Transmission Pan Gasket

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Transmission Pan Gasket

Post by Bill on Thu Apr 28, 2016 1:30 am

I think I have a leak at the transmission pan gasket. I am trying to isolate it right now, but I have a quick question. Has anyone had any experience with the RTV gasket maker? I have some laying around from when I thought I was going to change my rear differential fluid on my Silverado and was going to use it instead of trying to track down a gasket. It looks like rockauto and autozone have the wrong part number and are selling the gasket for the GM 3 speed auto.

Thanks!!

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Re: Transmission Pan Gasket

Post by Bill on Thu Apr 28, 2016 3:38 am

Well, I just looked at the service manual. Looks like it is a seal and not a gasket. I will be crawling back under in the next couple of days to confirm where the leak is. the fluid is dripping off the speedo cable on the driver's side next to the transmission. I wouldn't think it was trans fluid based on where the leak is, however it is red and the transmission is pretty dry. I definitely will not be starting up the car.
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Re: Transmission Pan Gasket

Post by regal81455 on Thu Apr 28, 2016 9:11 pm

Check where the gear selector shaft is, guess it's pretty common place for it to leak and that would be on the DR side fairly close to the speedo cable. Might very well be where the speedo cable enters the trans too.

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Re: Transmission Pan Gasket

Post by Bill on Thu Apr 28, 2016 9:27 pm

It is wet near the gear selector hardware is. That may be the culprit. And the speedo quit working last season, so it could be that as well. I will go tracking it down. Have you ever changed over the fluid? Just wondering how the screen/filter was cleaned on the automatic.
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Re: Transmission Pan Gasket

Post by Bill on Thu Apr 28, 2016 9:29 pm

Also, I could care less about the speedo. I downloaded an app on my phone that shows my speed based off GPS. Much more accurate than the original speedo anyhow.
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Re: Transmission Pan Gasket

Post by regal81455 on Fri Apr 29, 2016 7:02 pm

I haven't changed the fluid/filter so I'm of no help. Sorry.

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Re: Transmission Pan Gasket

Post by Buwicked on Thu Jun 30, 2016 10:53 pm

i dont know if your transmission is still leaking, but i think fel pro make a gasket for the dual path. if you cant find it, look at kanter auto. i ordered a complete overhaul set 2years ago and the gasket was in the package......everything was nice......just a quick thought to conclude : two of my friends recently changed their tranny fluid on their antique cars (not buicks)......cleaned the pan, the filters, and put new fluid back in................ in a matter of days, their tranny blew up because of the high pressure on the clutches or bands because of the new
oil.
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Re: Transmission Pan Gasket

Post by Bill on Fri Jul 08, 2016 2:58 am

Ick. Well I guess I get to roll the dice. I have to do it - leaking too much through the speedo cable housing.
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