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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.

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.
Folks that throw dirt on you aren't always trying to hurt you, and folks that pull you out of a jam aren't always trying to help you.
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