identifying a t50 gearbox

[l1ttle_d3vil]

i've got two t50 gearboxes, but I don't know what they are out of/what year they are etc. are there any numbers or anything on the housing which will tell me what year/model t50 it is?
or are the internals of ALL t50 boxes the same (carina and ae86)? (bearings the same, lenght/diameter of gears and shafts etc etc)

thanks.

[sk1dlet]

i don't know of ne markings that will tell u what it came from, but there is two different output splines they are the 20 spline and 22 spline the 22spline suposibly has bigger bearings

[l1ttle_d3vil]

yea forgot about the 20 and 22 spline, is everything else the same between a 20 and 22 spline t50?

how is the bearing bigger? width? over all diameter or what?

[KinLoud]

Count the output splines. The easiest way to tell without pulling them apart.
22 means that you have the later model T50 that came in the AE86 etc.
20 spline means you have earlier T50 most often found behind 2t powered cars like Ta60 celica or TE71 levin etc.
All the bearings in the 22 spline T50 are bigger that the 20 spline T50.
Only internal difference between 22 splines (or 20 splines) is the speedo drive ratio. This is because the T50 was coupled with various ratio diffs: 4.3:1 4.1:1 3.9:1
All this means is that you might have problems with your speedo reading correctly.
The gear ratios themselves are the same between 22 and 20 spline unless you have spent about 2k on a trd close ratio set.
NOTE - you cannot (without some serious machining) put a bellhousing designed for a 22 spline onto a 20 spline box (and vice versa). This is due to the bearings at the front of the box being located by the face of the bellhousing... bigger/smaller bearings won't be held in place properly and the shims won't fit either.

Ken
Ham
021 408 863

[l1ttle_d3vil]

NOTE - you cannot (without some serious machining) put a bellhousing designed for a 22 spline onto a 20 spline box (and vice versa). This is due to the bearings at the front of the box being located by the face of the bellhousing... bigger/smaller bearings won't be held in place properly and the shims won't fit either.

do you mean there would be movement between the bearing on the input shaft and the bellhousing?

reason I'm asking this is my "rebuilt" gearbox sh*t itself the other day for no reason. it did have a slight whine when it was idling and in 5th other than that it was fine. my problem was the first synchro cone on my input shaft has spun and worn down, hence the gearbox trying to select two gears at once (or something to that effect).

i had someone look at it and they think it looks like there was movement between my input shaft bearing and bellhousing, which allowed my synchro cone to have play and spin. make sense?

ive got a 20 spline box, and im pretty sure I got an ae86 bellhousing [thats what its got written on it anyway]. so is this what my problem would be? would it work if I machined up a shim or something to fit that bellhousing to my gearbox? (keeping in mind my dad is an engineer/welder/machinist so machining isnt an issue).

just as a side note - would it work if I swapped my input shaft with a 22 spline shaft and kept that bellhousing?

sidenote #2: i've got a spare t50 with 21 teeth on the input shaft. how is this possible? I thought it was only 20 or 22. i counted it again and again to make sure i wasn't wrong, and it was definitely 21.

[QikStarlie]

you should be counting the output shaft, not the input shaft. thats why

[l1ttle_d3vil]

oohhh rightio then...my gearbox has a 20 spline output shaft and my spare box has a 22 spline output.

so still seems like I got an older t50 with an ae86 bellhousing, which if I understand right would allow movement at the input shaft end - and hence my problem; correct?