I just rebuilt a 4l60e in a 97 GMC 2wd. When I installed it it ran great. As soon as it gets to operating temp. I loose reverse. It still shifts into reverse but won't go. I replaced the clutches, seals, steels, sun shell and planitary gears when I rebuilt it.
Is reverse the only thing you loose? 1-2-3-4 O.K
When it gets warm and reverse stops working, put it in manual low and see if you have engine braking.
I think its happening after the rebuild. I feel that if the reverse is the issue then it's the plate that slips from when you clutch down to reverse. So make sure that you get it towed to the shop and get it checked.
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Ya. Everything else works fine.
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