I hate to say this but... the most likely problem (statistically) is ATF. Do you check it while running and warmed up on a level surface? [Get some Mercon!] Secondly, you may have a shift Solenoid problem. Let me know if you need the pin numbers for resistance checks.
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auto trans.101 1: check levels by the book, not like engine. RTM 2: check fuses. 3: scan it, or get it scanned. for transmission errors. if car wont move and RPM goes high as foot presses guess that is trans slip. of RPM (engine) does not rise or only tiny, that is lost engine power, total loss. but idle. (can happen)
Are you sure that you are selecting FIFTH or are you selecting REVERSE? A "smart" car will kill the engine if you shift into REVERSE while moving forward, to prevent you from breaking the transmission.
Failure of the Auto clutch or a fault in the transmission box. In both the cases the gear box/trans mission must be checked.
Check the activation of the gear stick to ensure that the requested action is seen on the box or is a failure of the link or electrics.
The weld on the manual lever is known to break loose. First, with the wheels off the ground, with the lever in the park position, does the drive shaft lock in park? If yes or no sometimes, drop the trans pan. I bet the nut on the lever camd loose.
It's either your servo, or your bands. Either way, the tranny needs a good cheap shop repair. I'd just get a warrantied salvage yard tranny if I were you and save a few hundred bucks.
Check your rear emergency brakes. A brake shoe pin could have broke and the shoe locks up in 1 direction. but not the other. The other problem you mentioned could happen, but if it is in reverse the trans shifted.
check you shift silinoids, there located inside trans mission pan on back of valve body. there are 2 of them.swap them with each other,if you have 1st &reverse then you know its one of the siliniods. if it makes no difference then you need to have your trans rebiut or get a new one.
drop back to first gear will not run gears
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