Manual swap on an 80. Opinion on performance needed!!!

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Delancy said:
I have two sitting side by side and there's no difference in clutch or input shaft.

Are you saying the gear itself is somehow weaker on the H150F?
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The h151 has a larger diameter input shaft and allows for a a larger clutch. 150 runs a 275mm clutch, the 151 runs a 300mm clutch.

Manual Gearbox; 5-speed manual the model designation is H150F.

The gear ratios are: 1st 4.529:1, 2nd 2.464:1, 3rd 1.49:1, 4th 1:1, 5th .881:1, reverse 4.313:1
Size, Spline OD & No. of Teeth 275 x 29.7 x 21

Manual Gearbox; 5-speed manual the model designation is H151F.

The gear ratios are: 1st 4.081:1, 2nd 2.294:1, 3rd 1.49:1, 4th 1:1, 5th .881:1, reverse 4.313:1
Size, Spline OD & No. of Teeth 300 x 32.4 x 14
 
@Delancy any of those H transmission for sale? I'm in joblin mo now and will pass though maybe Sunday on the way back to Dallas
 
I know someone that did a 92 and claims more power and better fuel economy. He used an FJ60 for donor...
 
Johnny Ngo said:
It's an H55?
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No idea, I don't know the transmission models out of the 60s. I know is a 4 speed. He used the bellhousing, transmission and transfer case of a 60. He had to modify the driveshafts also.
 
I swapped my A442F for an h151f and went through the trouble of doing it 99% factory.

Yes it is very expensive and you will find you will be spending lots of cash in shipping if you don't get your parts down the first time.

As for performance you will see a difference. Overall "speed" is about the same because of time taken shifting as The H151 has large throws. However your throttle response is night and day and city driving is a joy as you need barely any skinny pedal to hold speed instead of always spooling the torque converter.

As for fuel economy, reports state differences between diesel and gas. My diesel gets almost 4 mpg better efficiency in the city however highway is the same. On a 1FZ you will see around 2 mpg increase. Also remember your highway RPM will increase quite a bit - 2450 RPM @ 100 km/h in 5th. It's the only downside.

An added bonus is low range gearing as the manual gives you far better performance instead of being "between gears" with the auto off-road. The thing crawls very slowly in 1st and 2nd low with the factory auto t case.
 
serenity said:
The h151 has a larger diameter input shaft and allows for a a larger clutch. 150 runs a 275mm clutch, the 151 runs a 300mm clutch.
Click to expand...
While this is technically correct, it only applies to the H150f trans out of a 1hz 80 series. The H150f out of the factory turbo 78 and 79 series has the larger 300mm clutch and larger coarse spline input shaft.
 
Locked79 said:
While this is technically correct, it only applies to the H150f trans out of a 1hz 80 series. The H150f out of the factory turbo 78 and 79 series has the larger 300mm clutch and larger coarse spline input shaft.
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Just did a quick search, I don't know much about the 70 series lineup. Looks like Toyota used the input shaft and clutch of the 151 with the ratios of a 150 in the later boxes, called it a H150f and ditched the 151 from the lineup. Also looks as though they changed the location of the gear lever to improve shifting.

Delancy said:
I have two sitting side by side and there's no difference in clutch or input shaft.

Are you saying the gear itself is somehow weaker on the H150F?
Click to expand...

So I'm guessing if you have a 150 and 151 sitting side by side and they look the same the. You have a 151 from an 80 and a post upgrade 150 from a later model 70 series.

I love learning new things.
 
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serenity said:
Looks like Toyota used the input shaft and clutch of the 151 with the ratios of a 150 in the later boxes, called it a H150f and ditched the 151 from the lineup.
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Well kind of. The hdj78/79 ran the H150f up till 06. The fzj78/79 and hdj100 ran the H151f up till 06 also so they were produced side by side. Current model vdj76/78/79 still run the H150f with a longer input shaft and bell housing. The H151f has been absent in the AU market since 07 but may still be available behind the GCC spec manual vdj200.
 
gnarlynick2072 said:
I swapped my A442F for an h151f and went through the trouble of doing it 99% factory.

Yes it is very expensive and you will find you will be spending lots of cash in shipping if you don't get your parts down the first time.

As for performance you will see a difference. Overall "speed" is about the same because of time taken shifting as The H151 has large throws. However your throttle response is night and day and city driving is a joy as you need barely any skinny pedal to hold speed instead of always spooling the torque converter.

As for fuel economy, reports state differences between diesel and gas. My diesel gets almost 4 mpg better efficiency in the city however highway is the same. On a 1FZ you will see around 2 mpg increase. Also remember your highway RPM will increase quite a bit - 2450 RPM @ 100 km/h in 5th. It's the only downside.

An added bonus is low range gearing as the manual gives you far better performance instead of being "between gears" with the auto off-road. The thing crawls very slowly in 1st and 2nd low with the factory auto t case.
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oh god i want one so bad...

you've described pretty much every gripe i have about my 80 as it sits...
 
This thread may help
Computer Problems with Manual Trans Swap

You could go the next step and just replace the ECU with one from a later model Vortec, of course you'd have to replace the engine with a Vortec and then bolt up an NV4500 :)

Good luck with it and post up what you come up with.
 
serenity said:
So I'm guessing if you have a 150 and 151 sitting side by side and they look the same the. You have a 151 from an 80 and a post upgrade 150 from a later model 70 series.
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Both from FZJ75s, one a '95 and one a '96-'97.

That said, all FZ/HD H15Xs utilize the same 300mm clutch and same 19 spline input shaft.

It'd be interesting to see how the HZJ80 was configured, but thought it was the same as the HD, from clutch/input perspective.

Johnny Ngo said:
@Delancy any of those H transmission for sale?
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No, sir.
 
Delancy said:
Both from FZJ75s, one a '95 and one a '96-'97.

That said, all FZ/HD H15Xs utilize the same 300mm clutch and same 19 spline input shaft.

It'd be interesting to see how the HZJ80 was configured, but thought it was the same as the HD, from clutch/input perspective.



No, sir.
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Have a look through the exedy clutch catalogues. No mention of a 19 spline at all for the 7x or 80 series. It's either 14 or 21 splines, they also spec a 275mm clutch for the fzj75 but a 300mm for the fzj80.

For that year 75 series you should have a 14 spline 32mm OD input with 275mm clutch.
If you have 19 spline inputs then you haven't got a h15X.

All hzj80s had the early h150 with 21 spline input and 275mm clutch.
Hdj80s and fzj80s had the h151 with 14 spline input and 300mm clutch.
 
R151's from toyota pickups and 4runners only came behind the 22rte (turbo motor). Are you sure you aren't thinking of a r150?
 
Johnny Ngo said:
Is throw as large as the NV4500?
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Never driven an NV4500 so I couldn't tell ya.

For all the guys that want to solve the ECU issues good friggin luck. LHD EFI manual trucks are generally found in the GCC and South America and have fun finding anything out of either of those.
 
serenity said:
It's either 14 or 21 splines....
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14 is what I meant to say.

Didn't realize the HZJ80s were a 21 spline input, which opens up a whole new can of worms, considering the musical drivetrain component play currently shuffling to an odd beat here.

Begs this pondering:

Suppose the 21 spline input from the HZJ80 H150F will swap with the that of a 14 spline H15X?

Mudder said:
R151's from toyota pickups and 4runners only came behind the 22rte (turbo motor). Are you sure you aren't thinking of a r150?
Click to expand...

R151Fs with either BF1A split cases or HF1As are also used behind 1HZs, to date, in HZJ7Xs.

They're a little different than the mini equivalent, but essentially the same.
 
Delancy said:
14 is what I meant to say.

Didn't realize the HZJ80s were a 21 spline input, which opens up a whole new can of worms, considering the musical drivetrain component play currently shuffling to an odd beat here.

Begs this pondering:

Suppose the 21 spline input from the HZJ80 H150F will swap with the that of a 14 spline H15X?
Click to expand...

Yeah God knows why Toyota didn't just run the same spline count and clutch on all the h15x series boxes. Would have made life easier.

No first hand experience of swapping inputs to get a low geared box with the bigger input but I have heard it is possible. With the later 150 having the larger input I would guess that it would be an option to modify your boxes.

I'd love to swap my 150 for a 151, the low 1st and 2nd gears suck for around town use, especially now that I have a turbo. Been tempted to get a set of 3.7 gears instead though to drop revs through the whole range.
 
Thank you @Delancy I didn't realise that Toyota used them on other vehicles.
 
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