Join Date: Aug 2003
Location: Shenandoah Valley
It's not totally unusual to hear minor "pops" and "groans" when jacking a car or truck at only one point from level. Even a new car will make some noise occasionally, even on a lift lifting at 4 points. You learn from experience, which noises can be ignored, which can't.
I suspect, as coolhandzep said, some minor shifting, maybe a slightly rusty bolt "popped" when the bore sleeve through the rubber doughnut moved as the rubber compressed slightly by your jacking under the doughnut on that bracket that helps tie the front of the subframe into the unibody.
Look at the head of the bolt under that bracket, the bolt head that's obscured in the photos. Is it still seated against the reinforcement tie bracket surface? Maybe put a wrench on it and just give it a bit of a pull, not enough to loosen it, just enough to make sure it's still tight, not broken.
While looking at the bolt, look at the floor reinforcement too, see if it looks normal like in your photo.
Hopefully wasn't a weakened rusty floor pan attachment point giving away.
Once a friend had a new '71 GTO, we were often thrashing the cars, and this "Goat" had a propensity to wheel hop. As you know, the Chevelles, GTOs, 442s, etc had a seperate frame.
Well, one day we had a flat. Left rear. Car had a bumper jack, still new spare. WE got stuff out, he set jack, started jacking. Rear bumper and car body went up, frame with exhaust didn't. Noticed tips on left not going up with valance and bumper. Looked, and it was missing two frame to body boltrs on the left rear side, the rear one and the one up at the fender well.
Got a bottle jack in K-Mart (we were in their parking lot changing the tire) and used it and changed the tire after letting car down, then went to his uncle's home and removed same bolts from an old '64 F-85 Station Wagon and put them in until he could get it to the dealer the next week. Put the bolts back in the SW then.
Cured the wheel hop though.
A fine pair ... ... and whatever you do, Have a Safe Trip!
Last edited by CrystalPistol; 11-07-2009 at 12:43 PM.