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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Apr 2001 Posts: 35 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2001 Posts: 35 | When I let the truck sit a few days, I get a big puddle of ATF underneath. This is actually the second transmission I have had in the truck. Same problem.I have had the transmission out of it several times, quite frankly I would like to fix it once and for all. Is there something I am doing to cause this? Is there a common cure? | | | | | Joined: Feb 2004 Posts: 29,777 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,777 | That's a pretty common problem with the TH 350. The torque converter is draining back into the case, and raising the fluid level above the centerline of the driveshaft yoke. There's a tiny hole in the plug in the end of the yoke just ahead of the universal joint to prevent air pressure buildup as the yoke slides in and out. Fluid will leak out of the hole if the level gets too high. The simple fix is to pull the yoke off the U joint and weld up the hole. If you want to do it "right", drop the valve body off the transmission and find out why the converter anti-drainback valve isn't sealing. That's a BIG job with the transmission in the vehicle!
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Dec 2009 Posts: 194 Shop Shark | | Shop Shark Joined: Dec 2009 Posts: 194 | Thanks Hotrod L. I have the same problem and appreciate the info. | | | | | Joined: Apr 2001 Posts: 35 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2001 Posts: 35 | That is awesome info. I'm for the simple fix. | | |
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