The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - TH 400 Torque Converter Drain Back Solutions?

ltitsnw · 11-15-2008, 02:26 PM

I had the same issues with a turbo 350. I was sure it was leaking from the dipstick tube, got that fixed and sure enough started leaking again. Talked with a buddy(former GM tech) told me look at the seal on the shifter shaft. Small seal,very small, designed like an axle seal. Cost about $2-3 dollors. Put that in and I haven't had anymore leaks. Even if it is draining back, it's along way up to the vent tube. Trans should hold all the fluid, only a few places it could get out. If it's not the tube, I'll bet on the shifter shaft seal....Troy

11-15-2008, 02:26 PM	#16
ltitsnw Registered User Join Date: Dec 2003 Location: Central Iowa Posts: 119	Re: TH 400 Torque Converter Drain Back Solutions? I had the same issues with a turbo 350. I was sure it was leaking from the dipstick tube, got that fixed and sure enough started leaking again. Talked with a buddy(former GM tech) told me look at the seal on the shifter shaft. Small seal,very small, designed like an axle seal. Cost about $2-3 dollors. Put that in and I haven't had anymore leaks. Even if it is draining back, it's along way up to the vent tube. Trans should hold all the fluid, only a few places it could get out. If it's not the tube, I'll bet on the shifter shaft seal....Troy __________________ 72 2wd Short Super-almost ready to start on it 95 S10 ZR2-not sure why it followed me home 02 3/4 2wd reg cab-work truck, possible 6.0L donor 06 4x crew-kid hauler, snow chaser