Trans Fluid - leaking down front driveshaft - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**lks dcvn** · 04-27-2009, 10:36 AM

Got some time to move some stuff around in the garage last weekend...

I was sweeping some leaves and spotted a few drips of what appeared to be trans fluid spots under the front driveshaft - I put a small bucket under it and in the past week it has put a layer of fluid in the bottom of the bucket.

Any idea what this is - and could it be from just sitting all winter?

I can get a pic when I get home if that helps...

bouncytruck · 04-27-2009, 10:51 AM

The seals in the transmission have probably dried up from sitting. I've heard it is a common problem with the older transmissions.

cparman · 04-27-2009, 05:25 PM

most of the transmission fluid in any automatic is stored in the torque converter. If you Blazer has been sitting for a long time, the converter could have drained some of the fluid into the body of the transmission. There isn't much room in the trans body, so it has to go somewhere. There is a vent on top of the body of the trans, but most all of the seals can weep some fluid. I would suggest you fire that old girl up and run it down the road. Wash off the trans, and see if the leaks come back.

**lks dcvn** · 04-27-2009, 06:14 PM

Sounds like a plan to me...

Musclerodz · 04-28-2009, 12:35 AM

yoke seal bad

**FRENCHBLUE72** · 05-01-2009, 09:49 PM

Mine does the same thing and its the front yoke seal also...

Long Roof · 05-01-2009, 10:59 PM

My trans did the same thing this winter. It was down about three quarts. My rubber trans gasket leaked. When the Jimmy sits for a long time the converter drains down and pushes out the trans pan gasket. Normally fine if I run it a couple times a week. Just so happens that it leaks in the passanger front corner and drips onto the front shaft. I keep a drain pan under the shaft just for this reason.

**Classic Heartbeat** · 05-02-2009, 11:56 AM

If the transmission fluid is coming out from around the seal on the transfer case, then you have two problems. The transfer case is supposed to be full of 90wt. Gear Oil. What this means if the fluid is running down the driveline coming from the transfer case, you have a bad tranny to transfercase adapter seal and front yoke seal in the transfer case.
A quick way to see if this is your problem, pull the transfer case fill plug. That plug sits lower than the transmission and either mixed gear oil and tranny fluid will come out or strait transmission fluid. WES

**jamie72** · 05-02-2009, 09:14 PM

Quote:

Originally Posted by Classic Heartbeat

If the transmission fluid is coming out from around the seal on the transfer case, then you have two problems. The transfer case is supposed to be full of 90wt. Gear Oil. What this means if the fluid is running down the driveline coming from the transfer case, you have a bad tranny to transfercase adapter seal and front yoke seal in the transfer case.
A quick way to see if this is your problem, pull the transfer case fill plug. That plug sits lower than the transmission and either mixed gear oil and tranny fluid will come out or strait transmission fluid. WES

i think he has a 203 xcase in his blazer..

bouncytruck · 05-02-2009, 10:03 PM

His truck has a 350/TH350?NP203 combo. The transmission was completely rebuilt right before he bought it.

04-27-2009, 10:36 AM	#1
lks dcvn Registered User Join Date: Jan 2007 Location: Columbus, Ohio Posts: 4,339	Trans Fluid - leaking down front driveshaft Got some time to move some stuff around in the garage last weekend... I was sweeping some leaves and spotted a few drips of what appeared to be trans fluid spots under the front driveshaft - I put a small bucket under it and in the past week it has put a layer of fluid in the bottom of the bucket. Any idea what this is - and could it be from just sitting all winter? I can get a pic when I get home if that helps...

04-27-2009, 10:51 AM	#2
bouncytruck SKINNY TIRES RULE! Join Date: Sep 2001 Location: Bothell, WA Posts: 11,049	Re: Trans Fluid - leaking down front driveshaft The seals in the transmission have probably dried up from sitting. I've heard it is a common problem with the older transmissions. __________________ bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L

04-27-2009, 05:25 PM	#3
cparman sharp as a marble Join Date: Jan 2007 Location: atlantic beach,florida Posts: 1,082	Re: Trans Fluid - leaking down front driveshaft most of the transmission fluid in any automatic is stored in the torque converter. If you Blazer has been sitting for a long time, the converter could have drained some of the fluid into the body of the transmission. There isn't much room in the trans body, so it has to go somewhere. There is a vent on top of the body of the trans, but most all of the seals can weep some fluid. I would suggest you fire that old girl up and run it down the road. Wash off the trans, and see if the leaks come back.

04-27-2009, 06:14 PM	#4
lks dcvn Registered User Join Date: Jan 2007 Location: Columbus, Ohio Posts: 4,339	Re: Trans Fluid - leaking down front driveshaft Sounds like a plan to me...

04-28-2009, 12:35 AM	#5
Musclerodz Senior Member Join Date: Aug 2005 Location: OKC, OK Posts: 2,365	Re: Trans Fluid - leaking down front driveshaft yoke seal bad __________________ Mike Redpath

05-01-2009, 09:49 PM	#6
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,601	Re: Trans Fluid - leaking down front driveshaft Mine does the same thing and its the front yoke seal also... __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

05-01-2009, 10:59 PM	#7
Long Roof Old School, New Style Join Date: Jun 2005 Location: Monroeville, Ohio Posts: 790	Re: Trans Fluid - leaking down front driveshaft My trans did the same thing this winter. It was down about three quarts. My rubber trans gasket leaked. When the Jimmy sits for a long time the converter drains down and pushes out the trans pan gasket. Normally fine if I run it a couple times a week. Just so happens that it leaks in the passanger front corner and drips onto the front shaft. I keep a drain pan under the shaft just for this reason. __________________ The Good: - 72 GMC Jimmy 4x4 - 307 cid / 350 th - 70 Chevy Suburban 1/2T 2wd - 454 cid /400 th - 96 Chevy Impala SS - mainly stock - 98 Chevy Tahoe LT 4x4 - all stock The Bad: - 86 Chevy Suburban 1/2T 4x4 - winter beater The Ugly: - 72 Chevy Suburban 1/2T 2wd - parts truck

05-02-2009, 11:56 AM	#8
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,770	Re: Trans Fluid - leaking down front driveshaft If the transmission fluid is coming out from around the seal on the transfer case, then you have two problems. The transfer case is supposed to be full of 90wt. Gear Oil. What this means if the fluid is running down the driveline coming from the transfer case, you have a bad tranny to transfercase adapter seal and front yoke seal in the transfer case. A quick way to see if this is your problem, pull the transfer case fill plug. That plug sits lower than the transmission and either mixed gear oil and tranny fluid will come out or strait transmission fluid. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

05-02-2009, 10:03 PM	#10
bouncytruck SKINNY TIRES RULE! Join Date: Sep 2001 Location: Bothell, WA Posts: 11,049	Re: Trans Fluid - leaking down front driveshaft His truck has a 350/TH350?NP203 combo. The transmission was completely rebuilt right before he bought it. __________________ bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L



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