New Guy: 1966 CJ-5 Questions

Hello Early CJ-5 Forum!

I have a 1966 CJ-5, 231/t86/d18, d27/d44.

Some Q's i've had about her, yet no one seems to be specifically geared towards early CJ5's.

1) I thought i had a T-90, but it says the t-90 only came w/ the 4 cyl, my tranny is a 3 speed, and i have to put it in second in order to enagage 1st or reverse w/o grinding............?????

2) I was told i have a 231 V6........its a 6 cyl w/ headmann headers, HEI distrib, Rochester DualJet Carb (2B), yeah......that's all i know.

3) My brake pedal has alot of side to side slop, seems the arm is moving on the pivot thing......is there a bushing that goes in there?

4) I'm having trouble understanding these early cj5's. i have an 81 that i know well..... exactly what is the Buick V6, is it Chevy or not? I read about engine swaps, and auto tranny swaps (which i wouldnt mind) but i'm just a little confused, especially considering that my Jeep was rebuilt by Diamond Tech school, so no factory harness, no factory body, not even a VIN tag anywhere..... non factory engine, no clue about anything else.

THANK YOU FOR ALL YOUR HELP EVERYONE!

Cam

 

You can do a search on the internet for Buick Casting number to help with confirming the 231 or not, you may also find it in the technical section. Your casting number should be located at the back of the block near the fire wall on top.

 

I also have a 66 with the V-6. Early on in my rebuild had trany trouble. Mine was a T-86 and had to rebuild it - but couldn't find another T-86 locally. I did find that T-90 gears fit in the 86 case, so I found a T-90 in good condition and swappped out the guts, runs great still. Note - this is a common swap and you need te verify the gears even if you ID the case as a T-86. pull the top of the trany and take a look - the T-86 gears were spiral cut, and the T-90 were straight. Both trans non-sync on 1st and rev - No Prob, just get good @ dbl clutching it, or use 2nd to stop gears when at a stop before going into 1 or R. Now that I got a warn OD I sometimes use N on the OD instead of the trans at a stop, and split 1st when moving thru parking lots i.e. - easier than going into 2nd and having to dbl clutch back down. The OD works like a syncroed gear box when shifting.

Also, I worked with Herm @ ATV (hermtheoverdriveguy.com) and a great help. I see on his page that he has rebuilt T-86s

 

Does the T-86 input shaft work with the T-90 gears. The standard T-90 input shaft is too short to work into the 225 isn't it?

 

AS I understand it, The only thing that can be shared between the T-86 and T-90 is the case and maybe part or all of the shift top. A T-86 can be rebuilt using all the gears from a T-90, but you cannot mix T-86 and T-90 gears in the same transmission. As mentioned above, a T-86 has bevel gears (not spiral) for all forward gears, and the T-90 has a straight-cut first gear.

There are three different T-90 input shafts; two of the same length with different tooth counts, and the long input shaft originally used for Utility vehicles (T-90J, IIRC). Most T-90 conversions (the Pinto engine is a notable exception) use the long input shaft. I would guess that the T-86 also has a long input shaft, like the T-90J.

 

With the tranny top/shifter off ...look down into the gearbox.
T-86

T-90

As you can see on the left side of the pics, the input shaft gears are cut on differant angles.

 

OZFin that answers my question. I know that both inputs were beveled but had no T86 to compare. Tnx. Walt.