well is it only rpm related or speed related as well?
possibly a drivshaft imbalance. driveline out of location. is everything factory? could be a loose engine accesory a improperly torqued clutch/ pressure plate. bad u joint. bad engine mount/trans mount. rear end off center. start with the easiest things. make sure everthing is torqued properly.
at what rpm is this and have you taken anything apart recently?
Could also be a bent/bad rim or bad tire/balance. Swap the tires/rims front to rear or install your spare in place of one of the rear tires (and then in place of the other) and see if the vibration goes away.
Could also be a bent/bad rim or bad tire/balance. Swap the tires/rims front to rear or install your spare in place of one of the rear tires (and then in place of the other) and see if the vibration goes away.
I dont have a tach but the Higher the RPMs the worse it gets. I took the wheels off put it on blocks and ran it. Same thing. the drive shaft looks to vibrate from what i can see. would we need to buy a new 1 or can it be fixed? Thanks
mark the location of the driveshaft the way it sits right now.... mark a scribe in the driveshaft itself then a mark on the pinion yoke (what the driveshaft bolts to) make sure there is no play in the driveshaft/ transmission outputshaft/ pinion bearing. do this by tugging pushing pulling yanking. whatever you have to do to find any type of freeplay in the components. if all that is good then move onto this step:
make sure the pinion yoke is not bent. unbolt the driveshaft. then proceed to rotate the driveshaft 180 degrees in relation to the pinion yoke. torque to spec. retest the vibration.
this is sometimes the problem....if the vibration still persists. a driveshaft balance weight may have fallen off.
in this case, return the driveshaft to its former location and have a rearend shop balance it out.