My R151F needs replacing... H55 or H152? (HZJ78)

[TheBussman]

I would look into how difficult it would be to use a brand new r155f. the transfer-case pattern is different for sure but maybe you can unbolt your current rear housing and it will fit? Not sure if the input shaft is different. bell housing should bolt up.

if not i vote rebuild upgrade the r151 or H55 i think they shift pretty good for a truck transmission.

 

[rick_d]

So the original 6A410 transmission failed twice after a "rebuild". You don't know what the reasons were as it was before your ownership.

Anyway. H152 can be found NEW in US and with conversion parts can be made to fit 1HZ/HD. H15X series will require fabricating a new tunnel cover. The x member *should* work. Your bellhousing will not. The 275mm flywheel will work (and going to 300mm is just wasted money on a 1HZ power plant). The transfer shifter is different. I found a used one on ebay.au or you can buy the parts and put together from UAE. Having rebuilt a hf1a case ($$$), I would just buy a new one. 36120-60351 is for hdj79 and is $1500 from UAE. Don't forget to get your drive shafts rebuilt or better yet buy a pair of "take off" from Cruiserparts.net in NH. The R series fit the H series - I am running these in my 79 series.

Just remember when said and done your engine still has 225,000 miles and it is indirect injection.

best of luck.

 

[renago]

I would go with H150/151 .
I understand you are overlanding , AND been stranded with a unworking gearbox in THE Middle of nowhere is not nice .
Un less with R151 you use only 4th gear for travelling on tar !
However , must say that If you open THE R151 , and pick all THE brocken parts ( alluminium ) AND reclose THE box , you can still drive some good distances .
I did 10 k km After that !

 

[JuanJ]

Hello,

I am late to the party.

As with almost everything else, the decision depends on the resources you have and the intended use/application.

As mentioned above, the R151F is reliable, particularly the later model units. Some extreme uses, especially in Australia, gave it a bad name.

On the other hand, H15x transmissions are heavy duty. They are clicky when shifting, but this is a feedback mechanism intended to confirm gear shifting.

Notice that gasoline/petrol 75 Series Troopies had the H150F, as well as current gasoline models.

Diesel 80 Series Land Cruisers had the H150F transmission also.

You will need the transfer case if you choose an H15x. Modification and fabrication may be necessary to mate them with your engine.

If money is not an issue, swap in an H15x and its transfer case.

If money is an issue, replace your R151F with a new one.







Juan

 

[svsisu]

@gifu has a barely used H150 in the classifieds. You would need a correct bell housing and input shaft, and maybe a transfer case.

SOLD - Truckee CA: HDJ80 H150 transmission nearly new

I have a H150 transmission that has less than 5000 miles on it. Shifted butter smooth. It’s basically new. Input shaft for 1HDT, 1HZ, 1FZ is easily swapped over. Can deliver to Valley Hybrids or Bay Area. Asking $2800 obo.

forum.ih8mud.com

 

[prwillard2]

@gifu has a barely used H150 in the classifieds. You would need a correct bell housing and input shaft, and maybe a transfer case.

SOLD - Truckee CA: HDJ80 H150 transmission nearly new

I have a H150 transmission that has less than 5000 miles on it. Shifted butter smooth. It’s basically new. Input shaft for 1HDT, 1HZ, 1FZ is easily swapped over. Can deliver to Valley Hybrids or Bay Area. Asking $2800 obo.

forum.ih8mud.com

was just gonna post this!

 

[Aidan Klimenko]

@gifu has a barely used H150 in the classifieds. You would need a correct bell housing and input shaft, and maybe a transfer case.

SOLD - Truckee CA: HDJ80 H150 transmission nearly new

I have a H150 transmission that has less than 5000 miles on it. Shifted butter smooth. It’s basically new. Input shaft for 1HDT, 1HZ, 1FZ is easily swapped over. Can deliver to Valley Hybrids or Bay Area. Asking $2800 obo.

forum.ih8mud.com

was just gonna post this!

Awesome, I'll get in touch! Thanks for pointing this out.

 

[OGBeno]

You will need a new transfer case if you go with this transmission, as well as front and rear driveshafts, transmission mount, transfer case lever/actuation system, clutch slave, all clutch bits, etc.

It won’t be a direct fit in the slightest.

 

[Workhorse]

Plus bell housing plus all the stuff Rick said too. Exedy does make a nice HD clutch and pressure plate for the 275mm H150.

H152 is a nice transmission I have one behind my HDFTE in my 100. It’s sweet. Not sure it’d be worth spending all the time and energy to find all the proper Factory parts and then swap one in to go behind a HZ though to be honest.
HDT/HDFT/HDFTE? Yes

HZ not so much.

H55 into your truck? Not even a consideration

@rick_d knows his stuff better than just about anyone regarding these type of questions. I’d replace with new and be done with it Aidan.

 

[Aidan Klimenko]

Plus bell housing plus all the stuff Rick said too. Exedy does make a nice HD clutch and pressure plate for the 275mm H150.

H152 is a nice transmission I have one behind my HDFTE in my 100. It’s sweet. Not sure it’d be worth spending all the time and energy to find all the proper Factory parts and then swap one in to go behind a HZ though to be honest.
HDT/HDFT/HDFTE? Yes

HZ not so much.

H55 into your truck? Not even a consideration

@rick_d knows his stuff better than just about anyone regarding these type of questions. I’d replace with new and be done with it Aidan.

I hear ya. I'm just having a tough time wrapping my head around replacing a gearbox that's failed twice with the same gearbox. But money talks, and the swap to the H15x definitely would be spendy.

Does anyone know of where to get these "reinforcement kits" for the R151 here stateside? If I did stick with a R, I'd love to do what I can to prolong doing this job again for as long as possible!

 

[Aidan Klimenko]

H55 into your truck? Not even a consideration

@Workhorse Do you mind epanding on this a bit? The shop that has the truck is suggesting the H55 swap as they say it's considerably stronger than the R15X and would be a much cheaper swap than the H150. Any insight on why not to would be great.

Thanks

 

[joekatana]

Just my 2 cents after driving 70 series for 3 decades and being around many of them . I personally prefer the R151 over the H55 because I feel it shifts smoother and the gearing is spread better . I never had a R151 go out not even on the 1HDT powered rock crawler I build on 40" tires , however I have known several R151's go boom usually being in heavily overloaded cruisers doing a lot of driving on bad roads , I feel that H55's would go out just as fast for these driving conditions and had a lot of H55's already in the past that needed rebuilding .

I have 2 R151's here at the shop and one of those is going to a good friend in California for his troopy but the other is available if you want to go the used route ? It came from a 30k mile sideswiped 2016 HZJ76 that I parted out many years ago and then I put it in my crawler and added approx another 2-3 k miles on it . I can sell this one or use it in my next build .

 

[bottombracket]

I daily drive a 74 series built by @rick_d. I am running a 1HDT with a G turbo, and R1 51 with a 300 mm 21 spline Exedy clutch. I have zero issues in my daily around town driving, though I don’t stop at Starbucks, Onur.

I have wheeled this truck and driven it off-road and would have zero hesitations to continue to do so.

I have personally watched Joe wheel his R151 in his 73 series buggy on 40s. That’s what convinced me that the R151 can handle itself just fine.

I have personally gone down the pathway of parts acquisition for the h152, converted three of them from 1VD to 1HD input shaft, and also done all the parts acquisition for the HF1a shifter. The easiest way to assemble one of those is to just get in touch with Stedman and tell him to use the HF1a shifter parts list that I have been using. He will hook you up and make it easy.

 

[SNLC]

Weld in trans hump is also different as is the OEM floor mat if it has one.

Cheers

 

[bottombracket]

1HD floor plate is NLA but I can confirm that the VDJ7x floor plate and floor mat is a fit.

 

[renago]

What I have learned from THE failure of my R151 gearbox is :
This specific gearbox with a standard HZ1 has been designed at its limit .
What kills gearboxes is not power but torque !
What kills this specific gearbox are not THE bad roads ,but THE highjway.
vibrations in 5 THE gear will affeci THE bearing housing , that will fail.
Normal life for an overland truck with this gearbox , aprox 100 k km .

 

[Eurasiaoverland]

If you end up replacing a stock transmission/driveline with mismatched stock and bespoke parts which someone has made for you in a workshop (e.g. clutch housings, extension hosuings) on the grounds that this is a safer bet in terms of reliability when travelling far from home than running a stock transmission (in good condition), and behind a stock 1HZ at that... that is not logical. Better use the stock transmission and rebuild with standard parts if/when necessary than risk getting stranded when a bespoke part breaks which only one person in the world knows how to make.

 

[renago]

If you end up replacing a stock transmission/driveline with mismatched stock and bespoke parts which someone has made for you in a workshop (e.g. clutch housings, extension hosuings) on the grounds that this is a safer bet in terms of reliability when travelling far from home than running a stock transmission (in good condition), and behind a stock 1HZ at that... that is not logical. Better use the stock transmission and rebuild with standard parts if/when necessary than risk getting stranded when a bespoke part breaks which only one person in the world knows how to make.

This is partially true , but the bespoke parts
Are very limited .
Specifically to the rear drive shaft , and cross member .
All other parts are stock , from a different VIN , but stock .
So you can buy spare parts any time from Toyota.
Of course you must keep the VIN separate for these parts .

 

[Eurasiaoverland]

This is partially true , but the bespoke parts
Are very limited .
Specifically to the rear drive shaft , and cross member .
All other parts are stock , from a different VIN , but stock .
So you can buy spare parts any time from Toyota.
Of course you must keep the VIN separate for these parts .

For the solution you have in mind, yes. But there have been other suggestions.
A general observation however.

 

[renago]

For the solution you have in mind, yes. But there have been other suggestions.
A general observation however.

In any case I agree that it is better to stick with Toyota original parts as much as possible .
Spare parts could become a nightmare.
More than they already are !