tranny/tc probems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

lugnut · 10-20-2003, 10:11 AM

Is is possible for tranny fluid to enter the T/C? My tranny has been giving me problems lately and actually is out as we speak. I notice a leak from the T/C and thought I had a bad front output shaft seal. When I went to drain the fluid to replace the seal in the T/C the thing was overfull by almost two quarts-the leak that I thought was the front seal ended up being fluid pumping out the top of the breather tube on the T/C. The tranny was low almost the same amount so it has to have come from there...it is practically impossibe to overfill a T/C because once it starts coming out the top filler hole, its full. If tranny fluid did get in the T/C does that mean the front seal on the T/C is damaged or does the pressure just force it in or what? Any comments? GM Is installing a new tranny today for me. I installed a GM reman 10,000 miles ago and it has been junk ever since so GM is replacing it today for me, so they are aware of the T/C fluid situation as well-I just want a second opinion.

eaglelox · 10-21-2003, 07:59 AM

sounds like a bad seal. i cant think of a good way to overfill a t\c with out a bad being the culprit.

adot · 11-09-2003, 01:42 PM

Had the same problem. My problem was a bad front T/C seal. When my tranny would get hot the fluid would pass through the rear tranny shaft and leak into the T/C, then the T/C would build up pressure and shoot it out the vent tube. This is a very common problem. Replace the T/C seal and you should be good to go!

adot · 11-09-2003, 01:45 PM

BTW.. forgot to mention I burn't my tranny up because of this problem!

10-20-2003, 10:11 AM	#1
lugnut Registered User Join Date: Feb 2003 Location: Bismarck, ND Posts: 116	tranny/tc probems Is is possible for tranny fluid to enter the T/C? My tranny has been giving me problems lately and actually is out as we speak. I notice a leak from the T/C and thought I had a bad front output shaft seal. When I went to drain the fluid to replace the seal in the T/C the thing was overfull by almost two quarts-the leak that I thought was the front seal ended up being fluid pumping out the top of the breather tube on the T/C. The tranny was low almost the same amount so it has to have come from there...it is practically impossibe to overfill a T/C because once it starts coming out the top filler hole, its full. If tranny fluid did get in the T/C does that mean the front seal on the T/C is damaged or does the pressure just force it in or what? Any comments? GM Is installing a new tranny today for me. I installed a GM reman 10,000 miles ago and it has been junk ever since so GM is replacing it today for me, so they are aware of the T/C fluid situation as well-I just want a second opinion. __________________ 1967 Chevrolet 1/2 ton 4x4 1972 GMC 1/2 ton 4x4 2005 1500 4x4 Suburban 2004 GMC Envoy 4x4 (wife's)

10-21-2003, 07:59 AM	#2
eaglelox Member Dude Join Date: Aug 2003 Location: reno,nv,usa Posts: 191	sounds like a bad seal. i cant think of a good way to overfill a t\c with out a bad being the culprit. __________________ Steve 1978 K20 Burb, 4" lift, 33's, 350 Eaglelox@Hotmail.com

11-09-2003, 01:42 PM	#3
adot Registered User Join Date: Nov 2003 Location: Arizona Posts: 5	Had the same problem. My problem was a bad front T/C seal. When my tranny would get hot the fluid would pass through the rear tranny shaft and leak into the T/C, then the T/C would build up pressure and shoot it out the vent tube. This is a very common problem. Replace the T/C seal and you should be good to go! __________________ 1990 GMC SUBURBAN MSD 6A MSD DIST. HELIX TBI SPACER

11-09-2003, 01:45 PM	#4
adot Registered User Join Date: Nov 2003 Location: Arizona Posts: 5	BTW.. forgot to mention I burn't my tranny up because of this problem! __________________ 1990 GMC SUBURBAN MSD 6A MSD DIST. HELIX TBI SPACER



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