Tired of trans pan leaking - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chrismoore701 · 07-22-2018, 09:25 PM

I have a turbo 350 and the pan keeps leaking. So i am done with the stick pan and looking to get an aluminum one. What is the best pan for the money?

Thanks
Chris

**kwmech** · 07-22-2018, 09:54 PM

Sure it's the pan? Sometimes there are other small leaks that transfer down to the pan area that can be misleading

chrismoore701 · 07-22-2018, 10:02 PM

Yes. I have replaced the other seals

Matt Man · 07-22-2018, 10:25 PM

I put this on my trans when I had it rebuilt, works great no leaks. However, I would use a gasket with the steel insert in it instead of the cork one. Also, the extra fluid won't hurt. Its not the cheapest pan out there, but buy one cry once.

https://www.jegs.com/i/B-M/130/30280/10002/-1

pontgta · 07-22-2018, 10:40 PM

I use to get what seemed like 100% leak rate. I then got a 1/4 torque wrench, and now no more leaks

. This is of course assuming your pan is flat and has no issues.

geezer#99 · 07-22-2018, 10:49 PM

Is the vent clean?

andyh1956 · 07-22-2018, 11:37 PM

The TP Cable O Ring is notorious for seeping fluid & will manifest it's self on the pan flange.

chrismoore701 · 07-23-2018, 07:39 AM

I had one bolt in the pan that was stripped out, helicoil is now installed and getting a new bolt. The big issue I have noticed is a large spot on the garage floor from sitting a week or so. I am thinking it is the pan. I had a rubber gasket, that will be replaced with cork.

69heavychevy · 07-23-2018, 07:28 PM

I have the B&M pan mentioned above. Very solid unit. I've used it with a cork gasket and had no leaks. Correct torque is key with cork gaskets.
By the way I had the same issue with my trans leaking after sitting a few days. My leak was coming from a hole in the slip yoke. Threw some silicone on it, and stopped it. Now the only leak I have is from the speedometer bullet, haven't been able to fix that one.

**MikeB** · 07-23-2018, 08:28 PM

Get one of these cast aluminum pans and you will never have another pan gasket leak. That's because the gasket surface is very thick and won't warp like a stamped sheet metal pan. They're available from a kazillion vendors.

https://www.amazon.com/Chevy-Turbo-T.../dp/B003AOZMMY

chrismoore701 · 07-23-2018, 08:50 PM

I think that is the one i ordered. I tried to get a cork gasket but they don’t have any. Rubber ok with this one? Rtv?

**MikeB** · 07-23-2018, 08:54 PM

Mine came with a cork gasket, but fibrous rubber would be nice. I wouldn't use sealant with any of them because the gasket will want to move around.

**kwmech** · 07-24-2018, 07:29 PM

Yes, definitely no sealer/silicone......it acts like a lubricant when wet....makes the gasket slip out sideways

**Ol Blue K20** · 07-24-2018, 07:54 PM

My turbo350 would leak after sitting a few days. It wound up being the kick down cable o ring. I replaced it Nd the dipstick tube o ring. New filter and pan gasket no more leak.

S10Fan · 07-25-2018, 05:55 AM

I had leak issues with a TH350 in my Model A HotRod. After installing an aluminum pan like the one posted above and a gasket from Lube Locker, there's not a hint of fluid leak. I also changed the shift shaft seal, save yourself time and buy the correct tool for changing the seal.

Lube Locker gasket.............
https://www.summitracing.com/parts/l...g350/overview/

chrismoore701 · 07-25-2018, 07:35 AM

Quote:

Originally Posted by S10Fan

I had leak issues with a TH350 in my Model A HotRod. After installing an aluminum pan like the one posted above and a gasket from Lube Locker, there's not a hint of fluid leak. I also changed the shift shaft seal, save yourself time and buy the correct tool for changing the seal.

Lube Locker gasket.............
https://www.summitracing.com/parts/l...g350/overview/

Thanks, already changed the sift seal. Have the tool, agree with you 100%

chrismoore701 · 07-26-2018, 07:35 AM

Trans pan installed. Leaking worse than ever. It is leaking between the two (2) front bolts of the pan. I put the rubber gasket on here it came with. Did not have time to order a better one. But in 2 hours there was a 12" dia. puddle under the truck. The other issue is this is the third time I had this pan off in 2 years and now I have three holes stripped. Helicoils installed so we are good. Should I just put coils in all the holes?

geezer#99 · 07-26-2018, 08:50 AM

Did you ever check the vent?

**Ol Blue K20** · 07-26-2018, 08:50 AM

What are you torqing the bolts at?

Desert1957 · 07-26-2018, 08:58 AM

2 front bolts?

Front pump o ring?
Torque converter shaft seal?
Cracked case?

Iv'e seen a lot of leaks up front sling around by the torque converter, then drip after vehicle sits over night.

Brake clean it off and watch it...

chrismoore701 · 07-26-2018, 10:15 AM

The two front bolts of the pan. I torqued to 10 ftlbs. I did not check the vent. I was in a rush last night. Could this cause the pan to leak? It is defiantly coming from the pan. I will check that. What about getting that fancy gasket from summit?

geezer#99 · 07-26-2018, 11:13 AM

The hot air in the case needs to go somewhere.
If the vent is plugged the hot high air pressure will push out gaskets.

chrismoore701 · 07-26-2018, 02:12 PM

I'm on it

Thanks
Chris

**Ol Blue K20** · 07-26-2018, 03:29 PM

Bolt holes shouldn't be striping unless they're over torqued. I believe their supposed to be 35 inch pounds

chrismoore701 · 07-26-2018, 04:23 PM

Every where I saw was 10-13 ftlbs. So I did 120 inchlbs just to use my smaller wrench. I looked at multiple sites. No telling what I did to this thing years ago, It was on my original engine and had it freshened up 4,000 miles ago.

07-22-2018, 09:25 PM	#1
chrismoore701 Registered User Join Date: Dec 2004 Location: Highland, IN Posts: 2,328	Tired of trans pan leaking I have a turbo 350 and the pan keeps leaking. So i am done with the stick pan and looking to get an aluminum one. What is the best pan for the money? Thanks Chris __________________ Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart My build 2008-2016. http://m.imgur.com/a/bURrE

07-22-2018, 09:54 PM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,718	Re: Tired of trans pan leaking Sure it's the pan? Sometimes there are other small leaks that transfer down to the pan area that can be misleading

07-22-2018, 10:02 PM	#3
chrismoore701 Registered User Join Date: Dec 2004 Location: Highland, IN Posts: 2,328	Re: Tired of trans pan leaking Yes. I have replaced the other seals __________________ Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart My build 2008-2016. http://m.imgur.com/a/bURrE

07-22-2018, 10:25 PM	#4
Matt Man Registered User Join Date: Oct 2009 Location: Buhl, Idaho Posts: 1,438	Re: Tired of trans pan leaking I put this on my trans when I had it rebuilt, works great no leaks. However, I would use a gasket with the steel insert in it instead of the cork one. Also, the extra fluid won't hurt. Its not the cheapest pan out there, but buy one cry once. https://www.jegs.com/i/B-M/130/30280/10002/-1 __________________ 86 c30 crew cab dually 454/400 4/6 drop SOLD 1-8-11 1981 chevy K10 short Bed Scottsdale SOLD 10-26-2020 67 GMC Stepside Straight six/3 on the tree "The Peach" 2020 Silverado Double Cab LT Z71 5.3 8 speed Daily Driver K10 build http://67-72chevytrucks.com/vboard/s...d.php?t=671934 The Peach build http://67-72chevytrucks.com/vboard/s...d.php?t=733903

07-22-2018, 10:40 PM	#5
pontgta Registered User Join Date: Nov 2009 Location: Haines City FL Posts: 461	Re: Tired of trans pan leaking I use to get what seemed like 100% leak rate. I then got a 1/4 torque wrench, and now no more leaks. This is of course assuming your pan is flat and has no issues.

07-22-2018, 10:49 PM	#6
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,777	Re: Tired of trans pan leaking Is the vent clean?

07-22-2018, 11:37 PM	#7
andyh1956 Registered User Join Date: Mar 2010 Location: thomastown mississippi Posts: 1,261	Re: Tired of trans pan leaking The TP Cable O Ring is notorious for seeping fluid & will manifest it's self on the pan flange.

07-23-2018, 07:39 AM	#8
chrismoore701 Registered User Join Date: Dec 2004 Location: Highland, IN Posts: 2,328	Re: Tired of trans pan leaking I had one bolt in the pan that was stripped out, helicoil is now installed and getting a new bolt. The big issue I have noticed is a large spot on the garage floor from sitting a week or so. I am thinking it is the pan. I had a rubber gasket, that will be replaced with cork. __________________ Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart My build 2008-2016. http://m.imgur.com/a/bURrE

07-23-2018, 07:28 PM	#9
69heavychevy Registered User Join Date: Jan 2007 Location: Garland,TX Posts: 431	Re: Tired of trans pan leaking I have the B&M pan mentioned above. Very solid unit. I've used it with a cork gasket and had no leaks. Correct torque is key with cork gaskets. By the way I had the same issue with my trans leaking after sitting a few days. My leak was coming from a hole in the slip yoke. Threw some silicone on it, and stopped it. Now the only leak I have is from the speedometer bullet, haven't been able to fix that one. __________________ 80 C10 SWB Step Side - 350 w/ vortec heads, TH350, 12-bolt 3.73

07-23-2018, 08:28 PM	#10
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,666	Re: Tired of trans pan leaking Get one of these cast aluminum pans and you will never have another pan gasket leak. That's because the gasket surface is very thick and won't warp like a stamped sheet metal pan. They're available from a kazillion vendors. https://www.amazon.com/Chevy-Turbo-T.../dp/B003AOZMMY __________________ Mike 1969 C10 LWB -- owned for 36 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- converted from 250-six to roller cam 350, Vortec heads -- sold 1981 C10 Silverado LWB, 305, TH350C -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!

07-23-2018, 08:50 PM	#11
chrismoore701 Registered User Join Date: Dec 2004 Location: Highland, IN Posts: 2,328	Re: Tired of trans pan leaking I think that is the one i ordered. I tried to get a cork gasket but they don’t have any. Rubber ok with this one? Rtv? __________________ Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart My build 2008-2016. http://m.imgur.com/a/bURrE

07-23-2018, 08:54 PM	#12
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,666	Re: Tired of trans pan leaking Mine came with a cork gasket, but fibrous rubber would be nice. I wouldn't use sealant with any of them because the gasket will want to move around. __________________ Mike 1969 C10 LWB -- owned for 36 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- converted from 250-six to roller cam 350, Vortec heads -- sold 1981 C10 Silverado LWB, 305, TH350C -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!

07-24-2018, 07:29 PM	#13
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,718	Re: Tired of trans pan leaking Yes, definitely no sealer/silicone......it acts like a lubricant when wet....makes the gasket slip out sideways

07-24-2018, 07:54 PM	#14
Ol Blue K20 Proprietor of Dale's Corner Join Date: Nov 2012 Location: Vacaville , CA Posts: 16,362	Re: Tired of trans pan leaking My turbo350 would leak after sitting a few days. It wound up being the kick down cable o ring. I replaced it Nd the dipstick tube o ring. New filter and pan gasket no more leak. __________________ "Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man R.I.P. FleetsidePaul

07-25-2018, 05:55 AM	#15
S10Fan Old Heap Driver Join Date: Mar 2008 Location: Newport News, Va Posts: 2,643	Re: Tired of trans pan leaking I had leak issues with a TH350 in my Model A HotRod. After installing an aluminum pan like the one posted above and a gasket from Lube Locker, there's not a hint of fluid leak. I also changed the shift shaft seal, save yourself time and buy the correct tool for changing the seal. Lube Locker gasket............. https://www.summitracing.com/parts/l...g350/overview/ __________________ _____________________________ Bryan '99 Silverado 1500, 4.3, 5-speed, reg cab, short bed '50 Chevy 2DR Hard Top, 350/350, M2 Front End, 3:08 gear, cruiser. '40 F**d Sedan, all Chevy power, Heidt's front end, TCI rear, nice driver.



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07-26-2018, 07:35 AM	#17
chrismoore701 Registered User Join Date: Dec 2004 Location: Highland, IN Posts: 2,328	Re: Tired of trans pan leaking Trans pan installed. Leaking worse than ever. It is leaking between the two (2) front bolts of the pan. I put the rubber gasket on here it came with. Did not have time to order a better one. But in 2 hours there was a 12" dia. puddle under the truck. The other issue is this is the third time I had this pan off in 2 years and now I have three holes stripped. Helicoils installed so we are good. Should I just put coils in all the holes? __________________ Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart My build 2008-2016. http://m.imgur.com/a/bURrE

07-26-2018, 08:50 AM	#18
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,777	Re: Tired of trans pan leaking Did you ever check the vent?

07-26-2018, 08:50 AM	#19
Ol Blue K20 Proprietor of Dale's Corner Join Date: Nov 2012 Location: Vacaville , CA Posts: 16,362	Re: Tired of trans pan leaking What are you torqing the bolts at? __________________ "Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man R.I.P. FleetsidePaul

07-26-2018, 08:58 AM	#20
Desert1957 Registered User Join Date: Apr 2009 Location: New Freedom Pa. Posts: 1,335	Re: Tired of trans pan leaking 2 front bolts? Front pump o ring? Torque converter shaft seal? Cracked case? Iv'e seen a lot of leaks up front sling around by the torque converter, then drip after vehicle sits over night. Brake clean it off and watch it... __________________ Desert

07-26-2018, 10:15 AM	#21
chrismoore701 Registered User Join Date: Dec 2004 Location: Highland, IN Posts: 2,328	Re: Tired of trans pan leaking The two front bolts of the pan. I torqued to 10 ftlbs. I did not check the vent. I was in a rush last night. Could this cause the pan to leak? It is defiantly coming from the pan. I will check that. What about getting that fancy gasket from summit? __________________ Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart My build 2008-2016. http://m.imgur.com/a/bURrE

07-26-2018, 11:13 AM	#22
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,777	Re: Tired of trans pan leaking The hot air in the case needs to go somewhere. If the vent is plugged the hot high air pressure will push out gaskets.

07-26-2018, 02:12 PM	#23
chrismoore701 Registered User Join Date: Dec 2004 Location: Highland, IN Posts: 2,328	Re: Tired of trans pan leaking I'm on it Thanks Chris __________________ Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart My build 2008-2016. http://m.imgur.com/a/bURrE

07-26-2018, 03:29 PM	#24
Ol Blue K20 Proprietor of Dale's Corner Join Date: Nov 2012 Location: Vacaville , CA Posts: 16,362	Re: Tired of trans pan leaking Bolt holes shouldn't be striping unless they're over torqued. I believe their supposed to be 35 inch pounds __________________ "Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man R.I.P. FleetsidePaul

07-26-2018, 04:23 PM	#25
chrismoore701 Registered User Join Date: Dec 2004 Location: Highland, IN Posts: 2,328	Re: Tired of trans pan leaking Every where I saw was 10-13 ftlbs. So I did 120 inchlbs just to use my smaller wrench. I looked at multiple sites. No telling what I did to this thing years ago, It was on my original engine and had it freshened up 4,000 miles ago. __________________ Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart My build 2008-2016. http://m.imgur.com/a/bURrE

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