t-90 overdrive any cars come with one???

was there any cars in the 50's or 60's that came with a t-90 3 speed with an overdrive installed on the back i was told maybe a studebaker or a rambler but nobody was for sure thanks for any info

 

quick glance at the 54-63 Chiltons book makes me think that Studebaker and Willys might have used them.

 

any idea how plentiful these o/d units are if you could mount one on the back of a t-90 out of an international scout

 

you may or may not be able to swap it on the other trans, the mainshaft (output shaft) would have to be changed in the transmission, and you may have to modify the case to get the reverse lockout to work....assuming the case has the same castings...but then again, the Scout uses a top shift, not side shift, so who knows!

 

The OD's in Scout's were attached to the Dana 18 transfer case. IIRC

 

t86 side shifters and t90 top shifters have the same shift geometry, you can swap them around, but there will be a difference in the lockouts for the OD. it is possible to run without the internal lockout rail but you MUST remember to pull the lockout cable every time you hit reverse, the linkages wont do it for you anymore

 

Jeep CJ's of that era came with a T90 3 speed. I am assuming that is the same as your Scout? Warn made an overdrive that bolted on the rear of the transfer case. I have one of those laying around.

Mike

 

i know about the warn/saturn o/d's i had one in my 66 scout but i want o/d in a 2wd so im looking to put an o/d from a stude or rambler on the back of a t-90 scout tranny last resort would be to run t-case and warn just not use the t-case but thanks for the response

 

what would happen if you didnt lock out the o/d when you went in reverse would it break the o/d unit or just be in higher gear ???

 

it would shatter the roller clutch in the OD unit if you tried to do that.
the OD unit you want is a B-W R10. there were many cars with t86/r10 combos but i am not sure of what ran t90

 

how interchangeble is the t-86 to a t-90 do the internals interchange or would a o/d off a t-86 fit a t-90

 

Ramblers ran the T-86 w/OD in 287 V-8 powered cars (and some HD optioned sixes) and a T-89 in 327 V-8 powered cars. Thsoe are non-synchro first/reverse trannys. Around 1967 they were replaced with the full synchro T-15 in V-8s.

Except for the input shaft the complete T-86 should bolt to the Scout bell, or the T-89. I don't know about input shaft length. Splines is unimportant, you can always use a Rambler clutch disk if the shaft length will work. You should be able to find a Rambler trans. It doesn't matter if it was for a torque tube car or not, there will just be a flange on the tailshaft for the tube -- seal is the same forthe driveshaft yoke. You'll need an open drive yoke though -- the TT yoke is short since it doesn't slip in and out of the trans while moving. A T-10 yoke is available and fits the T-89, I'm not sure about the T-86.

The OD units are all the same, but the ~1"thick adapter between the trans and Od are unique to each application. So is the output shaft of the trans, which has to fit into the OD similar to a transfer case. The OD unit has no front bearing -- the OD front bearing is the trans rear bearing.

I've seen one or two of the old BW OD units fitted with a machined front and a bearing holding a cut off trans output shaft. It was then mounted on its own crossmember with a slip joint between the standard trans output and the OD. A lot of machine work, but if you have a vertical mill and the know-how, not that hard. I don't!!