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Turbo 350 transmission pan torque specs

Tiny
DAYTON41799
  • MEMBER
  • 1994 CHEVROLET 1500
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 246,000 MILES
I have a turbo 350 in my k1500. And my old pan was warped and the gasket was bad. So I bought a brand new pan with a new rubber gasket. I tightened hem down to when the rubber started squeezing out. And it’s stilling at a bolt. Why?
Friday, May 17th, 2019 AT 10:48 AM

9 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,300 POSTS
Welcome to 2CarPros.

Do you mean it is leaking where the bolts tighten the pan to the housing? Are you sure you didn't over tighten the pan and split the gasket? I attached a pic of the pan assembly. Let me know exactly where it is leaking.

Also, picture 2 is the torque specs for the pan. When I tighten them, I draw them all snug, then in a crisscross pattern work my way around the pan to final torque.

Let me know.

Joe
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Friday, May 17th, 2019 AT 8:48 PM
Tiny
DAYTON41799
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That’s not the right transmission. But yes I tightened them to 8 pounds when I did it.
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Friday, May 17th, 2019 AT 8:52 PM
Tiny
JACOBANDNICKOLAS
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Welcome back:

Interesting. That is the one they show for this model. If it is still leaking where the bolts go through, I have one more question. Is the pan new that you installed or used? If it was used, did you peen the bolt holes flat?

Joe
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Friday, May 17th, 2019 AT 10:20 PM
Tiny
DAYTON41799
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  • 20 POSTS
I swapped the 4l60 for a turbo 350. And the pan and gasket was brand new. Almost $80.00 pan and gasket.
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Friday, May 17th, 2019 AT 10:47 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,300 POSTS
Welcome back:

The only thing you can do is check to make sure you didn't split the gasket, check the transmission case to see if it is flat and there are no hairline cracks, and take a ball peen hammer and slightly peen the bolt holes on the pan away from where it mounts. Also, check to make sure the new pan is true.

I'm confident that isn't what you wanted to hear, but it has to come off again to determine the cause. You can try to save the fluid.

Let me know what you find.

Joe
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Saturday, May 18th, 2019 AT 8:44 PM
Tiny
DAYTON41799
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I bought a pan with a drain plug for these type of problems lol. So I’ll be saving all the fluid.
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+1
Saturday, May 18th, 2019 AT 10:16 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,300 POSTS
That was a good idea. Let me know what you find. Make sure when you reinstall the pan that both surfaces are clean and dry. I have to be honest, I'm curious what is causing it. If everything is new, it should be fine.

If you can, let me know what you find.

Take care,
Joe
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Saturday, May 18th, 2019 AT 10:51 PM
Tiny
DAYTON41799
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I will let you know. Might not be till Monday or Tuesday when I’m off and can go out and do it. But I will definitely be letting you know.
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Saturday, May 18th, 2019 AT 10:52 PM
Tiny
JACOBANDNICKOLAS
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I appreciate it. Take care.

Joe
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Saturday, May 18th, 2019 AT 11:00 PM

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