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t56 leak test

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Old 02-11-2017, 05:01 PM
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t56 leak test

I had to measure the run-out on my quicktime bellhousing. To do that, I removed the front plate from the T56. I've connected the front plate back to the transmission with permatex gasket maker. Before I install my engine and transmission into my trans am, I would like to leak test the T56 to make sure the gasket works. Can I use rubbing alcohol? It's much easier to clean up than transmission fluid, and it evaporates.
Old 02-12-2017, 12:01 AM
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jmd
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Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R
Re: t56 leak test

Did it leak before?
Were the sealing surfaces properly cleaned before reinstall? And reasonably free from scarring?
No reason to waste time and money.
I don't know which gasket maker you used but ultra RTV from permatex is what I always use.
Old 02-12-2017, 10:07 AM
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Re: t56 leak test

No, it didn't leak before. I did clean the sealing surfaces, and that took forever. Getting the old sealant off wasn't easy. I used a tooth brush, lacquer thinner, and another gunk remover. And I used ultra gray RTV. It was the first time I did this, and I'd hate to get the transmission mounted and then discover that it leaks.
Old 02-12-2017, 10:10 AM
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Re: t56 leak test

I also had to use a razor blade to remove excess sealant around the outside of the transmission (after the stuff dried). Maybe I used to much permatex, because it mashed outward when I bolted the plate to specs.
Old 02-12-2017, 03:05 PM
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jmd
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Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R
Re: t56 leak test

Ultra gray is why it was a pain in the *** to clean off. Use black. I don't know who is feeding the suggestion to use grey; on a non-pressurized die-cast assembly unit, it does nothing better.

A steel bristle brush will take most off easy, razor blade is good too.

Torque all 11 bolts evenly, you won't have issues.

A tiny line will squeeze very little out the edges. Not a big deal to have used too much.
Old 02-12-2017, 03:54 PM
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Re: t56 leak test

Thanks - that puts my mind at ease. Ultra gray was what was used before. I took the transmission to a shop for stage 2 upgrade. And yes, it was a pain the *** to remove.




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