I have a 97 chevy tahoe just replace transmission about 3 months ago. When driving my rpm are high and doesn't change gear only goes 20 miles an hour, scan the truck but no transmission codes come up got a codes 420 and 430. Transmission shop says nothing wrong with the transmission. Please help what do you think it could be
have the same problem?
Wednesday, January 9th, 2013 AT 6:45 PM