Transfercase over pressuring from tranny - The 1947 - Present Chevrolet & GMC Truck Message Board Network

drink2mny · 11-16-2003, 08:13 PM

Well I took the blazer for a drive to clean her out

.
when I got back home I started to get a puddle underneath her..
I looked all over at everything and saw the vent tube wet on my transfercase..
When I opened up the fill hole fluid just pressured right out and my tranny was at the add mark..My tranny doesn't leak..

Does this sound like the seal went bad..
Thats my best guess, so I dropped it and took a look at the seal. It looks ok but now thats its down I think I still will replace it..
I probably just answered my own question.
Oh well

**Stocker** · 11-16-2003, 11:35 PM

Yup, gotta be the seal. Mine went bad once - I didn't notice any pressure in the t-case, but the tranny kept losing fluid (with no visible leaks) and the t-case kept filling up with tranny fluid!

ozarkhippie · 11-16-2003, 11:37 PM

check and be sure the vent tube is not pluged on the tranny

cheyenne10 · 11-17-2003, 12:47 AM

Should be bad seal(s) in adapter between trans and transfer case. I had this happen and had smoke screen behind me from fluid burning off exhaust. Whole underside of truck was coverd with fluid. had shop put new seals in adapter and all better.

teamroper! · 11-17-2003, 03:41 PM

Be sure to use an genuine gm seal because several years ago I had the same problem and used aftermarket seals they would hold only for about a month then leak again solved the problem by going with genuine gm!

11-16-2003, 08:13 PM	#1
drink2mny Registered User Join Date: Jun 2003 Location: spokane wa Posts: 2,189	Transfercase over pressuring from tranny Well I took the blazer for a drive to clean her out . when I got back home I started to get a puddle underneath her.. I looked all over at everything and saw the vent tube wet on my transfercase.. When I opened up the fill hole fluid just pressured right out and my tranny was at the add mark..My tranny doesn't leak.. Does this sound like the seal went bad.. Thats my best guess, so I dropped it and took a look at the seal. It looks ok but now thats its down I think I still will replace it.. I probably just answered my own question. Oh well __________________ Support The Board

11-16-2003, 11:35 PM	#2
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,728	Yup, gotta be the seal. Mine went bad once - I didn't notice any pressure in the t-case, but the tranny kept losing fluid (with no visible leaks) and the t-case kept filling up with tranny fluid! __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

11-16-2003, 11:37 PM	#3
ozarkhippie Registered User Join Date: Nov 2002 Location: Eureka Springs AR Posts: 494	check and be sure the vent tube is not pluged on the tranny __________________ Buy Sale or Trade 71 3/4 4x4 72 1/2 ton cheyenne 4x4

11-17-2003, 12:47 AM	#4
cheyenne10 Senior Member Join Date: Apr 2000 Location: Oregon Posts: 2,512	trans adapter Should be bad seal(s) in adapter between trans and transfer case. I had this happen and had smoke screen behind me from fluid burning off exhaust. Whole underside of truck was coverd with fluid. had shop put new seals in adapter and all better. __________________ Bob

11-17-2003, 03:41 PM	#5
teamroper! Registered User Join Date: Nov 2003 Location: northeast alabama Posts: 258	Be sure to use an genuine gm seal because several years ago I had the same problem and used aftermarket seals they would hold only for about a month then leak again solved the problem by going with genuine gm!



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