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Old 11-16-2015, 12:10 PM   #2
Front Range
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Join Date: Jun 2014
Location: Longmont, Colorado
Posts: 251
Re: 89 Suburban - leaking TH400 transmission

You could dry the outside and wipe it with grease/wax remover then slather on RTV but it might still leak. Could be the old connector has wear on the plastic body, weak retaining clips, or a crack. You may have the wrong o-ring on it, could have damaged the o-ring going in.....etc,etc

The correct way is always a time consuming PITA initially - but it usually fixes the problem. If it was my transmission I would drop the pan and replace that connector and o-ring with a brand new unit making sure the inside radius where the o-ring sits was very clean - before sticking the new piece back in. Then cross my fingers. A new connector will run you anywhere from 3 to 10 bucks online.

http://www.transmissionpartsusa.com/...rts_s/5750.htm

For what it's worth I had a similar issue with the shift rod seal on my TH-400. Pain in the damn ass to get under there again after dropping the pan trying to figure it out - but when all done the leak free garage floor was worth the frustration.
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