Old Celica Transmissions Diagrams (T40, T50, W40, W50 & P51)

[river]

Hi,

Here's some diagrams of the T40, T50, W40, W50 and P51 gearboxes that adorned the Celicas and other Toyotas of the 1970s. Sorry if the pics are big, but I wanted them clear so you can see them properly.

T40 and T50 Transmission



T40 and T50 Clutch Housing & Transmission Case



T40 and T50 Extension Housing



W40 Transmission



W40 Extension Housing



W50 and P51 Transmission



W40, W50 & P51 Clutch Housing & Transmission Case



W50 and P51 Extension Housing


Hope the above are useful & enlightening to you.

seeyuzz
river

[Norbie]

Great stuff old man River, mucho rep for you!

[river]

Hi,

Thanks Norbie. I also got the diffs to put up. I know you get excited by diffs and things like that!

seeyuzz
river

[joecoolmk2]

brilliant riv, rep +

so the only difference between a P51 and a W50 is the gear ratio's?

[river]

Hi,

The ratios can be the same on the P51 and the W50 boxes. The P51 is a Porsche patented gearbox that uses C-bands instead of synchros. It was fitted to the early Toyota GT and GTV 18R-G powered vehicles, but in the late 70's (maybe when the RA40 came out, but I'll have to check that) the P51 was phased out and all GT/GTV 18R-G powered vehicles used the W50 gearbox.

The Porsches of the early 70s used C-bands, but were replaced by synchros by the mid 70s.

I'm not sure why the W50 and the P51 were used at the same time, except perhaps the P51 was regarded as being a stronger gearbox. Maybe by the late 70's Toyota decided the 18R-GU and 18R-GUE power output was within W50 limits... or maybe they strengthened the W50.. or maybe they thought it was pointless to have two 5-speed boxes when one box (with different ratios) would cover their range of vehicles. That's my nice way of saying "I dunno".

seeyuzz
river

[joecoolmk2]

do you reckon this was because of price to produce, maintainability, or reliabilty?

where did you find this info? this is great.

[river]

Hi,

I got stacks of Celica catalogs and factory manuals with exploded views of gearboxes, diffs, engines, full exterior/interior etc.. etc... even the various pin-striping and emblems and badges.

It's just a slow process to get them into a format where I can put them up here for you guys and gals to enjoy.

And it brings me joy that you all seem to appreciate it and that keeps me going. Also, maybe it can help someone keep their old classic on the road, which is indeed a good thing.

seeyuzz
river

[joecoolmk2]

ooh, do the pinstripres and emblems next pretty please!

[TA-022]

/me taps madly on mouse

"Download Download god nab it!"

big +REP!

[YelloRolla]

River,
I love the work that you have done here, this thread will get you about 2million rep.

Do you have any such info for the W55,57,58 gearboxes?

[river]

Hi,

River,
Do you have any such info for the W55,57,58 gearboxes?

I'll have a look, but most of my information relates to the 1st gen Celica stuff. I'll have a squizz through my stuff and see what I can find.

I'm currently going through my TA20, RA21, TA22, TA27 and RA25 stuff at the moment. I have similar stuff for RA23, RA28, RA29 and RA35 to get into to help the owners of those cars.

I also got the internal diagrams of the actual gearboxes, rather than just the cases. Anyone interested in seeing the guts of these things?

seeyuzz
river

[jeffro ra28]

hey river, really nice work here.
I also have alot of exlpoded veiws etc of the 1st gens on soft copy. I could probly post up watever else interests people.

[YelloRolla]

I also got the internal diagrams of the actual gearboxes, rather than just the cases. Anyone interested in seeing the guts of these things?

seeyuzz
river

I am interested more in the guts than anything else. So count 1 for a big YES.

[brett_celicacoupe]

why does the input spline in on the W50/40 diagram look so out of proportion

it appears to be sticking out further than the bellhousing.

+rep

[rollin_stock]

Awesome stuff mate! +rep for you!!!