fast as a truck transmission can be.

 

[DivByZero]

I'm bumping this awesome thread to say I just got a fun jigsaw puzzle yesterday arvo:

This is a H150F, reportedly from a 1993 HZJ80. The guy I bought it off got it working, no issues, shifting well enough but worn synchros of course. He planned to do a full rebuild to have a refreshed box for his cruiser. He got as far as getting a mechanic to tear it down. Then it sat in his garage for a year, and his wife wanted it gone. So some cash changed hands, and now it's sitting in my garage.

There are some parts missing. Anything that was too worn already went in the bin apparently, which from a quick eye over means some of the synchros, and possibly a few snap rings and a bearing or two, haven't taken a full inventory yet. I'd probably be replacing all of that anyway. All the important parts seem to be present, from a very quick approximate accounting of bits. There's a little bit of surface rust on some of the gears, but nothing that seemed worrying from a quick look.

This is the H150, not the H151, which I actually haven't seen pictures of a rebuild for online. One reason why I'm planning to tack this rebuild onto this thread is to be able to compare the guts of the two boxes, so the differences are clearer for anyone else in the future. This box has the 21 spline input shaft for example, not the 14 spline on the H151:

 

[DivByZero]

So far I've done little more than lay the parts out and get a gauge for what's there, make sure there's no big problems from missing bits:

And a rough shot at laying things out in order to make it easier:

And the box of "everything else":

I'm not on a clock here, because I already have a working H150 in my 80, and no urgent need to get this rebuild done, so I'm planning to chip away at it and take my time. I'll be having a good look at the synchros and seeing what's possible too around parts compatibility. Curious if the three piece synchro rings used in the VDJ79 for example can be used in this box just by switching over the 3rd gear. Going to look closely at what's possible when I start tackling this. For now, I'm probably just going to do a proper inventory in the next few days, build up a "parts list" of what's missing, and oil everything properly and wrap it so it can sit for a bit without deteriorating. I'll post my updates in this thread, as I think it'll be useful to have references for both these very similar boxes in one thread.

 

[ArmyFJ]

Awesome! I am not sure on the synchros - I think they are specific to the models and transmission updates. At the very least I think you could cross reference the clutch hubs, the synchros, and the gears to make sure they all match. But I am not sure if they would fit an older/different main shaft. The taper on the cones for the gears varies a bit. As I was rebuilding mine there were variations even within a couple of years. All the best on the rebuild and thanks for sharing!

 

[mudgudgeon]

Synchros and gears changed a few times.
80series H151 & H150 had different synchro rings.
No triple synchros in the h150 from memory.

I think I may have the full FSM for these transmissions on a flash drive

 

[mudgudgeon]

Synchros and gears changed a few times.
80series H151 & H150 had different synchro rings.
No triple synchros in the h150 from memory.

I think I may have the full FSM for these transmissions on a flash drive

the FSM I have is an extract from the 80 series Chassis repair manual

 

[DivByZero]

Just been going over compatibility by checking the full Toyota parts catalog. The differences between years don't seem as big a concern to me. From going through the catalog, there are effectively three distinct 5-speed transmission types:

H150F: [1990/01 - 2001/03]

H151F - Type A: [1990/01 - ...]

H151F - Type B: [1998/01 - ...]

The H150F and H151F Type A boxes were used in the 80 series from 1990/01 - 1999/09, with the HZJ80 getting the H150F and the HDJ80/FZJ80 versions getting the H151F Type A. Type "B" boxes were first used from 1998/01, and replaced the H150F entirely by 1999/09. From this point on, any 1HZ engines in a Landcruiser were effectively using the HDJ80 version of the transmission. The H151F type A and B boxes have significant differences in some of their gear shift forks and the corresponding sleeves and gears, as well as the main output shaft. They appear to share the same case, but internally the gear assemblies are generally incompatible, so you don't want to be trying to mix and match between Type A and Type B boxes. If you take any pre-98 gearbox from any 5-speed manual Landcruiser though, it will be a H150F or a H151F Type A.

Looking within the H150F and H151F Type A line of boxes then to check on revisions from year to year, one important thing to note is that the same output shaft, 33321-60120, is used on both the H150F and the H151F Type A, so in other words for all 5-speed Landcruiser variants and year models, 1990/01 - 1998/01. This gives us some important guarantees around compatibility. The same counter gear, 33421-60110, is also used for all versions of the H150F. Likewise, the same counter gear, 33421-60090, is also used for all revisions of the H151F Type A. So apart from the differences in gear ratios between the H150F/H151F, they don't seem to change within the entire 1990/01 - 1998/01 year range in any way that would affect fitment to either the output shaft or meshing with the counter gears.

I've done a full breakdown of all internal changes within both the H150F, and the H151F up until 1998/01 when the "Type B" H151F boxes came out. The lists below show those changes, sorted by the date at which they occur, allowing you to see the points at which new revisions of the box arrive. Any lines appended with the notation "[BC]" indicate that the new part is listed as a substitute for the previous part, indicating a backwards-compatible (IE, non-breaking) part revision.

H150F:
1992/01 - RING, SHAFT SNAP (FOR FRONT BEARING) - Changed 90520-99009 to 90520-99010
1992/01 - BEARING (FOR INPUT SHAFT FRONT) - Changed 90363-50006 to 90363-50007
1992/01 - SHAFT, INPUT - Changed 33301-60020 to 33301-60021
1992/01 - BEARING (FOR OUTPUT SHAFT REAR) - Changed 90363-45017 to 90363-45016
1992/01 - RING, SHAFT SNAP (FOR OUTPUT SHAFT BEARING) - Changed 90520-96002 to 90520-99009
1992/01 - BEARING (FOR REVERSE GEAR) - Changed one of 90520-41006/7/8 to 90364-44003

1992/08 - RING, SYNCHRONIZER, NO.2 (3rd Gear Side) - Changed 33368-60040 to 33368-60041
1992/08 - GEAR, 3RD - Changed 33034-60010 to 33034-60011 [BC]
1992/08 - GEAR, 2ND - Changed 33033-60010 to 33033-60011
1992/08 - RING SET, SYNCHRONIZER, NO.2 - Changed 33367-60030 (single synchro) to 33038-60011 (triple synchro)
1992/08 - SLEEVE, TRANSMISSION HUB, NO.1 - Changed 33363-60010 to 33363-60030
1992/08 - WASHER, 1ST GEAR THRUST - Changed 33348-60010 to 33348-60020

1993/08 - SHAFT, GEAR SHIFT FORK, NO.2 - Changed 33243-60080 to 33243-60081 [BC]
1996/01 - FORK, REVERSE SHIFT - Changed 33211-60040 to 33211-66041 [BC]

1996/08 - GEAR, 2ND - Changed 33033-60011 to 33033-60060
1996/08 - RING SET, SYNCHRONIZER, NO.2 - Changed 33038-60011 (triple synchro) to 33038-60020 (triple synchro)
1996/08 - HUB, TRANSMISSION CLUTCH, NO.1 - Changed 33361-60010 to 33361-60030
1996/08 - SLEEVE, TRANSMISSION HUB, NO.1 - Changed 33363-60030 to 33363-60040
1996/08 - SPRING, COMPRESSION (FOR SHIFT DETENT BALL LOW SIDE) - Changed just on new Shift Fork No.2 from 90501-14124 to 90501-14155
1996/08 - FORK, GEAR SHIFT, NO.1 - Changed 33212-60040 to 33212-60050
1996/08 - SHAFT, GEAR SHIFT FORK, NO.1 - Changed 33242-60040 to 33242-60080
1996/08 - SHAFT, GEAR SHIFT FORK, NO.2 - Changed 33243-60081 to 33243-60100
1996/08 - SHAFT, GEAR SHIFT FORK, NO.3 - Changed 33244-60030 to 33244-60050
1996/08 - SHAFT, GEAR SHIFT FORK, NO.4 - Changed 33245-60040 to 33245-60060

1996/09 - GEAR, 1ST - Changed 33032-60010 to 33335-60110 [BC]
1996/09 - GEAR, REVERSE - Changed 33031-60010 to 33331-60050 [BC]


H151F:
1992/08 - SLEEVE, TRANSMISSION HUB, NO.2 - Changed 33364-60040 to 33364-60050
1992/08 - GEAR, 3RD - Changed 33034-60020 to 33034-60021 [BC]
1992/08 - RING SET, SYNCHRONIZER, NO.3 - Changed 33039-60010 to 33039-60011
1992/08 - GEAR, 2ND - Changed 33033-60020 to 33033-60021 [BC]
1992/08 - RING SET, SYNCHRONIZER, NO.2 - Changed 33038-60010 (triple synchro) to 33038-60011 (triple synchro)
1992/08 - RING SET, SYNCHRONIZER, NO.1 - Changed 33037-60010 to 33037-60011
1992/08 - SLEEVE, TRANSMISSION HUB, NO.1 - Changed 33363-60020 to 33363-60030

1993/08 - SHAFT, GEAR SHIFT FORK, NO.2 - Changed 33243-60080 to 33243-60081 [BC]
1996/01 - FORK, REVERSE SHIFT - Changed 33211-60040 to 33211-66041 [BC]

1996/08 - SLEEVE, TRANSMISSION HUB, NO.2 - Changed 33364-60050 to 33354-60060
1996/08 - GEAR, 3RD - Changed 33034-60021 to 33034-60050
1996/08 - RING SET, SYNCHRONIZER, NO.3 - Changed 33039-60011 to 33039-60020
1996/08 - HUB, TRANSMISSION CLUTCH, NO.2 - Changed 33362-60010 to 33362-60020
1996/08 - GEAR, 2ND - Changed 33033-60021 to 33033-60070
1996/08 - RING SET, SYNCHRONIZER, NO.2 - Changed 33367-60011 (triple synchro) to 33038-60020 (triple synchro)
1996/08 - HUB, TRANSMISSION CLUTCH, NO.1 - Changed 33361-60010 to 33361-60040
1996/08 - SLEEVE, TRANSMISSION HUB, NO.1 - Changed 33363-60030 to 33363-60050
1996/08 - GEAR, 1ST - Changed 33032-60020 to 33032-60090
1996/08 - RING SET, SYNCHRONIZER, NO.1 - Changed 33037-60011 to 33037-60030
1996/08 - SPRING, COMPRESSION (FOR SHIFT DETENT BALL LOW SIDE) - Changed just on new Shift Fork No.2 from 90501-14124 to 90501-14155
1996/08 - FORK, GEAR SHIFT, NO.1 - Changed 33212-60040 to 33212-60050
1996/08 - SHAFT, GEAR SHIFT FORK, NO.1 - Changed 33242-60040 to 33242-60080
1996/08 - SHAFT, GEAR SHIFT FORK, NO.2 - Changed 33243-60081 to 33243-60100
1996/08 - SHAFT, GEAR SHIFT FORK, NO.3 - Changed 33244-60030 to 33244-60050
1996/08 - SHAFT, GEAR SHIFT FORK, NO.4 - Changed 33245-60040 to 33245-60060

1996/09 - GEAR, REVERSE - Changed 33031-60010 to 33331-60050 [BC]
1996/10 - GEAR, 1ST - Changed 33032-60090 to 33335-60100 [BC]
1997/06 - SLEEVE, TRANSMISSION HUB, NO.1 - Changed 33363-60050 to 33363-60051 [BC]


As you can see from these lists, in 80 series Landcruisers manufactured up until 1998/01, there are effectively the following revisions of the 5 speed manual transmissions:

H150F:
1990/01 - Original
1992/01 - Rev 1 (Input shaft, bearing, output shaft bearing changes)
1992/08 - Rev 2 (2nd gear change - single to triple synchro)
1996/08 - Rev 3 (2nd gear change, shifting system revision)

H151F:
1990/01 - Original
1992/08 - Rev 1 (2nd/3rd gear+synchro change)
1996/08 - Rev 2 (1st/2nd/3rd gear+synchro change, shifting system revision)

 

[ArmyFJ]

That’s some great info. Thank you for sharing.

I suppose there is some opportunity to update the components like you laid out. My guess is you would have to change the hub sleeve, gear, and synchros for each gear pair. But that would be a fairly expensive experiment.

 

[OGBeno]

Just been going over compatibility by checking the full Toyota parts catalog. The differences between years don't seem as big a concern to me. From going through the catalog, there are effectively three distinct 5-speed transmission types:

H150F: [1990/01 - 2001/03]
View attachment 3301216

H151F - Type A: [1990/01 - ...]
View attachment 3301219

H151F - Type B: [1998/01 - ...]
View attachment 3301220

The H150F and H151F Type A boxes were used in the 80 series from 1990/01 - 1999/09, with the HZJ80 getting the H150F and the HDJ80/FZJ80 versions getting the H151F Type A. Type "B" boxes were first used from 1998/01, and replaced the H150F entirely by 1999/09. From this point on, any 1HZ engines in a Landcruiser were effectively using the HDJ80 version of the transmission. The H151F type A and B boxes have significant differences in some of their gear shift forks and the corresponding sleeves and gears, as well as the main output shaft. They appear to share the same case, but internally the gear assemblies are generally incompatible, so you don't want to be trying to mix and match between Type A and Type B boxes. If you take any pre-98 gearbox from any 5-speed manual Landcruiser though, it will be a H150F or a H151F Type A.

Looking within the H150F and H151F Type A line of boxes then to check on revisions from year to year, one important thing to note is that the same output shaft, 33321-60120, is used on both the H150F and the H151F Type A, so in other words for all 5-speed Landcruiser variants and year models, 1990/01 - 1998/01. This gives us some important guarantees around compatibility. The same counter gear, 33421-60110, is also used for all versions of the H150F. Likewise, the same counter gear, 33421-60090, is also used for all revisions of the H151F Type A. So apart from the differences in gear ratios between the H150F/H151F, they don't seem to change within the entire 1990/01 - 1998/01 year range in any way that would affect fitment to either the output shaft or meshing with the counter gears.

I've done a full breakdown of all internal changes within both the H150F, and the H151F up until 1998/01 when the "Type B" H151F boxes came out. The lists below show those changes, sorted by the date at which they occur, allowing you to see the points at which new revisions of the box arrive. Any lines appended with the notation "[BC]" indicate that the new part is listed as a substitute for the previous part, indicating a backwards-compatible (IE, non-breaking) part revision.

H150F:
1992/01 - RING, SHAFT SNAP (FOR FRONT BEARING) - Changed 90520-99009 to 90520-99010
1992/01 - BEARING (FOR INPUT SHAFT FRONT) - Changed 90363-50006 to 90363-50007
1992/01 - SHAFT, INPUT - Changed 33301-60020 to 33301-60021
1992/01 - BEARING (FOR OUTPUT SHAFT REAR) - Changed 90363-45017 to 90363-45016
1992/01 - RING, SHAFT SNAP (FOR OUTPUT SHAFT BEARING) - Changed 90520-96002 to 90520-99009
1992/01 - BEARING (FOR REVERSE GEAR) - Changed one of 90520-41006/7/8 to 90364-44003

1992/08 - RING, SYNCHRONIZER, NO.2 (3rd Gear Side) - Changed 33368-60040 to 33368-60041
1992/08 - GEAR, 3RD - Changed 33034-60010 to 33034-60011 [BC]
1992/08 - GEAR, 2ND - Changed 33033-60010 to 33033-60011
1992/08 - RING SET, SYNCHRONIZER, NO.2 - Changed 33367-60030 (single synchro) to 33038-60011 (triple synchro)
1992/08 - SLEEVE, TRANSMISSION HUB, NO.1 - Changed 33363-60010 to 33363-60030
1992/08 - WASHER, 1ST GEAR THRUST - Changed 33348-60010 to 33348-60020

1993/08 - SHAFT, GEAR SHIFT FORK, NO.2 - Changed 33243-60080 to 33243-60081 [BC]
1996/01 - FORK, REVERSE SHIFT - Changed 33211-60040 to 33211-66041 [BC]

1996/08 - GEAR, 2ND - Changed 33033-60011 to 33033-60060
1996/08 - RING SET, SYNCHRONIZER, NO.2 - Changed 33367-60011 (triple synchro) to 33038-60020 (triple synchro)
1996/08 - HUB, TRANSMISSION CLUTCH, NO.1 - Changed 33361-60010 to 33361-60030
1996/08 - SLEEVE, TRANSMISSION HUB, NO.1 - Changed 33363-60030 to 33363-60040
1996/08 - SPRING, COMPRESSION (FOR SHIFT DETENT BALL LOW SIDE) - Changed just on new Shift Fork No.2 from 90501-14124 to 90501-14155
1996/08 - FORK, GEAR SHIFT, NO.1 - Changed 33212-60040 to 33212-60050
1996/08 - SHAFT, GEAR SHIFT FORK, NO.1 - Changed 33242-60040 to 33242-60080
1996/08 - SHAFT, GEAR SHIFT FORK, NO.2 - Changed 33243-60081 to 33243-60100
1996/08 - SHAFT, GEAR SHIFT FORK, NO.3 - Changed 33244-60030 to 33244-60050
1996/08 - SHAFT, GEAR SHIFT FORK, NO.4 - Changed 33245-60040 to 33245-60060

1996/09 - GEAR, 1ST - Changed 33335-60010 to 33335-60110 [BC]
1996/09 - GEAR, REVERSE - Changed 33031-60010 to 33331-60050 [BC]


H151F:
1992/08 - SLEEVE, TRANSMISSION HUB, NO.2 - Changed 33364-60040 to 33364-60050
1992/08 - GEAR, 3RD - Changed 33034-66020 to 33034-66021 [BC]
1992/08 - RING SET, SYNCHRONIZER, NO.3 - Changed 33039-60010 to 33039-60011
1992/08 - GEAR, 2ND - Changed 33033-60020 to 33033-60021 [BC]
1992/08 - RING SET, SYNCHRONIZER, NO.2 - Changed 33367-60010 (triple synchro) to 33038-60011 (triple synchro)
1992/08 - SLEEVE, TRANSMISSION HUB, NO.1 - Changed 33363-60020 to 33363-60030

1993/08 - SHAFT, GEAR SHIFT FORK, NO.2 - Changed 33243-60080 to 33243-60081 [BC]
1996/01 - FORK, REVERSE SHIFT - Changed 33211-60040 to 33211-66041 [BC]

1996/08 - SLEEVE, TRANSMISSION HUB, NO.2 - Changed 33364-60050 to 33354-60060
1996/08 - GEAR, 3RD - Changed 33034-60021 to 33034-60050
1996/08 - RING SET, SYNCHRONIZER, NO.3 - Changed 33039-60011 to 33039-60020
1996/08 - HUB, TRANSMISSION CLUTCH, NO.2 - Changed 33362-60010 to 33362-60020
1996/08 - GEAR, 2ND - Changed 33033-60021 to 33033-60070
1996/08 - RING SET, SYNCHRONIZER, NO.2 - Changed 33367-60011 (triple synchro) to 33038-60020 (triple synchro)
1996/08 - HUB, TRANSMISSION CLUTCH, NO.1 - Changed 33361-60010 to 33361-60040
1996/08 - SLEEVE, TRANSMISSION HUB, NO.1 - Changed 33363-60030 to 33363-60050
1996/08 - GEAR, 1ST - Changed 33032-60020 to 33032-60090
1996/08 - SPRING, COMPRESSION (FOR SHIFT DETENT BALL LOW SIDE) - Changed just on new Shift Fork No.2 from 90501-14124 to 90501-14155
1996/08 - FORK, GEAR SHIFT, NO.1 - Changed 33212-60040 to 33212-60050
1996/08 - SHAFT, GEAR SHIFT FORK, NO.1 - Changed 33242-60040 to 33242-60080
1996/08 - SHAFT, GEAR SHIFT FORK, NO.2 - Changed 33243-60081 to 33243-60100
1996/08 - SHAFT, GEAR SHIFT FORK, NO.3 - Changed 33244-60030 to 33244-60050
1996/08 - SHAFT, GEAR SHIFT FORK, NO.4 - Changed 33245-60040 to 33245-60060

1996/09 - GEAR, REVERSE - Changed 33031-60010 to 33331-60050 [BC]
1996/10 - GEAR, 1ST - Changed 33032-60090 to 33335-60100 [BC]
1997/06 - SLEEVE, TRANSMISSION HUB, NO.1 - Changed 33363-60050 to 33363-60051 [BC]


As you can see from these lists, in 80 series Landcruisers manufactured up until 1998/01, there are effectively the following revisions of the 5 speed manual transmissions:

H150F:
1990/01 - Original
1992/01 - Rev 1 (Input shaft, bearing, output shaft bearing changes)
1992/08 - Rev 2 (2nd gear change - single to triple synchro)
1996/08 - Rev 3 (2nd gear change, shifting system revision)

H151F:
1990/01 - Original
1992/08 - Rev 1 (2nd/3rd gear+synchro change)
1996/08 - Rev 2 (1st/2nd/3rd gear+synchro change, shifting system revision)

Wow. Someone has a lot of time.

Great work.

 

[Darije]

I've been waitnig parts for my H151F.

 

[DivByZero]

Wow. Someone has a lot of time.

Great work.

Yeah... my employer may have paid me to dig through the EPC for four hours yesterday... can neither confirm nor deny. Hey, they've got plenty of unpaid overtime over the years, I call it a fair swap.

 

[DivByZero]

I've been waitnig parts for my H151F.
View attachment 3301975

How much did that rebuild kit set you back out of curiosity? I haven't priced things up yet. I'm biased towards Toyota genuine parts, but it's good to know the alternatives.

 

[DivByZero]

So today I managed to take a proper accounting of what I have and what's missing. I have the fifth gear synchro, missing the rest. Missing one of the hubs, but it's available new and not too expensive. Missing three of the bearings for the gears. A couple of the hub sleeves look a bit worn, might price up replacements. Apart from that, I gave all the internal bits a quick run through the parts washer:

Then gave everything moisture sensitive an oil bath in some good clean synthetic oil, and bagged and tagged it all:

Well, bagged at least. Ran out of time to label things, but now everything is properly "parked" and won't deteriorate. I'll work up some shopping lists in the next couple of days.

 

[Darije]

How much did that rebuild kit set you back out of curiosity? I haven't priced things up yet. I'm biased towards Toyota genuine parts, but it's good to know the alternatives.

563 €uro + import TAX etc. I didn't have a much choice in my country. There is only few LC80 and I have to buy everything of the internet and import it. One set is for H151F and other is for transfer case

 

[SNLC]

How’s the input shaft?

For what it’s worth I’ve rebuilt 4 H151fs for my various cruisers and rather than trying to rebuild the original 80 series boxes, I have purchased H150Fs from VDJ79s. You can swap the input shaft and bellhousing and it bolts straight in. Gives you triple syncros on the gears and a few other improvements. I’ve paid $500au for each VDJ79 gearbox (they’ve have between 33,000-78,000kms).

Much cheaper than rebuilding the 80 series boxes and a better box overall. Also gives a slightly shorter first and second ratio which works better for off-roading.

I thought it was the H152 now found behind the 1VD? I do know the GR7x uses the H150 and maybe a certain model of 200.

Cheers