Thread: TH400 Slipping
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Old 02-01-2001, 11:47 PM
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Join Date: Feb 2001
Location: Renton, WA USA
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1972 TH 400 Trans. Professionally rebuilt (by a friend who's now out of the business)New clutches, shift kit installed and a big (BIG) trans cooler on 3/16's cooling lines. Fluid is up, no leaks, but it just started slipping.
When I start the car, drop it in drive I can feel the clutches try to engage but not quite get the pressure they need. If I shift into first it builds pressure and then can be shifted into drive and drives normally until I shut it off again.

My concerns are that the trans is running too cool, or that the valve body is coming loose.