My car seems to shake when its under a low RPM load. (fyi i have an automatic). Ive had this problem for a little while, but it seems to be getting worse and worse. For instance, if i am cruising around 40 MPH and the RPM's are around 1200-1300, my car shakes violently back and forth (not side to side). It goes away if i accelerate harder or let my foot off the gas. It isnt a power loss, and only happens under certain conditions (normally at the begining of a higher gear when the RPMS are low). This WAS causing my exhaust to rattle around, which i had fixed . But I think all we did was fix an outcome of the problem, not the problem itself. Any ideas on what it could be? The shop said it wasn't the tranny mounts, and I don't know what it could be? U-Joints? Engine Mounts? Something with my rear-end going? (i have 87k on the clock right now. stock 342 gears with lsd, with an ls1 driveshaft.)
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