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Leaky 350 transmission
#846809 Thu Apr 26 2012 03:36 PM
Joined: Apr 2001
Posts: 35
5
50jimmy Offline OP
Wrench Fetcher
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?

Re: Leaky 350 transmission
50jimmy #846814 Thu Apr 26 2012 03:45 PM
Joined: Feb 2004
Posts: 23,199
H
'Bolter
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


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Re: Leaky 350 transmission
Hotrod Lincoln #846817 Thu Apr 26 2012 03:56 PM
Joined: Dec 2009
Posts: 198
H
Shop Shark
Thanks Hotrod L. I have the same problem and appreciate the info.


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Re: Leaky 350 transmission
hankrags #846856 Thu Apr 26 2012 07:06 PM
Joined: Apr 2001
Posts: 35
5
50jimmy Offline OP
Wrench Fetcher
That is awesome info. I'm for the simple fix.


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