Question about 1990 GMC Rally

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I have a 1990 GMC RALLY VAN 3500. When I put the van in any forward gear it seems as though the emergency brake is on. There is force on the engine as though it is trying to turn the transmission but no results or very little forward motion (like the emergency brake is on). Put it in reverse runs smooth with no hesitation. Pulled the rear half of split drive shaft, jacked up rear, checked for rear end problems, everything appears to be normal there. turned drive shaft still attached to tranny, all gears shaft turns, more freely in one direction than other, not a great difference but noticible. started engine put it in all gears and shaft turned freely. Put everything back together still bogging down and very little forward motion and reverse is fine. Have noticed that lately when I would come to a stop it would feel as though it was still trying to go forward (bogging the engine). This is something I've never encountered and everyone I know who knows anything about cars are clueless as well. Has anyone encountered this situation and if so could you please clue me in on what the solution is, please.

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  • ray0427c May 25, 2011

    exactly what was happening before it quit moving forward. I don't suppose you know the difference between a lock up and a non lock up TC. at this point I have dropped the pan to change the fluid and filter. can see the TC. I'm assuming since it is a 1990 it would be the lock up.

  • ray0427c May 25, 2011

    And would changing the converter fix the problem? Not much debris in the pan considering I have around 148,000 miles in it. small amount metal sludge on pan magnet. enough to cover the magnet. no large chunk, pieces of rings only fine sludge.

  • ray0427c May 25, 2011

    exactly what was happening before it quit moving forward. I don't suppose you know the difference between a lock up and a non lock up TC. at this point I have dropped the pan to change the fluid and filter. can see the TC. I'm assuming since it is a 1990 it would be the lock up. And would changing the converter fix the problem? Not much debris in the pan considering I have around 148,000 miles in it. small amount metal sludge on pan magnet. enough to cover the magnet. no large chunk, pieces of rings only fine sludge.

  • ray0427c May 25, 2011

    Also dicovered there is a solenoid invovled. That invovles several tests to diagnose with the tranny assembled and running. Grrrrrrrrrrr.

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When you say you checked the rear end for problems and things appeared good did you check the rear end internally to see if there is a broken gear tooth or metal in the differential oil.i`ve one were this was the problem(a broken gear) that would get caught and stop the forward motion or make it hard to turn.i`ve also had it were the rear brakes were causing a forward motion problem like your having.the shoes were rotating so far when the drum was turning then apply and lock up until it was put in reverse.just some things to check out.if things were working good with the rear drive shaft removed and the problem starts with it in then the problem is in the back end some where as mentioned above.

Posted on May 25, 2011

  • 2 more comments 
  • ray0427c May 25, 2011

    With drive shaft lose turned rear end at the yoke where the u joints connect with tires on and jacked up everything appeared to turn as normal. removed tire pulled drum all appeared normal there as well. I turned the yoke several times around slowly feeling for lost teeth and noticed nothing abnormal. Seems to turn quite freely in both directions, almost effortlessly

  • ray0427c May 25, 2011

    No. did not open rear end, yet.

  • ray0427c May 25, 2011

    My suspiscions are that the torque convertor may have went bad. I don't know much about bad torque convertors and no one else I know has any knowledge of them either since a bad TC is rare.

  • robert wales May 25, 2011

    if this has a lockup torque converter it could be the torque converter circuit not unlocking the transmission from being in the lockup mode this can give a symptom like this.didn`t think of it till now as i remember some GM cars had this problem that was so bad that when the car came to a stop the motor would stall and if it didn`t when you tried to pull away it was like dragging a house no power.

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