Best pan gasket for a T400? (yeah..seriously) - Chevelle Tech
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post #1 of 51 (permalink) Old Feb 22nd, 19, 4:37 PM Thread Starter
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Alan
 
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Best pan gasket for a T400? (yeah..seriously)

So I've changed my pan gasket three times with different brands of cork gaskets, the last time I switched to a deep cast aluminum B&M pan and a Cometic cork gasket, and in 300 miles, its seaping, leaking again.



Anyone have a lead on a super duper pan gasket that WON'T leak? I only want to change it once more so...I'm not worried about cost..


Thanks in advance for any suggestions or tips of wizardry to stop a pan from leaking...

Rubber? Moroso Perm Align? duct tape?

1971 Corvette
VortecPro 496"
T400, Tight 10" converter
3.36 gears, 3700lb raceweight
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post #2 of 51 (permalink) Old Feb 22nd, 19, 4:54 PM
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Have you tried re snugging up the bolts?? Be careful not to over tighten but I have snugged mine back up a couple times and it helps !
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post #3 of 51 (permalink) Old Feb 22nd, 19, 4:57 PM Thread Starter
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Re: Best pan gasket for a T400? (yeah..seriously)

Quote:
Originally Posted by Shbradford View Post
Have you tried re snugging up the bolts?? Be careful not to over tighten but I have snugged mine back up a couple times and it helps !
Yeah, I did that after a couple hundred miles on every pan gasket I've had on it. Finally I gave up on the original steel pan, went to the B&M cast pan with a thick flange... The fluid seems to just seap right through the cork.

I'm thinking rubber gasket next time.

1971 Corvette
VortecPro 496"
T400, Tight 10" converter
3.36 gears, 3700lb raceweight
[email protected], 1.51 60'
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post #4 of 51 (permalink) Old Feb 22nd, 19, 5:06 PM
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Re: Best pan gasket for a T400? (yeah..seriously)

I have only tried the cellulose one (which seeped slightly), and a cork (which leaks far too much) with my B&M deep cast pan. I would think the Moroso 93103 would be best given it is designed like their valve cover gaskets (which seal perfectly with my GM cast valve covers) and the Fel Pro oil pan gasket of the same design.
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post #5 of 51 (permalink) Old Feb 22nd, 19, 5:12 PM
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Re: Best pan gasket for a T400? (yeah..seriously)

Something like this might work with your aluminum pan.

https://www.summitracing.com/parts/mor-93103

Dang it Kerry!
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post #6 of 51 (permalink) Old Feb 22nd, 19, 5:21 PM Thread Starter
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Alan
 
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Re: Best pan gasket for a T400? (yeah..seriously)

Quote:
Originally Posted by MarkP View Post
Something like this might work with your aluminum pan.

https://www.summitracing.com/parts/mor-93103

Dang it Kerry!

Yeah that looks like a good one.... Maybe worth a try. Lemme read some reviews on it...

It seems like sealing a trans pan is black magic. I've never seen more conflicting opinions and methods on anything...

1971 Corvette
VortecPro 496"
T400, Tight 10" converter
3.36 gears, 3700lb raceweight
[email protected], 1.51 60'
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post #7 of 51 (permalink) Old Feb 22nd, 19, 5:37 PM
 
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I use the moroso one on my th350 with a cast pan. No leaks and I haven't touched it for almost 2 years now.
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post #8 of 51 (permalink) Old Feb 22nd, 19, 5:55 PM Thread Starter
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Re: Best pan gasket for a T400? (yeah..seriously)

I just ordered the Moroso 93103. Hoping for the best. Trying to hit the track next Friday and donít want to take any chances...no drip drips...
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1971 Corvette
VortecPro 496"
T400, Tight 10" converter
3.36 gears, 3700lb raceweight
[email protected], 1.51 60'
STOCK APPEARING
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post #9 of 51 (permalink) Old Feb 22nd, 19, 6:12 PM
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Re: Best pan gasket for a T400? (yeah..seriously)

I donít have a definitive answer because I donít have near the experience that others have, but I have had success on my 6l90e, 4l80e and 4l60eís by using a torque wrench and tightening in stages in a pattern like a cylinder head. I havenít had any problems getting any to seal up, but maybe they offer a better gasket for these newer transmissions. I have done it twice in the last 6months on 6l90es with no leaks. If you are already doing this, disregard my comments
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post #10 of 51 (permalink) Old Feb 22nd, 19, 6:24 PM
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Re: Best pan gasket for a T400? (yeah..seriously)

I ended up putting Toyota gasket sealer on my 200-4R (making sure it doesn't get inside) with a cast pan, rubber gasket and no more leaks.

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post #11 of 51 (permalink) Old Feb 22nd, 19, 6:40 PM Thread Starter
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Re: Best pan gasket for a T400? (yeah..seriously)

Quote:
Originally Posted by yelchevelle View Post
I donít have a definitive answer because I donít have near the experience that others have, but I have had success on my 6l90e, 4l80e and 4l60eís by using a torque wrench and tightening in stages in a pattern like a cylinder head. I havenít had any problems getting any to seal up, but maybe they offer a better gasket for these newer transmissions. I have done it twice in the last 6months on 6l90es with no leaks. If you are already doing this, disregard my comments
Yeah for some reason, on the newer trannies, this doesn't seem to be a problem. I've had the pan off of my C7Z (8l90) and my wife's SS Camaro (8l90) and used the gm rubber gaskets and neither one seaps a drop.



On an RPM 4l60e, I had a cast pan on it with a cork gasket and it seaped all the time too....but not as bad as my T400 now.


Hopefully the moroso gasket will help. And yeah I always snug it up in a criss cross pattern and in stages. Never get it more then snug with a 3/8" ratchet. Guess I need to torque wrench it...

1971 Corvette
VortecPro 496"
T400, Tight 10" converter
3.36 gears, 3700lb raceweight
[email protected], 1.51 60'
STOCK APPEARING
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post #12 of 51 (permalink) Old Feb 22nd, 19, 7:03 PM
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Re: Best pan gasket for a T400? (yeah..seriously)

Permatex High Tack works well on trans pan gaskets.

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post #13 of 51 (permalink) Old Feb 22nd, 19, 7:27 PM
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Re: Best pan gasket for a T400? (yeah..seriously)

https://www.lubelocker.com/product/llt-g400/
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post #14 of 51 (permalink) Old Feb 22nd, 19, 7:45 PM
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Re: Best pan gasket for a T400? (yeah..seriously)

I've used the cork gasket on my T350.......but I used that Indian Head shellac or whatever on it...also used the rubber with the same stuff, no leaks.

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post #15 of 51 (permalink) Old Feb 22nd, 19, 8:49 PM
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Re: Best pan gasket for a T400? (yeah..seriously)

Cast aluminum pan with a steel core gasket.
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