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03-15-2014, 11:32 PM | #1 |
Registered User
Join Date: Feb 2014
Location: Urbana Illinois
Posts: 55
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1978 C10 305 5.0L Custom deluxe th350 transmission leak
My truck is leaking transmission fluid from the weep hole, what should I do? There has been a lot coming out of that hole, the seal on the tail housing is fine. Any ideas?
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03-16-2014, 09:19 AM | #2 |
State of Confusion!
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 47,216
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Re: 1978 C10 305 5.0L Custom deluxe th350 transmission leak
There is a seal inside of the transmission tail shaft that is probably worn out. There are different versions of T350, some didn't use a weep hole in the front yoke. When I changed transmissions in mine, I also changed to a none weep hole yoke.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
03-16-2014, 09:52 AM | #3 |
BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: 1978 C10 305 5.0L Custom deluxe th350 transmission leak
Welcome to the site. Is the seal new?
Here is info on the seal: http://www.73-87.com/7387garage/drivetrain/yokeleak.htm Check the vent line is clear. If the vent line is clogged, pressure builds up blowing out seals. |
03-16-2014, 07:17 PM | #4 |
Registered User
Join Date: Feb 2014
Location: Urbana Illinois
Posts: 55
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Re: 1978 C10 305 5.0L Custom deluxe th350 transmission leak
I noticed a little bit of leaking where the the tailshaft housing bolts on. I read and seen the article above about the cup and O ring. I've read that a l;ot of folk had no cup or O ring? Is that true? I've had my truck in the garage for the winter while trying to wire brush the rust off, so it has been sitting for a spell. I did install a new transmission mount, the old one was wore all the way down, so the new mount lifted the tail housing a couple of inches. I also found a website that offers a plug for that weep hole. I don't know about the vent or how to check it. Thank you, Al
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