installed new driveshaft, high speed vibration ensues

[notsonic]

i just replaced my stock 2 piece driveshaft with an aluminum 1 piece off a ~98+.

around town its fine, super smooth. feels like the throttle response is improved a lot.

but at highway speeds (i guess 60+, my speedo is still ****ed up) theres a noticeable vibration that varies with rpm. at around 2800rpm in 4th its the worst, theres even some vibration in the rear view mirror.

would rotating the u joint in the yoke really help that much, or should i take it to a shop to have it balanced with new u joints?

i didnt have any vibration like this before with the 2 piece. so its not my wheels or anything.
i never have any luck with parts.

ahha, meant to post in drivetrain, my bad.

[whitdog54]

Re: installed new driveshaft, high speed vibration ensues

make sure every things tightened up and its fitting fine, then i would go have it balanced.

[notsonic]

Re: installed new driveshaft, high speed vibration ensues

hmm the bolts are listed as being 16ft-lbs so its gotta be tight enough. i guess ill try rotating it 180*.

[ssms5411]

Re: installed new driveshaft, high speed vibration ensues

G.M. had trouble with some of their driveshafts due to vibration. The material inside the drive shaft had defects so they recalled some driveshafts, might want to see if a shop can balance it.