I replaced the transmission speed sensor but did not help. It is not slipping at all.
Fluid and transmission filter replacement. If the truck has lots of miles without a service done on it, a fluid service is the way to go.
Check the vacuum modulator and the hose going to it. Also check for vacuum leaks on or around the engine. Have you checked the fluid level or changed the fluid in the transmission? How about the throttle position sensor? (if it has one).
SOURCE: 1998 gmc 2500 transmission
unfortunately if it is brown rusty color you have a serious problem! this usually occurs once you have burned up the clutch plates with in the core of transmission! honestly I do not aim to discourage you but your probably going to have to eventually change this transmission! if you have a strong aroma from the dip stick it is burned up!!!! I have change plenty of these over the years due to the same circumstances.Good luck and hope that it all works out for you,John
SOURCE: 1993 chevy 1500 4x4 4l60 transmission automatic shifting problem
Could be a shift selonoid,I would recomend taking it to a shop and have a scanner hooked up to it.
SOURCE: speedometer doesn't work and transmission wont shift
Hi, make sure you check the speed cable that runs to the engine, it may be severed. As for the tranny, you have some major gear problems that will require pulling this transmission for a deeper look. i would have a look at the transmission filter as well.
SOURCE: shifting hard replaced transmission speed sensor
check trany codes,fluid level to high low,quality red is the favored color
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