2003 mercury grand marquis when shifting from park to drive car wont engage as in it seems to be in neutral slightly rolling forward move shift lever to reverse and it will go into reverse sometimes

SOURCE: 96 Jeep Grand Cherokee wont go into reverse

chheck your tranny fluid. if it's ok, probably need tranny work done.

SOURCE: shifting lever doesnt lock

Likely the shift detent mechanism is broken. It's inside the unit and can be reached by removing the trans pan. It should be just inside where the shift lever goes through the case.

SOURCE: cannot shift into reverse although forward gears all functional

have ur shift linkage bushings replaced....most likely thse are torn or completely broken .. this is common on these models..also on some vw's of the same years

SOURCE: 1995 Chevy S10 Blazer will not go into park.

theres a shift cable if its floor model,linkage for column model.

SOURCE: 1991 Caprice No reverse. Moves in neutral. All forward gears OK.

This is Ron out of Vero Beach Florida. I have been doing trannys for years. The problem you described is caused (more than likely) by a seized clutch pack. Depending on the trans, and your car should be RWD with a 700r4 tranny, there are several sets of clutch packs and at least one band. Automatic transmissions rely on fluid pressure to "engage" the correct set of clutch discs, at the right time , to engage and change gears. I have seen in the past, where a customer parks his car for the evening and the next morning, no move. What happened?? More than likely, a clutch pack was on it\'s way out but cause the car was hot the plates were free, but after cooling, they can weld themselves together and actually "lock-up". In the morning you know the end result. Your tip on "moves in Nuetral" is the give away. Ron