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

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

Re: Tired of trans pan leaking
 

Yes. I have replaced the other seals

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

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

Re: Tired of trans pan leaking
 

Is the vent clean?

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.

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.

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.

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

https://encrypted-tbn0.gstatic.com/i...0pkiAWfoZ1-xrz

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?

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.

Re: Tired of trans pan leaking
 

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

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.

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/

Re: Tired of trans pan leaking
 

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

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?

Re: Tired of trans pan leaking
 

Did you ever check the vent?

Re: Tired of trans pan leaking
 

What are you torqing the bolts at?

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...

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?

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.

Re: Tired of trans pan leaking
 

I'm on it

Thanks
Chris

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

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.

Re: Tired of trans pan leaking
 

Project update. I looked and i have no vent. I poked around with a small drill bit and seems like the hole is plugged solid. Almost like it is from factory. I assume there is not a chance it would be sealed off. What’s my next step? I have 4000 miles on this since a fresh up that i had a trans shop do for me before i installed the motor.

Thoughts?

Thanks

Re: Tired of trans pan leaking
 

My buddy said to lift the dipstick cap and let it vent there.

Re: Tired of trans pan leaking
 

The vent tube(check valve) on your th350 is 8-10" above the gear selector seal.

Should be able to run your paw up there and feel it.

If you remove the driveshaft(s) and lower the cross member you can drop the transmission enough to install a tube or replace the check valve. Pull your distributor cap also just to be safe.

Some shops will paint right over the thing or never replace it.

If the thing is 2wd a check valve is alright to run. If 4wd a tube going up the bell and to the firewall will avoid you thinking about another rebuild when you have a water/mud slurry seeping into the cab.

Re: Tired of trans pan leaking
 

The issue is the hole is plugged solid. I can feel it. Concerned about pushing what ever is in the home into the trans. Options?

Re: Tired of trans pan leaking
 

Situations like this is why I bought one of these to keep in my tool box............

https://www.ebay.com/itm/6-LED-USB-W...from=R40&rt=nc

Re: Tired of trans pan leaking
 

Why would a rebuilder plug the vent? Rookie mistake.

Re: Tired of trans pan leaking
 

That is a good question, I think I might call him, it was a long time ago, but maybe something he knows or normally does.

So the question is, how do I go about getting it open? Stab it with a pick? Drill it out? what?

thanks

Re: Tired of trans pan leaking
 

I called the trans shop, they said they would never seal it, which is what I expected, but look at the pic I found, No breather.

Re: Tired of trans pan leaking
 

What’s in that vent hole 10 inches straight up from the shift shaft?

Re: Tired of trans pan leaking
 

Yes, you are well beyond pan gasket leak. :(

Re: Tired of trans pan leaking
 

That is the question. It feels hard as hell. What do i do to get it out? Stab it with an ice pick? Drain the pan and blow air into it? I have a new pan with a drain plug? Or drill it out?

Thanks

Re: Tired of trans pan leaking
 

Take a closeup pic.
Post it for us and take it to your tranny guy and show him (if the tranny is still on warranty).
Might just be a soft plug.

Re: Tired of trans pan leaking
 

Whatever is in there should be able to be drilled out. If you drill very slow most of the material should be pulled upward by the drill bit and hopefully very little will end up in the trans. It can't be metal so whatever it is shouldn't be terribly harmful and should stay in the pan and the filter won't let it in the valve body. How did the rebuilder not notice this??

Re: Tired of trans pan leaking
 

Had it freshened up 4-5 years ago. As you can see from the pic had it done. Dropped on the frame. Then built the truck. On the road 3 years. 4,000 miles. Minor leaks.

Now this.

Re: Tired of trans pan leaking
 

If ever need to drill anything out and you’re worried about shavings, just put some grease on the drill bit. The shavings will stick to the grease.