1997 CHEVY c2500 5.7L transmission

Asked by Oct 01, 2017 at 03:27 AM about the 1997 Chevrolet C/K 2500

Question type: Maintenance & Repair

I have a 1997 chevy c2500. Single cab, automatic
transmission and 2wheel drive. I did a
transmission filter change. And the fluid in the pan
was a bright red as if it was fresh. Now weeks later
it will go into gear and drive. It won't get out of
second but when I come to a stop it will not move
forward anymore. I have to turn the truck off and
wait 30 seconds before it turns back on. I've
researched what might be causing this. The truck
freely shifts when the transmission won't enter
gears I don't need to press the break to change
gears. The engine also freely revs at this time. It
doesn't feel like it has any resistance. Please help
me, I'm so close to having this monster back on
the road after it's sat for 6 years.

1 Answer

105,385

If it sat for that long the chances are high that varnish formed inside the tranny, changing the fluid and filter added the detergents that were already gone from the old fluid, now the cleaners are doing their job but have broken loose some larger particulates that have found theur way into smaller passages in the valve body and no doubt have caused some problems in the shift solenoids when running under pressure, when you shut the truck off the pressures drop and allow those particulates to drop off until it's fired back up again then it starts all over. Now you can try pulling out a quart of fluid and adding a quart of TransX and then jack up the truck so the drive wheels are off the ground, block it so it won't fall, and make sure there is anything that can be thrown by revolving tires and there are no children anywhere close, and then carefully start it and put it in reverse and let it run a at least 30 seconds in that gear, step on the brakes to stop it, put it in neutral and let it idle for 30 seconds, then put in low gear and take it up 5 mph and hold it there for at least 30 seconds, back off the gas and manually put it in second and 15 to 20 mph and do the same thing, then third and bring the sped up to 35 mph, the top gear and the speed up to 50. Then shut it down and let it sit overnight or longer if your schedule allows, then after it off the blocks take it for a drive shifting it manually to start with, start off in low then shift it to second at 6 mph, then third at 25 and drive at 40, pull over and stop and then pull out and see if it will shift on its own, if not then your going to have to take it too a tranny shop so they can runs pressure and a stand alone testing to see if it is a pressure problem, shift solenoids or a TCM failure. Seems like a hassle I know, but I did what just stated on a rig that would not shift out of low and reverse was barely there and after driving it for a week in short little road tests it started shifting and reverse came back solid, it had sat for 2 years out in a guy's backyard. Sitting is really hard on newer vehicles, and this fuel today doesn't help.

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