Thread: TH400 questions
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Old 12-01-2023, 09:21 AM
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chuckies76ta chuckies76ta is offline
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Join Date: Jun 2004
Location: Canada
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The outlet line to the trans cooler does that come straight from the pump? And what is the psi range there?

I tested my feed line to the cooler this pass summer and I was around 60 psi hot as I can remember. From what I understand, high pressure on this line is a no no. In Cliff's book page 94 talks about reducing the size of the converter feed hole in the pump on performance builds. I think I drilled mine out to .125

Here is a good read. https://www.sonnax.com/tech_resource...-lube-circuits

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68 Firebird. IA2 block, 505 cu in, E-head, Solid roller 3650 weight. Reid TH400 4:11 gear. 29" slick.
Best so far 10.12@133 mph. 1.43 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
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