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Transmission T90

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BavWilly View Drop Down
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    Posted: 08 Dec. 2022 at 4:33am
Hello,

Going downhill in 2nd on „engine brake“, after a couple of seconds the gear pops out. No issues otherwise, other than numerous leaks around tranny and transfer case. Some of these leaks probably coming from the shifter cover.

Reading all the trouble about pulling tranny/transfer off the engine makes me kind of freaking out a bit. 
 Do you guys think it’s already worth rebuilding the tranny?

Thanks
Klaus
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nofender Quote  Post ReplyReply Direct Link To This Post Posted: 08 Dec. 2022 at 5:27am
Popping out of second gear usually indicates the syncros are worn - which does mean a rebuild may be in order. 

But don't freak out! These are simple vehicles that are great to learn on! I'm sure the group here will give you plenty of good advice. 

If you don't have one - get a quality manual and get familiar with what you may be facing. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jeff J Quote  Post ReplyReply Direct Link To This Post Posted: 08 Dec. 2022 at 9:29am
It could also be the poppet ball and/or spring on the shift rail. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Joe DeYoung Quote  Post ReplyReply Direct Link To This Post Posted: 08 Dec. 2022 at 9:43am
Other possible causes can be excessive main shaft end play or shift forks loose on shift tower rails.

Loose forks are from the hollow pin collapsing. It's a simple fix that doesn't require removal of the trans/transfer. Remove the shift tower, grind off the swagged hollow pin head, punch out the hollow pin, install a roll/spring pin in its place. Roll pins can be bought at your local hardware store. 

If that doesn't fix it, then you're looking at a rebuild. Like Andy said, with a manual and some time/effort you can do this job yourself. The T90 is a very simple transmission and there are lots of great resources to help you... this forum, Youtube, ect.      


Edited by Joe DeYoung - 08 Dec. 2022 at 9:52am
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to many jeeps, parts, and accessories to list here, but apparently enough to keep me in trouble with my wife.





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BavWilly View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BavWilly Quote  Post ReplyReply Direct Link To This Post Posted: 08 Dec. 2022 at 9:45am
Maybe worth to check the shifter tower first, then.
Can I simply pull the tower and check/refurbish it w/o messing up the transmission?
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Yes you can
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Post Options Post Options   Thanks (0) Thanks(0)   Quote WellFedHobo Quote  Post ReplyReply Direct Link To This Post Posted: 08 Dec. 2022 at 11:41am
Rick Stivers on YouTube has a simple shift tower adjustment video that might help with the popping out of second gear issue, but it is likely that the synchros are worn. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom in RI Quote  Post ReplyReply Direct Link To This Post Posted: 08 Dec. 2022 at 3:20pm
In addition to the Stivers rebuild guide there is a video on the Novak Adapters under the rebuilding T-90 section that goes into the shifter/tower rebuild.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 47 deuce alpha Quote  Post ReplyReply Direct Link To This Post Posted: 09 Dec. 2022 at 12:47pm

Here is the service bulletin from 1949 concerning second gear problems. Rick Stivers has a good youtube on how to shim your transmission.     
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BavWilly Quote  Post ReplyReply Direct Link To This Post Posted: 20 Dec. 2022 at 7:14am
Hello,

What is the size of the roll pins which hold the shifter forks in the rail (in the T90 shifter tower)?

Thanks
Klaus
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Triton28 Quote  Post ReplyReply Direct Link To This Post Posted: 20 Dec. 2022 at 9:19pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BavWilly Quote  Post ReplyReply Direct Link To This Post Posted: 26 Dec. 2022 at 8:05am
It’s seems next to impossible to find these roll pins, which hold the shift fork to the rail. At least over here in Europe. Metric doesn’t seem to work.
Any ideas for options?

Best regards and merry Christmas
Klaus
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TERRY Quote  Post ReplyReply Direct Link To This Post Posted: 26 Dec. 2022 at 10:57am
Suppose you could enlarge the holes a bit if needed.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jeepsterjim Quote  Post ReplyReply Direct Link To This Post Posted: 26 Dec. 2022 at 11:32am
Might be nice to upgrade to a T90C trans....just a few parts need to be swapped out to do so.
Jim
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