TH350 Front Seal - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Chevyguy111786 · 12-06-2003, 02:52 AM

My th350 is leakin and i believe it's the front seal. How hard is this to do? Would it be better to take it in? how much would it cost if i did it or if a mechanic did it? thanks, sorry for all the questions. Cory

Tx Firefighter · 12-06-2003, 02:57 AM

You have to pull the tranny and remove the torque converter. After all of that, the seal is very easy to change.

It's a chore if you don't have a lift.

walker · 12-06-2003, 02:57 AM

As I recall it was not difficult. $2 part. Hardest part is dropping the tranny. I am not a transmission expert but you might consider buying a transmission rebuild book to help you determine if you have other worn parts that are causing the seal to leak.

DanoDMano · 12-06-2003, 03:04 AM

I just did mine, and like they say you will need to drop the tranny and remove the torque convertor. I replaced the convertor at the same time with one with a higher stall.

dropping the tranny is easy, but reinstalling is a little tricky when it come to lining the spline up on the convertor to the motor.

I puled my tranny with my motor so it was alot easier!!

krue · 12-06-2003, 12:15 PM

When you get ready reinstall the tranny (especially if you don't have a lift) cut hte heads off of a couple of long starter bolts and put them in the outside bellhousing bolt holes to make lining everything up a lot easier.

Chevyguy111786 · 12-06-2003, 01:09 PM

Thanks for the quick response guys. I think i'm gonna have this one done. It's something i want to do but do not have the facility to do it in. The street in front of my house isn't all that level. haha. Anyone know how much something like this might run me?

**old Rusty C10** · 12-06-2003, 01:18 PM

alot of shops will try to sell ya a rebuilt saying the seal went due to bearings goin in it unless they can show ya play in it dont buy the new tranny

Chevyguy111786 · 12-06-2003, 08:52 PM

thanx for the info. My neighbor owns a paint and body shop but does some of that kind of work too. So i'm thinkin he won't BS me around. You'd hope anyway right? haha. Thanks a lot for the advice and quick replys.

12-06-2003, 02:52 AM	#1
Chevyguy111786 Registered User Join Date: Apr 2003 Location: Garland, Texas Posts: 1,127	TH350 Front Seal My th350 is leakin and i believe it's the front seal. How hard is this to do? Would it be better to take it in? how much would it cost if i did it or if a mechanic did it? thanks, sorry for all the questions. Cory

12-06-2003, 02:57 AM	#2
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	You have to pull the tranny and remove the torque converter. After all of that, the seal is very easy to change. It's a chore if you don't have a lift. __________________ I'm on the Instagram- @Gearhead_Kevin

12-06-2003, 02:57 AM	#3
walker Registered User Join Date: Jul 2003 Location: north of Phx AZ about 30 miles Posts: 698	As I recall it was not difficult. $2 part. Hardest part is dropping the tranny. I am not a transmission expert but you might consider buying a transmission rebuild book to help you determine if you have other worn parts that are causing the seal to leak. __________________ Andy,Phx AZ '67 C-10 (Ahhh, done at last. Well there is that disk front end I want to put in and...) "23 C-Cab-sold '48 Ford 8N tractor(still working) '67 Scout(Now on the road) '70 MG B.-sold

12-06-2003, 03:04 AM	#4
DanoDMano Pronounced "Pew-al-up" Join Date: Oct 2002 Location: Puyallup, Washington Posts: 845	I just did mine, and like they say you will need to drop the tranny and remove the torque convertor. I replaced the convertor at the same time with one with a higher stall. dropping the tranny is easy, but reinstalling is a little tricky when it come to lining the spline up on the convertor to the motor. I puled my tranny with my motor so it was alot easier!! __________________ Classic GM Trucks of Washington Club Member 1970 FS chevy,350/350, Edelbrock cam and intake. Holley 650 carb,HEI,AT,Tangier Orange, 18's, Power Locks, Truck Photos

12-06-2003, 12:15 PM	#5
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	When you get ready reinstall the tranny (especially if you don't have a lift) cut hte heads off of a couple of long starter bolts and put them in the outside bellhousing bolt holes to make lining everything up a lot easier. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

12-06-2003, 01:09 PM	#6
Chevyguy111786 Registered User Join Date: Apr 2003 Location: Garland, Texas Posts: 1,127	Thanks for the quick response guys. I think i'm gonna have this one done. It's something i want to do but do not have the facility to do it in. The street in front of my house isn't all that level. haha. Anyone know how much something like this might run me?

12-06-2003, 01:18 PM	#7
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,303	alot of shops will try to sell ya a rebuilt saying the seal went due to bearings goin in it unless they can show ya play in it dont buy the new tranny __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

12-06-2003, 08:52 PM	#8
Chevyguy111786 Registered User Join Date: Apr 2003 Location: Garland, Texas Posts: 1,127	thanx for the info. My neighbor owns a paint and body shop but does some of that kind of work too. So i'm thinkin he won't BS me around. You'd hope anyway right? haha. Thanks a lot for the advice and quick replys.



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