Quote:
Originally Posted by HWYSTR455
I'm on engine # 8 in the driver, and get about 100k+ out of each, and if you look at my crossmember, and the current headers on the car, you would agree that I don't baby that thing. So don't think miles has much to do with it.
I'm not convinced it's frame spread some are experiencing, because it takes a considerable amount to show up like that. It would more show in an alignment than in shroud or oil pan clearnace.
On the shroud, my first thoughts would be the core support bushings are worn, and the bolts were tightened. That would raise the core support up to 1.5 inches or more, and cause shroud clearance issues.
Pan to crossmember clearance, my first thoughts would be due to the engine mounts. I've seen such variations in mounts that cause all kinds of problems, wrong part (box/part swap), poor manufacturing, and incorrect application (cross reference wrong). Think about it, if it spread that much, don't you think it would show up in an alignment? Those front upper control arm mounts would have to move like more than an inch, and that would need like a stack of shims to get right.
Second thought would be trans mount is too high, wrong app again. And that would show up as a vibration, since it would whack out the pinion angles.
Original Poster - Guess we're all still waiting for you to complete the diagnosis as suggested, before we can continue. Have you isolated the area the vibration is coming from yet?
.
|
All of that withstanding, the mounts for early A-bodys do seem to all be of inconsistent quality. I do also have a '74 Oldsmobile with 500,000 miles and the engine still sits where it should in that one, but the Oldsmobile mounts seem to be closer to the original location than Pontiac mounts nowadays seem to be. (Just from what I have seen) I guess it sounds like I was implying that the frame could be spread out severely. My mistake. I should have mentioned that the combination of a "little here" and a "little there" of things like this, the inconsistent motor mount height, the varying tranny mount height, worn axle flanges, bent driveshafts, can all combine together to become a problem caused by multiple things as this, and not one "single" problem.
