4l80e tcc apply in reverse
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tc applying in reverse.TRANSCRIPT
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7/18/2019 4L80E Tcc Apply in Reverse
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Date: Tue Apr 5 09:37:38 PDT 2011Subject: RE: 4L80E, Vehicle surges at idle in reverse & stallsVehicle: 2006 Chevrolet Silverado, 6.0
Rich,,Sonnax part # 34200-14k. Had one that would stall the engine after it gothot. Fixed mine.
John Lovell - Preston County Transmissions [email protected] Member Since: 09/12/2007 (1 | 39)
Date: Tue Apr 5 09:39:46 PDT 2011Subject: 4L80E, Vehicle surges at idle in reverse & stalls
Sounds like a worn out pump or restricted cooler. I would put a gauge on it first and see what the pressure does. Robert Moreau Laguna Beach, CA
Robert MoreauLaguna Beach, California [email protected] Member Since: 07/03/2010 (0 | 669)
Date: Tue Apr 5 09:45:05 PDT 2011Subject: 4L80E, Vehicle surges at idle in reverse & stalls
34200-14K is the part number for the line to lube pressure regulator valve. Thiswas designed for the complaint you describe. ( Sonnax volume 8, page 84) This engine RPM fluctuation can also occur in Drive range at idle. What is occurring?Insufficient converter clutch release oil flow. As line pressure increases, converter release is reduced by the valve moving inboard. Generally, if you raise the RPM's slightly this condition is overcome. To diagnose: Use SonnaFlow and check cooler flow at idle. Flow will fluctuate from .2 to .5 gpm. In the initial stages when these trucks were under warranty GM was replacing the radiators and reprogramming to increase idle speed. That did not always resolve the problem and/or it may return in another 20k. Bob Warnke VP of Technical Development Sonnax Industries Inc
Bob WarnkeSpooner, Wisconsin [email protected] Member Since: 09/10/2007 (0 | 7)