Short bed K10 driveshaft angles

[68isgreat]

Originally Posted by pjmoreland

I have a 1989 K1500 shortbed with the stock 350/700R4/NP241C drivetrain and stock ride height. The operating angles of the rear driveshaft are 3° down in the front and 3° up in the rear.

I also have a 1971 K10 shortbed that I am in the process of getting back on the road. I installed an NV4500 transmission and an NP205, but I slid the engine forward 2" to keep the transfer case in the stock location. My rear driveshaft operating angles currently are 6.7° down in the front and 2.7° up in the rear. I believe these angles would be the same on a factory original truck, but I have changed some things, so my angles might be a little bit off. The rear driveshaft is 49" long, center-to-center.

Thank you very much. How long is the driveshaft on the 89? The one on your 71 is 11" longer than mine, which must be how you're able to have a 2.7 degree angle in the rear. I talked to Woods Driveshafts, and they said to drive mine like it is first and see if there is any vibration before changing anything. I haven't driven it yet, but the angles just seem extreme.