built67

it doesn't seem rythmic, but i haven't driven it enough lately to really pick up on a pattern...i've driven it a lot of times after the rear was installed and only the past two times this noise has came up...only on the hw, and like i said if i just jump the rpms up a bit it goes away (and then if i slow down to the previous speed where the vibration happened, it doesnt come back)...this is why im thinking u-joints. that and the fact that the u-joint came apart and the needs got very dirty.

jmd...the trans angle can be found off of the harmonic balancer of the engine? and u just disconnect the driveshaft and rest it on the yolk to see the angle?

I appreciate everyones help. you guys are great! thanks for having patience with me haha

JMD

The harmonic balancer will be the exact same angle as the tailshaft of the transmission, I just find it easier to measure there. You can measure at the trans yoke, but it is more difficult since this yoke doesn't have removable caps.

So long as the gauge or straight edge rests on the flat machined surface of the yoke, you can get a good reading.

Al Nylen

Check the backlash on the the ring and pinion gears. Also; New rear ends need the new side bearings to be (work-hardened) for at least the first five-hundred miles of new operation before traveling highway speeds. Which means you should not drive the vehicle more than 5o mph. Or the rear end will develope a vibration and high frequency noise.

built67

thanks for all of the info guys!