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Well, it's not really a "poor" shift quality, it's trying to lock up. In other words both the in and output sides are dragged down. I did find that in 3 (as opposed to D, which is OD or 4) it does operate but not exactly. when it downshifts into 2nd the sprag is supposed to be overrun (or...

Almost 85k miles ago I put a set of chinese made rotors on a Grand Cherokee. They were much heavier units than the stock one's, quite a bit thicker. The dudes at the parts house measured the factory ones and said, yep, they were original and never been turned and couldn't be turned. The point...

On second read (making sure I understand), by "forward clutch" are you referring to the forward friction clutch pack, or the sprag clutch? I'm hoping against hope (which doesn't look very hopeful at this point) that I am reading the manual wrong, but possibly the sprag clutch is locked up?

So the forward clutch is applied in 1-2-3, but released in 4 and reverse (reverse works fine, so this will give me a hint). I do have the PCM programmed to be more firm, and I can reprogram it in about 5 minutes, but it worked fine for a year, just happened as I was driving down the road with...

What would cause a 4L60-E to entered a tie-up (starts to lock up) condition when shifting to 4th? Is this a common failure mode in this particular transmission. It operates as advertised when the shift lever is in the "3" position. It operates normally in the "D" position as well until it...