T-90/ T-14 interchangeability?

Having issues on the '71-ish w/ :v6: buildup...

Problem: Painted up & gave new seals, gaskets to a T-90, W/ single stick D18. Come to find that the cast-iron section that holds the parking brake lever has a broken tranny-mating flange. Can't use it, grrrr....

Possible solution: I just happen to have a spare T-14 w/ twin stick D18 with the same input shaft length & spline count. Considering swapping this whole shebang in.

I've searched for the last hour on this....hopefully that means that there "shouldn't" be any probs. Driveshaft yokes are same-same. Even the bell adaptor plate looks like it interchanges between the two, which I didn't expect. (bonus!)

Z'is sound ok to do? Or, any tips before I proceed down a potential path of doom? :twisted:

 

would swap parts around to fix the broken flange. much easier and cheaper as well.

 

Hippo,
The T86 on my 67 ate itself a couple of years ago and I bought a rebuilt long-shaft T14 from Herm and it fit right up with no problems to the original adapter. IIRC I did not have to move the crossmember back, but did have to drill new holes for the mount.

Hope this helps.
Rob

 

not much difference 1/2" or less in length. the t14 is a better trans with it's syncro'd 1st and rev (very handy on trail) than the t90. unsure if it has a lower 1st than the t90 or not thou.

 

Thanks for the tips gang. I'll choose the T14 because I won't have to take it apart; the syncro'ed 1st gear; and the reverse light switch. Yes, the shaft on the T-14 sticks out about 1/6" longer than the T-90. I'm crossing my fingers that it'll bolt up to the V6 w/ the T90 adaptor just fine.

But one dang prob....the lever on the x-fer case is pointed the wrong way. I've had a few levers that have the wrong bend to them. How to hook a parking brake cable up to a wrong-way lever? :?

 

The t14 and and t90 do not share the same bolt pattern for the bellhousing adapter, they are totally different.

 

Mike not sure what you mean. Both tranny-to-adapter bolt measurements are identical in height/width. :?

No matter anyhow tho! Holy cow, the x-fer case on the T14 has about 6 teeth broken off. It's back to the drawing board. I'll likely scavenge the middle iron section of the baddie x-fer case and slap it on the case that's on the T90.

 

They are on the bellhousing but the transmission side is totally different for the t14 compared to the t90, the t14 is almost a square pattern the t90 is not, the t86 is the same as the t14 though. These are the bolt pattern dimensions for the 3 transmissions,
T-86 bolt pattern 6.00 x 5.75
T-90 bolt pattern 6.25 x 4.125
T-14 bolt pattern 6.00 x 5.75

 

A Hahhh, figured out that I've got a T90 shifter on top of a T86 tranny. That's why I got the same measurements. I simply relied on the tower data. No wonder I was con-fussed!! Sorry Mike.

Now please tell me that the T90 tower will werk on this T86.

 

I'm doing this now for a friend, his t86 has a t90 tower on it also, the difference is the shift fork for the front syncro assembly, the t86 fork is much wider than the t90 is. From what I've seen the t86 always used the t90 top just had a different front shift fork.

 

So do I need to change out a shift fork, or are they purty much interchangeable as is despite the diffos?

 

Yes make sure the front shift fork matches the syncro assembly your using, T90 or t86.

 

Great info, thanks Mike.

I'm guessing a p.o. must've made the front fork switch to make it work...or else the thing wouldn't shift. (right? )