Hi, got a question about driveshaft angle i put a narrowed rearend in my 57 and pinion is over to the right side of chassis by a couple of inches am i going to have issues with u-joints or vibration? thank you

 

As long as the yokes are still parallel to each other, there should be very little vibration and mild strain on the joints. Straight of course, is preferred.

 

We56
Here is a link you can wrap your head around!
DRIVE LINE PHASING
Good luck in your quest.

Heres some more I did a search on our sister forum 48-56
As a general rule, you MUST have a minimum of 1/2 a degree angle on the joints to keep them lubricated. Ideally, it's best to hold the angles at 3 degrees or less for maximum joint life and vibration-free performance. You can run more than 3 degrees, but joint life suffers greatly and you run a greater risk of vibration. You also have to keep in mind when laying out your driveline that the pinion is going to rotate up under load no matter how stiff your bushings and suspension are. Most installers compensate for this by rotating the pinion an extra 1/2 degree to a degree down. This way it will rotate up under load to roughly its ideal angle.

Here's some more light reading about driveline angles with lots of good illustrations:

Free Driveline Assembly Troubleshooting Information

This next one is the official Spicer driveline setup guide and should be considered the absolute authority on the subject:

http://www2.dana.com/pdf/J3311-1-HVTSS.PDF

 

actually on all trucks the pinion is offset to one side. trucks use the same lenght axle shafts on either driver or passenger side, so this puts the pinion off to one side. on cars it is more important to centre the pinion due to the driveshaft tunnel running down the middle of the car. on trucks it doesn't matter if the driveshaft runs down the middle or off to one side.

rgds
Mike