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Tractor Talk Discussion Board

Re: Rebuilding a modern automatic transmission 1st time?


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Posted by used red mn on July 03, 2020 at 20:53:12 from (75.73.112.20):

In Reply to: Rebuilding a modern automatic transmission 1st time? posted by Cariboo4x4 on July 03, 2020 at 16:30:46:

FIRST I will double second what David G said, doing your first AT in someone else’s vehicle without a seasoned
trans tech looking over your shoulder every step of the way has a very high probability of causing some friction
between you and the owner.
I have overhauled ATs and here is one caution which repeats what some others have said about being clean.
Wash parts in clean solvent and let them drip off then blow dry with compressed air. Do not wipe anything with a
cloth rag. I remember at one place I worked at a vehicle came in that had just had trans rebuilt at another shop,
don’t remember the why or what for. We pulled the pan off and the filter was a red fur ball from the previous
shops use of red rags. I cannot remember what the issue was because I was not the tech working on it. If you look a
a trans valve body there are probably 25 - 40 spool valves and these new models use aluminum valve bodies.
Very close tolerances, rag lint in those is no good. Sure the filter stopped it but you know there was some
floating around in there downstream of the filter from what they thought was diligent wiping.
A rear wheel drive trans will not be as bad as a front drive as they still use o-rings to seal everything. On the
front wheel drive trans the case sections are sealed with RTV so you have to be sparing with assembly lube so
there is not oil running on the sealing surface while assembling.
Lastly there are no ...over the shoulder.. parts or bolts in an AT. As someone else said you start with a clean
empty bench and if clutch plates are changed or a hard part is replaced have a secondary location to place
anything that comes out in an orderly fashion. When your done the bench is clean and empty so you know
everything is back in where it belongs. If there is any question you have those parts taken out to reference until it
is back in and functioning properly.
Yes you can probably do it. Is taking it on under the circumstances a wise choice in my humble opinion not
really.


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