quick tranny question. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72superBB · 03-16-2004, 03:29 PM

My th400 looks like it is leaking where the gear shifter goes into the tranny. Is there a o-ring in there? If there is, how do I change that out? DO I have to drop the tranny pan or what?

Thanks guys.

72superBB · 03-16-2004, 04:02 PM

ttt

Woody · 03-16-2004, 04:51 PM

the bad news is yes you have to remove the pan, then the valve body before the shift lever shaft can be removed from the inside. Then you have a small seal (like a grease seal behind the wheel bearings) that you have to pull out from the outside with a hook or something. Then use a small socket to seat the new seal.

Might as well change fluid, filter, pan gasket, the O rings on the modulator & speedo cable, & install a shift kit(if you haven't yet) while you are in there.

Be REAL CAREFUL not to lose the little balls above the valve body.

03-16-2004, 03:29 PM	#1
72superBB Registered User Join Date: Nov 2003 Location: Mandan, ND Posts: 422	quick tranny question. My th400 looks like it is leaking where the gear shifter goes into the tranny. Is there a o-ring in there? If there is, how do I change that out? DO I have to drop the tranny pan or what? Thanks guys. __________________ Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB

03-16-2004, 04:02 PM	#2
72superBB Registered User Join Date: Nov 2003 Location: Mandan, ND Posts: 422	ttt __________________ Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB

03-16-2004, 04:51 PM	#3
Woody Registered User Join Date: Feb 2000 Location: Georgetown, KY, USA Posts: 631	the bad news is yes you have to remove the pan, then the valve body before the shift lever shaft can be removed from the inside. Then you have a small seal (like a grease seal behind the wheel bearings) that you have to pull out from the outside with a hook or something. Then use a small socket to seat the new seal. Might as well change fluid, filter, pan gasket, the O rings on the modulator & speedo cable, & install a shift kit(if you haven't yet) while you are in there. Be REAL CAREFUL not to lose the little balls above the valve body.



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