T90 transmission

evanso1975 · Post by **evanso1975** » Sun Jul 24, 2011 3:50 am

Looks like the gearbox out of my M38 started life in a civvy jeep (note the shift tower):

The date cast into the side is 17th December 1951, and it has T90A1 cast above the date. Apart from the shift tower, are there any other differences between this box and the M38 one? And will it work ok in my jeep (I'm guessing it will)? I'd like to use this transmission, as when I opened it up it has no wear on the gears at all.

Thanks in advance,
Owen.

oilleaker1 · Post by **oilleaker1** » Sun Jul 24, 2011 6:21 am

I've found that the civilian Jeeps didn't have the same shift tower rubber boot like the M38. They had a very bad habit of filling up with water when they sat outside because of it. What in the world kind of RF brake setup do you have in the picture???????? John

oilleaker1 · Post by **oilleaker1** » Sun Jul 24, 2011 6:23 am

In answer to your question, it will work fine in your Jeep, and with the rubber boot you have there in the picture, no one will see it. John

evanso1975 · Post by **evanso1975** » Sun Jul 24, 2011 8:41 am

Thanks for that, John

......

Post by **wesk** » Sun Jul 24, 2011 10:42 am

The rubber boot shown in the pic requires the use of the tranny cover with the four holes drilled and boot retainer bracket like any CJ and will then look not like an M38 but instead a CJ. The only way to have the M38 look on the tranny hump inside is to have the undrilled cover and the boot that is integral to the tranny top cover.

Does the shift lever pivot bolt on your transfer case in the pic have the M38 hex head or is it flush and retained by a spring pin (roll pin)? The M38 transfer shift lever pin was a large bolt. The civvy transfer used a flat pin reatined by the spring pin (roll pin).

evanso1975 · Post by **evanso1975** » Sun Jul 24, 2011 11:32 am

I didn't realise at the time, but the bottom of the boot was folded down on itself. It does look like the stock M38 boot, but it has a split in the side so I'll probably replace it anyway:

And this is a close-up of the transfer case lever pivot:

It has a square-head bolt on the side closest to the gear lever holding the pivot in place. It doesn't have the M38 setup.