what is the grinding noise i hear when in reverse? on 1996 Honda Accord

having problems with the AT not shifting properly (working on replacing the shift solenoids), and now theres a grinding noise when shifting into reverse...i fear the worse.

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2 answers
possibly...didn't this vehicle get into an accident?
Also , most common problems with those transmissions won't be fixed by solenoid replacement. Use ONLY Honda ATF to avoid more problems from happening sooner and do not flush that trans. only drain and fill 2 or 3 times if needed.