Question about 1998 GMC Sierra
SHIFTS FINE THROUGH ALL GEARS GOING DOWN ROAD 45 MPH AND ABOVE WILL START TO KICK IN AND OUT OF OVER DRIVE. WHEN STARTS TO DO THAT I CAN LET UP ON THROTTLE A HAIR AND IT WILL STAY IN OVER DRIVE FOR A MIN. HAVE REPLACED TCC SHIFT SOLENOIDS TPS(GUY AT WOULD SAID THAT FIXED HIS DOING THE SAME THING). AT TIMES IT ALSO DOES A JERK IN OD LIKE IF YOU HIT THE BRAKES HARD ENOUGH TO GRAB BUT LET OFF RIGHT AWAY.
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Posted on Jan 02, 2017
You might want to try this if its got a kick down cable unhook it from throutle body and pull it out as far as you can and let it snap back, do this a few of times, sometimes a valve gets hung up inside valve body of trans. and won't let it shift. If that don't help you may have to pull pan to dislodge it if thats the problem. chk. the plug on trans. (Its a 4 wire white plug) with test light with key on to see if there is power down there one will be hot, thats for overdrive, now on top of intake in front throutle body there is a sending unit that looks like a temp. sending unit with a 2 wire plug on it that sends a signial down to that plug when engine gets to temp. to let it shift to overdrive. Maybe this will help, or give you some ideas.
Posted on Mar 02, 2009
first check the detent cable from the trans to the accelorator is is out of adjustment. move the adjuster (((( one ))))) click at a time. mark where it is first then go in the same direction if it gets better keep going till it's right if it gets worse then start at the original spot and go the other direction.you won't need to go too many clicks.let me know
Posted on Nov 20, 2009
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