Which transmission does your truck have?My first guess would be a 4l60e. And a common problem with these is for the sprag clutch to wear out. This sometimes will allow the vehicle to be shifted through the first 2 gears manually, but disables automatic shifting. Or it could possibly be a valve body problem, either way, it needs the love and care of a transmission repair facility. And depending on the mileage of the truck, they will most likely tell you that the transmission needs a full rebuild, instead of just repairing the problem. Which makes sense, as you only want to disassemble it once.
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Tuesday, October 27th, 2009 AT 8:05 AM