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The reverse band adjustment is inside the transmission. The oil pan needs removed to access.
i'm not sure for that transmission, but i know for my trans, (GM 3T40) the band adjustment is the piston itself. if you look at the shaft on the piston, you might notice a couple of lines cut out on it. If so, that's the adjustment.
In old Dodges 1950s to 1980s there was one adjustable band for low reverse and if it needs adjustment its worn out. Newer cars, NO.
There is no manual band adjustment in that transmission. It is self adjusting.
Everything points to the transmission being rebuilt or replaced. The reverse band broke, came loose etc.
No, not likely.
Hand Tight then back off 4 turns - Done
Rebuild the transmission
No. The last transmission GM made with a band adjustment was the Powerglide - gone in 1968, I think.
NO, but you should certainly check the ATF level, and possibly replace the filter. I am no expert on Fords for sure but I do know the early Chrysler 727 tranny's had an adjustable reverse band, look into that get advise from a trans shop more then one opinion as well.
When a Toyota 4Runner will not move in reverse, it could be that the reverse band in the transmission is broken. Another possibility is a problem with a range selector. Both problems would need the services of a transmission expert because the transmission would have to be pulled.