Thread: Mild vibration at speed

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Yes, the universals all appear new, but the driveshaft does not appear to have any weights on it at all, front or rear... is this unusual? As for the tires, I sota have them ruled out, at least for the most part, as the vibration definitely seems worse under load than when freewheeling in gear. The tires are currently radials, brand new BFG's actually. The fronts are spun balanced and the machine read 000 on front and back, so they are not likely the problem, however, the rears are still just static balanced. Think I should go get weights on the front lips too, or do you think its more likely the driveshaft? The engine is a crate 350, a bone stock 260hp, so I'd imagine the banancer is not the issue, although i will say it seems as though it could use some mild tuning, as it doesn't idle quite as silky smooth as I would expect a stock cammed 260hp small block to run. Also, not to sound nieve, but what is runout?