Need help identifying tranny leak - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Mountain Man · 03-23-2003, 10:52 PM

Have some tranny fluid dripping on the garage floor. Changed pan and filter a week ago, as well as engine pan, in hopes of eliminating all leaks.

Still have tranny fluid, but not coming from pan.

Appears to be dripping from the area at the back of engine.

It is possible for a torque converter to leak, or do you think it is possibly an input shaft seal. Leak seems to trickle down by the flex plate area.

woodrow59 · 03-23-2003, 11:27 PM

Just a thought, have you checked the cooling lines to the radiator. Mine has a leak in the line right where it starts to come up to the radiator but the fluid goes back down the borrom of the line to make it look like the leak is coming from back there.

Again just something else to check out.

**COBALT** · 03-24-2003, 02:08 AM

Either the front seal or a leak around one of your front pump bolts. It can run over your torque converter, and when you fire up the truck the fluid gets flung all over the flex plate. You've obviously popped the inspection cover. What did the front of the pump look like? Front seal leaks are generally easy to identify.

Project1970 · 03-24-2003, 04:37 AM

What about the dipstick seal? That one was a MAJOR pain on my 700R4...

03-23-2003, 10:52 PM	#1
Mountain Man Registered User Join Date: Jan 2002 Location: Calgary, Alberta, Canada Posts: 451	Need help identifying tranny leak Have some tranny fluid dripping on the garage floor. Changed pan and filter a week ago, as well as engine pan, in hopes of eliminating all leaks. Still have tranny fluid, but not coming from pan. Appears to be dripping from the area at the back of engine. It is possible for a torque converter to leak, or do you think it is possibly an input shaft seal. Leak seems to trickle down by the flex plate area. __________________ 72 C10 Cheyenne Super Full trim Factory tach dash A/C dash Factory tilt 350 / 350 power train - with Edelbrock components.

03-23-2003, 11:27 PM	#2
woodrow59 OzarkHillbilly in Atlanta Join Date: May 2002 Location: Douglasville, Ga. Salem, Mo. Posts: 386	Just a thought, have you checked the cooling lines to the radiator. Mine has a leak in the line right where it starts to come up to the radiator but the fluid goes back down the borrom of the line to make it look like the leak is coming from back there. Again just something else to check out. __________________ 72 custom/10 LWB 68 Longhorn C20 Custom Camper (sold)

03-24-2003, 02:08 AM	#3
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	Either the front seal or a leak around one of your front pump bolts. It can run over your torque converter, and when you fire up the truck the fluid gets flung all over the flex plate. You've obviously popped the inspection cover. What did the front of the pump look like? Front seal leaks are generally easy to identify. __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

03-24-2003, 04:37 AM	#4
Project1970 14.1 @ 96MPH Join Date: Jul 2001 Location: Mesa, AZ Posts: 2,811	What about the dipstick seal? That one was a MAJOR pain on my 700R4... __________________ Project1970 - LS1 Swap Complete!

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