6/8/05

Mike, After I set the transbrake I let off the breaks and the car rolls forward an inch or two. I have a Powerglide. What is wrong? Thanks, John

John,

It sounds like a simple problem right, wrong. In your situation it's possible you might be doing something we call suspension wind up, or before you apply the transbrake the

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suspension is loaded and when you let off the footbrake it releases the suspension for your inch or two of movement, anything beyond this would be a transmission problem.

In the transmission the reverse clutch grabs to keep the car from moving forward when you apply the transbrake button. If this clutch doesn't clamp down quick and tight the car will move, it takes first gear oil pressure to apply reverse, so if the engine is idling low at 600 RPM or so the transmission pump is not running very fast so it has a hard time filling the void behind the reverse piston, so we like to stage the car at least at 1200 RPM or higher so we have plenty of fluid volume to apply the reverse clutch quick and tight, this is a fairly simplified explanation as there are a lot of other factors that also work into the mix such as worn pump, glazed clutch pack etc. but maybe this will give you some areas to look at.

Mike
Mike’s Transmission
Lancaster CA
(661) 723-0081

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