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Old 12-29-2021, 01:08 PM   #1
reknapp52
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Default Powerglide Thread Size

I have a new Ultra-Case trans ordered from JW Performance. They are closed for the holidays so I can't get any info from them. I am wondering what thread size they use where cooler lines are plumbed in. Stock PG has 1/8 NPT which adapts nicely to -4 AN fittings. Most trans coolers I've looked at, and the one I purchased, have -6 fittings, which typically are mated to a 1/4 NPT. Any help is appreciated--thanks!
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Old 12-29-2021, 05:11 PM   #2
Craig Porter
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Default Re: Powerglide Thread Size

Most aftermarket P/G cases have 1/4 npt and use-6 coolant lines. If you want to use your -4 fittings you could use a brass step down adapter.Hope this helps
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Old 12-30-2021, 12:45 AM   #3
reknapp52
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Default Re: Powerglide Thread Size

Thanks Craig, I was really hoping to avoid using adapters. My new cooler has -6 fittings.
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Old 01-02-2022, 10:52 PM   #4
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Default Re: Powerglide Thread Size

No matter what….-4 fittings are too small for cooler flow.
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Old 01-05-2022, 05:23 PM   #5
reknapp52
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Default Re: Powerglide Thread Size

voltdr, that's good to know--could be part of my temp issues.
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