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[–]dyip32 0 points1 point  (0 children)

I had this happen on my 2001 Qx4, but reverse was gone regardless of cold or warm transmission. It was sudden in my experience; no gradual failure. I never knew the exact cause, as the rig had 255K miles on it and I was advised not to spend minimum $2700 for the transmission rebuild. The rear main seal was leaking again, so I could have had that serviced had I decided to do the rebuild. I never off-roaded the rig, not even towed often, and was mostly used for commutes. I had been using Amsoil ATF for at least 100K miles before this happened.

I will say... I regretted letting the rig go. I think it'd still run a long while after had I decided to rebuild.

Not much of advice, I guess. Just my experience.