mrchev

something interesting. I pulled it back into drive rather than overdrive. Accelerate getting on freeway and it shifts fine into 3rd gear. But doing the same thing in overdrive, it jumps out of gear at around 3K. So, the problem doesn't appear in drive. Afterward, I can shift in overdrive and all is well.

1993 GMC 1500 Same problem after having rebuilt 2 years ago. (it did this issue prior to rebuilding) Guy was nice, but too long to get trans back during rebuild. So, I've been driving it fine for now. But question________ While I am accelerating (getting onto the freeway). First gear is fine Shifts into Second Gear fine. During shifting into 3rd gear, if rpms are above 2500-3000 or above.........the transmission jumps out of gear and revs. Let off the gas and jumps back into gear and I proceed normally. shifting onto 3rd under 2500 rpms it always works fine, no events whatsoever. With cruise on, or pulling a load..........cruise on: going up inclines and the trans has to downshift or going over 2500 rpm.....engine revs (comes out of gear) let off, jumps back in gear. Pulling a load, (car trailer). going up incline......acceleration anything over 2500-3000 pop out of gear. let off and goes back into gear.