T86 internals in a T90 case

Like the title says. Can it be done? I know it usually goes the other way around (T90 in a T86 case), but a forum member here has a T90 that's junk internally, and I have the T86 out of my 66, that's in pretty good shape, and they wanted to know if it could be done. I am not sure myself, so I thought I would ask the experts. :smash:

I am assuming the T86 case is only good for large hole D18's :?

 

You can put the guts from your T-90 into the T-86 case; the gear dimensions are the same. This may or may not work with the early D18.

quoted from another post. see thread dauntless bell housing. tim posted it. I would think it should work

 

I actually wanted to know if it could go the other way though
T86 gears in T90 case.

 

You should be able too. There is one shifter fork that must be changed as well. I forget which one though.
The T-86 uses a rear bearing retainer that can be removed and the T-90 plate can be installed in it's place. This means you can make a T-90 bolt up to a large hole case by using the T-86 rear bearing retainer or make a T-86 bolt up to a small hole case by using the T-90 rear bearing plate.

 

Anybody done a writeup on putting T90 internals in a T86 case?

 

I am thinking that i have done it before, on a friends jeep. but i cant remember if it was t86 guts in the t90 housing or the other way around. he had the whole rear of the tub full of transmissions and parts, and i built him a transmission. but for the life of me i cant say for sure

 

Also remember the input shaft on the T-86 is longer than the T-90.

 

Thanks Nick

So maybe different adapters on bellhousing?

Thanks everyone. Sounds like it can be done most likely. I'll get a hold of this person and see if they still want it. Otherwise I'll just sell it for what it is.