Question about 2003 Chevrolet Tahoe

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Tranny slips In the morning we start the tahoe let it idle for 15 minutes at -30 . when it is time to take off it seems like the tranny is slipping. THe four wheel drive light is on but it does not engage also. Any ideas

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Tranny slippage can be caused by several things (each contributes to a varying degree, if at all)

1. cold parts are smaller > > > don't seal properly
2. cold fluid is more viscous > > > don't flow properly
3. bad fluid can cause build-up > > > slow actuators & clog fluid passages
4. worn parts > > > don't seal properly

Result: low fluid pressure pressing on bands/clutches = slippage

The good news: as everything warms up, tolerances normalize, system leaks seal & fluid flows more readily creating enough pressure to keep bands/clutches from slipping excessively (normal operation)

As for the 4WD not engaging, I would be willing to bet the front differential actuator is frozen/stuck (assuming it has worked recently)

Posted on Feb 09, 2009

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