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Re: GMC Truck Transmission question
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Posted by Bob on February 03, 2005 at 08:45:02 from (66.163.134.177):
In Reply to: Re: GMC Truck Transmission question posted by Allan in NE on February 03, 2005 at 08:29:49:
Allen, you must be stressed out this morning, thinking about the wife's "horsey" needs! You got it right about he 4L80E having a variable displacement vane pump, but fumbled when you ageed with him that the pump is "bypassing all the time". The pump simply pumps the amount of oil required to maintain the computer-directed line pressure, so NO BYPASSING IS NEEDED. The older trannies with fixed displacment pumps were always pumping more oil than needed, and the pressure regulator was continuously bypassing the excess flow.
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