73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: PatrickJ on September 29, 2010, 12:09:45 pm
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From my 78 GMC 2whl/dr Sierra, the trans is leaking, new seal, yoke is not wet, seems to be coming from inside the yoke and dripping out the universal joints. Prior to these photos I cleaned the area to make sure it was not migrating from around the seal, it is not.
Any ideas, it is the th350 automatic trans.
Thanks.
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get some white lithium grease inside the yoke and cover up the weep hole.
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You need a new O-ring. If you remove the driveshaft you'll see the o-ring
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Coolio. did not know there is an O ring in there. Of course there would be. Duh on me, The local repair shop did my seal and did not mention or check for an O ring and I had mentioned the leak, this is why I had the seal replaced.
Thanks,
now, what the bejeebers is a weep hole. and lithium grease is always a good thing but do not see how this would stop the leak. Interesting reply tho. Thanks but would love to know what you mean. :-)
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The weep hole is supposed to be there the vent the air from the plunging. http://www.73-87.com/7387garage/drivetrain/yokeleak.htm
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Great! Learn something new everyday. I have the 2-piece drive shaft, so that part of the shaft does not plunge on mine so I just put a dab of the white lithium inside the yoke to plug the hole. Nice to know how I should have fixed it in case I ever go back in there again.
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Called the local parts places, advanced, auto zone, they cant get part. But I have a few trannies I can take the end off and exchange I think. At least I know what the begeebers now.
Thanks for replies Gents
Patrick
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If you have an air tool/hoist or high pressure hydraulics repair shop local to you they most likely can match up
a new o-ring if you bring in the old one, and they might not even charge you for it.
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Any reputable parts store will have an O ring selection. Just have them match it up.
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Thanks again for the replies. Problem repaired due to your info. I did a quick fix and that entailed dropping the drive shaft, cleaning out the yoke, adding the grease and problem solved for now. When I have the time I will check further for the O ring etc.
I will have to lay the truck up while I get it out, take it for comparison and did not have the time or second ride at the time.
Here is a photo for those who like me had no idea what the weep hole was even though the name truly says it all.