Any mechanics out there have any tips on ensuring a leak free transmission pan seal? I’m changing the fluid and filter in my GMC Sierra. I dropped the pan after work today. I’ve changed trans fluid…I dunno, 6 or 8 times in different vehicles - but this one’s a pain. Difficult to get the pan out sin…

This might be of help. [image] Problems with flimsy gaskets Maintenance/Repairs Sometimes I run into a little setback when doing diy’er auto repairs where a gasket is configured with narrow strips, and when it’s time to put the two pieces together and sandwich the gask…

If you will accept a tip from a ham fisted amateur, what I have done with long floppy gaskets in tight places is first remove any dimpling from the pan rails then use light sewing thread to tie the gasket to the pan. after you gt the pan in place, start the bolts and then slice the threads with a ra…

Thanks, guys. All advice welcome. I’m not so much worried about the gasket slipping out of place. Usually, I’ll put the gasket on the pan and start a few bolts on the corners. Most times, the gasket is tight around the bolts. The gasket holds the bolts in place, and the bolts keep the gasket aligne…

Just did my 99 Buick LeSabre, I too hated the flimsy rubber gaskets. However I did not spill a drop of tranny fluid by lifting the front of the car and loosening lower and bolts until I had a drip then loosen more until I had a good amount coming out and left it sit for an hour in a big pan. That wa…

The very first time I pull any trans pan without a drain plug, I add one of my own. All but one trans filter I ever changed had anything of consequence in it. And I knew what to expect based on the fluid that came out. The other 99% of the time, a fluid change was all that was really required. So I …

My Buick has no drain plug, that’s why I purchased a little pump from Harbor Freight it got 90% of the fluid out of the pan, however it still left some in the torque converter. I think it holds 6 quarts and I got five quarts with the pump through the dipstick , using the pump I will do this every 30…

If you have a torque spec, you could use that, but first run each bolt down to snug. The reason is that if you were to run bolt down all the way to torque spec, it could cantilever the pan and actually be too tight when all the other bolts are torqued down. Now if you were a mechanical engineering…

What about running a bead of Permatex 33694 on both sides of the new gasket? A belt and suspenders approach.

What I’ve experienced is pan gasket leaks (oil or tranny) were caused by not removing the old gasket. Remove it and then scrape any residue and then sand paper it. @oldtimer-11 had a good point to about removing any dimples in the pan around the bolt holes which were caused by the oil pan bolts.

Alright, thanks folks. Finished it up this afternoon. The old cork gasket came off well. I used a razor to remove any residual. Brake clean and a rag to clean the pan and mating surfaces. I didn’t sand anything. Read that a little too late. I snugged all the bolts down with my fingers. Then snugged …

Transmission pan gasket tips

Maintenance/Repairs

George_San_Jose1 January 16, 2019, 3:59am 2

This might be of help.

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Transmission pan gasket tips

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