Crunching noise???

Hi I just bought a 99 Grand Prix GTP with 89K and when I tak off it make a popping or crunching sound. What in the world could this be Please help. Thanks so much!!

gears grinding from transmission? I don't know really, but it doesn't sound good.

You might give us a little more information on your problem. Do you it feel through the steering or does it feel like the drivetrain. Is your tranny working OK? Any pull in the steering?







http://i5.photobucket.com/albums/y186/lizzywiz/gtp.jpg
Thrasher CAI, DHP v1.0 PCM, SLP Headers,
3.25 SC pulley, CAIT GMAF, 2.5 DP/Hi-Flow CAT,
u-bend delete, 160 TS, ZZP Stage 1 72mm TB,
TB spacer, MSD 8.5mm wires, Autolite 103,
Goodyear Gatorback Serp. & SC Belt,
Nitto NT555R Drag Radials
1/4 ET: 13.210 sec. @ 104.490 mph
0 - 60 ft: 1.945 sec.