1HD-T transmission choices

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Joined
May 28, 2009
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I'm looking at swapping a 1HD-T (the 1HD-FTE is just too hard to find) into an (american) FJ80. I'm trying to piece together what all I'll need, as I want to know before I start spending money -- don't want to create more problems for myself than I have to! The options seem bewildering though.

I have looked at a 1HD-T with a transmission, though I don't know if it's an A440 or A442. The benefit of this one is that I know everything bolts together because it all comes bolted together. If it's an A440, is that a terrible thing? I've found conflicting statements about that transmission.

Or are there other auto transmissions I should consider?

I'm also wondering about a manual transmission, a 5 or 6 speed modern one. Would be nice to have the extra-high top gear for mileage. Found one post on this site asking about 6-speeds, but didn't see any answers. What manual transmissions will bolt to the 1HD? I saw something about the H151F, any others?

FYI, I'm not going to be driving this thing across any ravines -- it'll mainly be a go-anywhere vehicle that drives nicely both on and in mild off-road situations. So I'm more concerned about something that will give me as high mileage as possible than something with an ultra-low first gear. All the same, I don't want my transmission crapping out on the Cassiar Highway, so I'd like something relatively bulletproof.

Thanks for any help you can provide!
 
I will be one that will tell you if you take care of the tranny you are fine with a AF440 or AF442, and if you are worried or want to upgrade there are some posts for upgrade parts from OZ fo rthe tranny as well asn bullet proof Torque converters.

If you go with the 5 speed most likely it will be the H151, older one that should still work with the 1Hd-T is the H55F, if you want a low or granny first gear you are going to want the H150, same as H151 but lower first gear. If you can get a half cut (SOR.com) go with whateer combo it comes with.

Cheers,

Michael
 
Thanks Michael, that's what I was hoping to hear. I'm moving up from a 1996 Tacoma that has spoiled me rotten: 205,000 miles and the only non-routine maintenance I've had to do is replace the infamous starter contacts at 150K and the original clutch at 200K. So I want the Land Cruiser to be just as reliable.

My big question right now: how specific are Toyota engines, transmissions and bellhousings? That is, if I pick up a 1HD-T, and an H151F transmission separately, am I going to have to scrounge for a bellhousing that fits that specific combo? Or would most any H151F bellhousing be likely to fit?

I've always been partial to manual transmissions, partly because of the tactile "feel" and partly because you really have to beat on a manual transmission hard for it to fail. Conversely, this forum is full of talk about autos that develop hiccups and shifting quirks and slippages and refuse to get into gear, though I suspect that's partly because some people are beating the crap out of them on the trail! And manuals come with a clutch that has to be replaced. Tradeoffs. Just thinking out loud.

Thanks much for the sor.com link too, I hadn't found that before and it looks like a great parts source!
 
H151's can be fragile too apparently and also leave you with higher rev's a t freeway speed. H55f's will work with a 1HZ input shaft and a bend in the shifter. A440's are a good tranny and are mechanical, A442's are decent as well but are electronic so make sure if you use one that you have all of the associated TPS stuff.
 
The H150 was the more fragile 5-speed. It came stock behind a (non-turbo) 1HZ. But, it does have a lower first gear (4.5:1 or so). The H151 is very strong, came stock behind the 1HDT, 1HDFT and 1HDFTE; It has something like a 4:1 first gear. An H55F can be mated to a 1HDT, BUT... the shifter would be very far forward in an 80. It's been done (well, a 12HT w/H55F) in an 80, but it takes some fancy bending.

You might consider an 1HZ with aftermarket turbo. Lynchmob has one for sale, along with an H151 tranny, here: https://forum.ih8mud.com/diesel-jdm-parts/219395-12h-t-1hz-engines-available.html. The 1HDT and 1HDFT motors are hard to come by these days. Japan4x4 (Dave Stedman) and ENS Cruisers (in B.C.) will be your best bet for parts once you have made the conversion.
 
I don't think that H150 are less strong than the H151 .. actually IMOP both share the same capacity .. just the H150 with lower gears at 1st and 2nd ..

Other diference are the input shaft .. but whith a isuzu clutch you can run a 300mm flywheel and disc in a H150 ..

Anycase both are .84 IIRC at 5ft so no much OD really ..

The auto have a better OD range .. just if I woud go in this route, a extreme valve body and complete rebuild with a nice tranny cooler and gauge come to my mind ..
 
yeah, the 5th gear is sorta lacking... but with 33's and my 4.1 gears, it cruises fine on highway. I drove an auto 1HDFT a few weeks ago, i much prefer "rowing the gears" then the slushbox.
 
yeah, the 5th gear is sorta lacking... but with 33's and my 4.1 gears, it cruises fine on highway. I drove an auto 1HDFT a few weeks ago, i much prefer "rowing the gears" then the slushbox.

me too .. actually was one of the reasons to swap my A442 to my actual H150 .. I'm just around 140km/h at 3k rpm .. that it's more than enough to me ..
 
You might consider an 1HZ with aftermarket turbo. Lynchmob has one for sale, along with an H151 tranny, here: https://forum.ih8mud.com/diesel-jdm-parts/219395-12h-t-1hz-engines-available.html. The 1HDT and 1HDFT motors are hard to come by these days. Japan4x4 (Dave Stedman) and ENS Cruisers (in B.C.) will be your best bet for parts once you have made the conversion.

That may be a good option, though the 1HD-T I've found (with trans) runs about the same as the 1HZ. I'm hoping to keep my costs down so spending $7.5K for an engine plus a $1.5K turbo is just a little out of my reach. If I can find it cheaper (saw a 1HZ on here a couple weeks ago for $2K, unfortunately it's sold) that may be a good option.

I imagine the turbo would get it in the performance range of a 1HD-T and I just wouldn't have the direct injection. I'd originally written off the 1HZ because the performance numbers aren't very attractive. I can get a 1KZ-T, with transmission, for $4K that makes the same power and torque with better mileage. Interestingly, the 1KZ makes its power at about 200 RPM lower than the 1HZ. I'm sure adding the turbo would change all that.

me too .. actually was one of the reasons to swap my A442 to my actual H150 .. I'm just around 140km/h at 3k rpm .. that it's more than enough to me ..

That sounds high. By my calculations that means you're at 2300 RPMs at 65mph/110kph. Since it's a diesel I'd like to be at a max of 2000 RPMs at that speed, maybe less depending on the engine (Toyota says the 1HD-T makes max torque at 1400). Does that mean I should be looking at 3.7 gears?

In general, it looks like the A440 gives me the tallest overdrive, the H150 and H151 both have much lower first gears, which I wouldn't mind for towing.
 
Oh and the manual trans means I have to scrounge and retrofit a clutch pedal and hydraulic actuator from somewhere since all the FJ80s around seem to have automatic transmissions.
 
After some research:

The A440 would give me the tallest OD (1:0.717), though first gear isn't terribly low at 1:2.95.
The H150 with 3.7 gears will also give me an OK OD with a sufficiently low first gear, equivalent 1:4.05 first gear and 1:0.79 fifth gear.
The H55F with 3.7 gears would be the ideal manual combo (if I can make it fit) with an equivalent 1:0.75 fifth gear and 1:4.3 first gear.
 
I'm not sure, but I don't think they make 3.7 gears for the 80. I'm most likely wrong though... :)
 
You are correct sir... if "they" is Toyota that is.
Never looked into aftermarket.
Probably not a big market for 3.7s
Would put 3.7s in to my 1HD-T 5spd 80 project if I could get em.
Oh well nothing a set of 285s can't cure.
 
That sounds high. By my calculations that means you're at 2300 RPMs at 65mph/110kph. Since it's a diesel I'd like to be at a max of 2000 RPMs at that speed, maybe less depending on the engine (Toyota says the 1HD-T makes max torque at 1400). Does that mean I should be looking at 3.7 gears?.

I'm running 315 so my speedo aren't accurate anymore .. but actually I'm more interested in lookiing for 4.88 than 3.70 .. coz 100km/h it's more than enought to me .. and I would like to drive around the city just in 3rd gear .. :D
 
I understand that stock 80 series with 5-speed 1HDT came with 3.7 gears. But trying to hunt that down used would be tough, and buying new would be silly.

shaneiseminger: the H55F has an even lower first then you think: 4.85:1

But, comparing the H55F to an H151, the H55F's stick is about 8" further forward. There is some 80 out there with a 12HT and H55F, but it took some tricky bending.
 
I understand that stock 80 series with 5-speed 1HDT came with 3.7 gears.

Nopo we have several HDJ80 manual .. and all are 4.11

But, comparing the H55F to an H151, the H55F's stick is about 8" further forward. There is some 80 out there with a 12HT and H55F, but it took some tricky bending.

as a engine and trannyy swap .. ?

Stone it's on it but with an auto A440 ..
 
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there was a Czech-spec HDJ80 in the U.S. that had 3.7:1 gears, stock. must be by country.
 
Get the JDM A442F auto, the jdm model in the earily 90's was a full hydro version, which means no tps, no selnoids etc. ... ive put a few k's on mine on and off road and altho it tends to kick into OD a little eairly (around 65km under lite accel) it can be adjusted to suite.
 

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