Re: [AMC-list] overdrive issues

[Frank Swygert <farna@xxxxxxx>]

I've rebuilt a couple. Howling is probably in the planetary gear set. I think there are only three planetaries, but they are on small shafts. The shafts can wear, making the gears loose. If one of those shafts break you'll think someone fired a shotgun under the floor, but don't panic, everything is okay! You won't even be stranded! The loose planetary will just jam the sun gear to the drum gear. No OD or free-wheeling anymore, everything will be bound together in the OD unit. I had that happen once... and that's enough! 

Luckily you have a spare -- the OD unit should be identical on the T-85/89 as on the T-96, just the adapter between the trans and OD case is different. Could be a different spline on the trans output shaft, but I don't think so. All the R-10 OD units are supposedly the same regardless of application, the only difference is the adapter and the wiring circuits used for control. 

If you decide to tackle it, make sure you have a large pan or something under the OD when you pull the main case back. A lot of rollers will fall out! Putting it back on is easy, stick the rollers in the carrier with axle grease or vaseline, and stick a rubber band around them. Grease/vaseline dissolves, rubber band chews up and dissolves also. That's the only hard part. 

There are only two bearings, one on the output shaft and one in the adapter. When you pull the case off the output shaft comes with it. You'll just have to pull it apart and inspect it. The planetaries should spin easily but not be real loose on the shafts. Chips in gears will be evident. The big drum gear comes off the output shaft. If nwparts.com can't get something let me know. There's a manual trans rebuilder in Greenville, SC, that got all new parts for one I had rebuilt a few years ago. As Tom said, "it ain't cheap" -- cost me $800 for a complete rebuild, but that included labor and they replaced the trans input shaft. It was a T-96J, which is rather rare (only used by AMC, and only a couple years). A standard T-96 should be relatively common as far as antique trannys go. I had it professionally rebuilt because I was going to try it behind a 4.0L EFI engine. Worked fine, except it ate the synchronizer within 50-60 miles even taking it easy. Double clutched on downshifts
 for two years before I started getting concerned. 20K miles looked like 50-60K on the gears when I replaced it. Still have it, needs a synchronizer kit! 

--------
Date: 22 Jun 2009 04:41:52 -0000
From: das24rules@xxxxxxxxx
Subject: [AMC-list] overdrive issues

i have a small at the moment, but i think soon to be BIG issue with my
overdrive. well, i think its from the overdrive. started out just fine,
lastnight it started to howl a little. 
is anyone making rebuild stuff for these old o/d? how hard are they to
rebuild. there is a section in my tsm that goes over it, but anyone have
experience rebuilding it? im thinking it has a bearing going out. what about
this other o/d i have on a another transmission? i forget if it is a t89 or
85. have to go look. i was told that o/d and trans both were rebuilt and
never installed. i just have them sitting on a shelf in my shop. can it be
swapped onto the t96 without a lot of hassle? 

--
Frank Swygert
Publisher, "American Motors Cars" 
Magazine (AMC)
For all AMC enthusiasts
http://farna.home.att.net/AMC.html
(free download available!)


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