driveline vibration craziness

[jungsoo726]

hey guys, i recently added a Dana 44 with detroit locker and put 4.88 in front and rear on the 44 and stock dana 30.

first off, ive noticed large clanking sounds when shifting gears. ive been told it's because of the locker. is this true?

also... recently as of yesterday, ive noticed horrible vibrations when driving between 0-50mph. it's really annoying and it's not like its a soft vibration. it shakes the whole truck.

any thoughts? what could it be? ive got the SYE and longer drive shafts. so i dont think it's that. could the locker be f'in up?

[Fred]

Clanks and clunks are the locker unloading. Thats normal. The shake and shimmy could be worn parts or bad driveline angles, even though you have an SYE doesn't mean its the end all be all. Take a few pictures of your drive shaft at both ends and post them. Also check torques on all the major front end parts. Also check bushings for wear, check ball joints, ujoints, and bearings for wear. Probably the most important part and most common cause check you front and rear track bars for wear and propper adjustment

[Jeffb_79]

You've got an sye, but what are your actual drive line angles?
Here's how to check:
http://www.stu-offroad.com/axle/pinion/pinion-1.htm

If you're drive line angles appear good. Next I'd remove the front driveshaft, drive around and see if the vibes are still present. If not, it's something in your front driveline... be it a poorly balanced shaft, u joints, centering ball, etc..
If so, put the front shaft in and remove the rear. Drive around and see if the vibes are still present.