skyhigh

Is this the right aftermarket transmission pan for my 350? on amazon it says doesn't fit a 72 cutlass, or any recommendations for an aftermarket pan. I do have a leak so I want to get a new pan since I need a gasket, and a pan with a plug would make life easier for future oil changes..thanks

joe_padavano

Every single TH350 ever made has the same 13 bolt trans pan bolt pattern. If it fits any TH350, it fits yours. On-line application catalogs are notoriously inaccurate, particularly with respect to Oldsmobiles. Do you really want one that deep with the fittings? I don't thing I paid that much for the whole transmission.

skyhigh

Well I wanted to use there gasket so I thought get there pan. Being Canadian its about 100 more than the US price lol, is there another pan you recommend Joe with a drain plug that will work with the Moroso gasket, I gladly get something else if you think its good..

joe_padavano

For the most part, I just use stock steel pans. If you want aluminum for the thicker flange, there are a number of options in the $60-$120 range (yeah, those are US numbers, so figure 30% higher or so). Summit has about 30 different TH350 pans from stock to extra deep. Your Moroso is $212 US.

skyhigh

Thanks for the tip Joe, just looking at this now, after price into Canadian and shipping I will save over 100

https://www.summitracing.com/int/par...1000/overview/

paired with this

https://www.summitracing.com/int/par...g350/overview/

Vintage Chief

Used 350 oil pans can be found literally everywhere. You might consider stopping by an auto salvage yard and/or a transmission shop.

joe_padavano

I'm guessing he can find a used OEM pan bolted to the bottom of his current trans. I assume he's looking for an aftermarket pan with a drain plug.

Vintage Chief

Ah. I was thinking his current pan had a hole (albeit leak) and I should have paid closer attention to the fact he did want an aftermarket.

olds 307 and 403

Do you really need a deep pan? The pan below worked fine for me. That gasket looks like the stock Mopar gaskets which well Summit and Moroso brands offer similar.
https://www.summitracing.com/int/parts/spe-5450/

Vintage Chief

That's a great looking pan; and, w/ a plug. Thanks for sharing.

skyhigh

Ok took your advice, went stock, but got alum, here what I ordered and it on the way, thanks everybody for you input, much appreciated, hope this fixs the leak, gotta watch the torque specs Cant wait to pick your guys brains about my wheel hop next, I will start a new thread when I'm ready to order some parts..


Pan:
https://www.summitracing.com/parts/sum-4338856

Gasket:
https://www.summitracing.com/parts/lub-llt-g350

Filter:
https://www.summitracing.com/parts/wix-58878

olds 307 and 403

https://www.summitracing.com/int/parts/sum-g3885b/ There is also a black pan, I like the idea of your aluminum pan. Let us know how that gasket works. One thing I did that helped these old trans seal was going tractor trans hydraulic fluid. Good luck.

skyhigh

Well the gasket is great, don't see any leaks from the pan gasket, the pan needed a little work to get it in, it didn't have the little bend like the old pan to get 2 bolts in by the tranny mount, so had to remove all the mount bolts, shim it back a little, wasn't easy due to old seized bolts, had to cut em, jack up the tranny a bit to get the last 2 bolts in. I still seem to be chasing a leak, I see drips coming off the black cover, any idea what I can try next, Its driving me crazy.

Vintage Chief

[QUOTE=skyhigh;1181069...I see drips coming off the black cover...[/QUOTE]
I was following up to this point...what black cover?

skyhigh

the Flexplate cover I think, you need to remove the black cover to install the new pan..

Vintage Chief

Ah, OK. The cover over the flexplate/torque converter. Is it transmission fluid or engine oil? Most/Often times it's engine oil seepage from the rear main (rope) bearing seal. Is it coming out the hole at the bottom of the cover? Identify if the oil is engine oil or trans oil first.

Vintage Chief

Two other notorious areas are the oil filter mount assembly and possibly the O-Ring at the bottom of the distributor where the distributor sits. Gobs of oil or small drips on occasion?

Vintage Chief

You can grab a small bottle of fluorescent/UV dye from any local auto parts store. Pour it into your engine oil and run the engine.

Remove the torque converter cover and clean the area thoroughly. Take vehicle for a short cruise. Visualize the area w/ a black light. The fluorescent/UV dye will demonstrate the trail of the oil.

skyhigh

It red fluid..tranny leak lol

Vintage Chief

First things first. Any chance you happened to overfill the transmission w/ transmission fluid when you filled the transmission with new fluid? This is a prime suspect if you inadvertently overfilled the fluid. Checked your fluid level both HOT & COLD?

skyhigh

Yes i did overfill it lol..i only added 4 litres at first..i bought 10...thought i would put 4 in and run the motor..need more according to the dip stick so i added another litre and it was over

Vintage Chief

I had my suspicion. OK. Run the engine 10 minutes. Check the transmission fluid. Ensure the transmission fluid is above the cold mark, but NOT above the HOT mark. The proper amount of fluid on a transmission at operating temperature should be as much as possible dead even between the COLD and HOT mark. Drain out some transmission fluid. You can use a siphon pump hose, or what I use is a large syringe attached to a long piece of clear tubing. It's a PITA pulling the syringe to suck out the trans fluid, but it beats dropping the pan! LOL Just ensure you get the fluid between the HOT & COLD mark. Once done drive it for several days - you'll probably be fine.

skyhigh

My new pan has a plug..might be easier...i will try that tomorrow. Thanks for the help..so where is the fluid coming from if it over

Vintage Chief

Lucky You! Plugs are so much nicer. Just ensure you're below the HOT mark when the engine is at operating temperature. You might have a leak for a couple days until the previous foaming of the transmission fluid settles down from overfilling it. Drive it regularly for several days and check if the leak is still there. Chances are it will be gone.

skyhigh

Well taking the fluid the proper levels didn't stop the leak lol..so I had enough, brought it to the tranny shop for a free diag and he told me the accumulator seal is leaking and the shifter shaft seal, so it goes in next week for the fix, he didnt have the parts i guess, so looking forward to a dry driveway. Any tips on how to the stains out?

matt69olds

Simple green or power purple. If it’s a concrete drive, use muratic acid.

Some of the early 350 had factory drain plugs. Typical GM, they eliminated the drain plug as a cost saving measure.