i put a 1974 pontica 400 in my 86 iroc along with a 66 th400 and every thing was fine then all of a sudden when its in park i hear a high pitch whining sound but when its in gear i dont hear it any more. butr some times when its in gear the car will just be sitting still. not moving anything but then after a cuple of mins it will move and be fine. what could this be?

maybe fan/alternator belt. If it's loose or worn it could slip and make a high pitched whining sound....

no like i said it only happens when its in park and it nuthing like a belt squeel. i haveing tranny problems not belt problems

i wish it was a belt squeel. but like i said its comeing from the tranny

no one can help out with this?

More likely a pump or L/R clutch pack problem.

i disconected the vac line runnin from the tranny and now it dosnt slip any more and its shifting right. but i still hear this whining/ grinding typ noise it sounds like the starter gear is still engaged with the fly wheel but its not