Still weeps th350

[wasted wages]

It's very possible that the front pump gasket or the pump to case o-ring is leaking.

Both are likely to leak without the engine running.

Another thing that can happen on old automatics.... when the front hub bushing to the converter starts to wear, air will bleed into the torque converter causing the fluid to spill into the trans and overfill the pan.
then the fluid seeps out anywhere it can...

once you crank up the engine, the convertor fills back up and it may not leak again for a week...

if I let two of my older trucks sit for more than a few days,,,trans fluid starts running down the driveway.... one is a powerglide, and the other is a T-350....both do it.

I have to crank them every few days to keep it from happening..

 

[TJ1978]

It's very possible that the front pump gasket or the pump to case o-ring is leaking.

Both are likely to leak without the engine running.

Another thing that can happen on old automatics.... when the front hub bushing to the converter starts to wear, air will bleed into the torque converter causing the fluid to spill into the trans and overfill the pan.
then the fluid seeps out anywhere it can...

once you crank up the engine, the convertor fills back up and it may not leak again for a week...

if I let two of my older trucks sit for more than a few days,,,trans fluid starts running down the driveway.... one is a powerglide, and the other is a T-350....both do it.

I have to crank them every few days to keep it from happening..

Seems these TH350’s just leak and the only way they dont is when they have no fluid in them.

 

[onetonbb74]

Did you check the shifter shaft seal? Mine sweats there and puts a dot of atf on the pan bolt.

 

[TJ1978]

Did you check the shifter shaft seal? Mine sweats there and puts a dot of atf on the pan bolt.

Yup but the fluid collected higher not where that leak would travel...

 

[centexk5]

My drain plug has a constant drop on it but it doesn't leak on the driveway.

 

[wasted wages]

A lot of people buy a deep pan that holds two extra quarts,,,and then don't add the two extra... that way the level doesn't ever reach the problem areas...

the pan comes with an extension for the filter, so it stays submerged in the fluid...

never tried it,,, just passing on an idea..

 

[cuervo]

For the record,every GM automatic I've had always had some seepage there ,at the front of the pan..as long as it didn't make puddles in my garage or driveway ,I just ignored it...fluid level never dropped any drastic amount,I may have had to add a 1/2 pint or so about every 6 months to a year.."some" seepage I consider normal...its rare to see a perfectly dry automatic ..ATF is a great penetrating oil..

I've never had that issue of seepage around the pan or the front seal. I don't believe this is normal behavior.

 

[diesel4me]

Well,every vehicle I've owned had well over 100,000 miles on them ,so some seal wear or dried up gaskets were likely not out of the question..but none lost a great deal of fluid in a short period of time,I did not consider a 1/2 quart every 6 months to a year "excessive"..

As long as I wasn't adding ATF every week to the tune of a quart or more,I just let them seep..up here a little seepage is not such a bad thing,it coats the chassis and undersides and keeps rust at bay..
The few automatics I've seen with no seepage at all have a nice crusty white "cream of wheat" looking pasty grunge attacking the aluminum..probably a side effect of the caustic road salts used here in winter..

 

[TJ1978]

I've never had that issue of seepage around the pan or the front seal. I don't believe this is normal behavior.

Consider yourself lucky. There probably isnt a topic with more threads across the interwebs with the title “th350 leaking”

It has like 12 or more know areas it can leak, weep etc. If yours isn’t leaking, it probably has no fluid in it. hahahHaha

 

[cuervo]

Consider yourself lucky. There probably isnt a topic with more threads across the interwebs with the title “th350 leaking”

It has like 12 or more know areas it can leak, weep etc. If yours isn’t leaking, it probably has no fluid in it. hahahHaha

My reply was to every GM automatic leaked. In my 40 years of driving I haven't had an leaks that could not be fixed on them. In general I've never really had a problem with transmissions leaking. Now cooler lines are a different story.

 

[diesel4me]

"Seepage" = slight coating of oil on a part,with a drop hanging off,that never seems to drop off to the ground..fluid level remains full or nearly so,for an extended period of time..(like months to a year)..

"Leakage" = fluid loss that ends up making spots or puddles under the vehicle,and adding more is needed to be done often..

This is not good,and I wouldn't drive a vehicle that loses a substantial amount of ATF in a short period of time,because that will almost certainly end up ruining the transmission when the fluid level drops too low to allow it to shift and maintain proper line pressures..

 

[cuervo]

"Seepage" = slight coating of oil on a part,with a drop hanging off,that never seems to drop off to the ground..fluid level remains full or nearly so,for an extended period of time..(like months to a year)..

"Leakage" = fluid loss that ends up making spots or puddles under the vehicle,and adding more is needed to be done often..

This is not good,and I wouldn't drive a vehicle that loses a substantial amount of ATF in a short period of time,because that will almost certainly end up ruining the transmission when the fluid level drops too low to allow it to shift and maintain proper line pressures..

I dated a lot of girls that had seepage, but only for one night.

 

[wasted wages]

Leakage" = fluid loss that ends up making spots or puddles on the sheets

Dated a few that had quite a bit of leakage....

 

[diesel4me]

Quagmire Ewww - YouTube

 

[Recon 78]

Mine seeps a bit lol
Seems like after all the nice work you've done on the pan it mite be from somewhere else

Looked close at your pic, i think if it was the pan, it would seep and go down the side not go sideways

Somthing under the front cover? Pump housing, converter?
I'd pull the dust cover a check it out

 

[TJ1978]

Mine seeps a bit lol
Seems like after all the nice work you've done on the pan it mite be from somewhere else

Looked close at your pic, i think if it was the pan, it would seep and go down the side not go sideways

Somthing under the front cover? Pump housing, converter?
I'd pull the dust cover a check it out

View attachment 322337

It was the pan and governor cover.
Now its governor cover and possibly torqu or pump...

Oh well, just gives me something to do

 

[Recon 78]

Earlier in the thread you said there's like 12 known leak points

Mine's probly using all of them, lol

I get tryin to fix it, your rig is so clean it's worth it

 

[TJ1978]

Earlier in the thread you said there's like 12 known leak points

Mine's probly using all of them, lol

I get tryin to fix it, your rig is so clean it's worth it

That’s my plan. Lol, Ive spent more $ of atf fluid, pans and gaskets that I would have liked. But so it goes with these trucks.

I have a feeling, and since I dont know the trucks history, the transmission will need to be pulled eventually for a rebuild. So I can just be fresh going forward. The engine is a fresh rebuild but has 350’s goes, it already weeps in a couple spots.

 

[TJ1978]

Ok I pulled-ish (to wiggle it completely off I have to undo the driver side exhaust, which im not doing at least yet) I used my extendable mirror), and fingers to feel around for thay great red liquid, nothing was dripping from the torque converter, it was dry.

But when I wiped my finger right above pan, (pictured below) there was some ATF. Which leads me to think its a seal from the shaft, or something. But it is odd. It dripped from there before even firing up the truck, having had just filled the pan after it drained for a a day or so. Who knows maybe I spilled some...

Could lifting the Tcase to put on the new tranny mounts messed something up?

I also noticed some oil, not atf coming out of the rear drive line where it connects to the transfer case...???

 

[TJ1978]

I dont see trail of it coming down from the shaft. Its like pooled right behind that lip? I can reach my finger up there, barely and it gets nice and red.

Weird thing is, it never leaked here before. Now my pan and governor dont leak and now it leaks above the pan. And pretty good Id say. Nice wet spot on the cardboard...

You can see in the pic the torque converter is dry.