Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - A couple problems - TH400 trans and power brakes
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Old 03-15-2010, 11:25 PM
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Yup, sounds like the booster is bad. Just replaced mine because of no power assist. It was also causing a vacuum leak throwing off my air/fuel ratio at idle.

As far as the no shift, check the hose connecting to the modulator and see if any trans fluid comes out. Sure sign the mod. is cooked.

Another guy just last week had a no shift problem after sitting for a few months but it turned out the hose was disconnected when he got it back from the shoddy shop he took it to.
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