Broken Driveshaft.

[nikk]

yoke

One time I had a slightly bent rear end yoke that shelled out 2 drive shafts before I figured it out.Put a dial indicator on the yoke and turn the yoke.Mine was 10-20 thou. out I think.Put a new yoke on-no more problems.Good luck

[turner]

Hi Nick. What is acceptible run out of a rear yoke???Runnin 7 to 1 in high gear.Thanks.

[nikk]

yoke

I dont know what factory tolerances are but mine was bent enough to really make that needle jump on the dial indicator.It's just something easy to check and rule out.Good luck!

[Jim11h]

Nice to see you doing some research and educating yourself. Taking a persons word on a forum is not always the best way to go. Now that you did some looking Ill tell you my opinion.

In my opinion the numbers you quoted above are what they believe the pinion needs to be at in order to make sure it doesnt over center and they are taking into account some extra security... or extra angle a little.

I run NEW rear bushings and maintain them well and run the same pinion angle in my rearend as I have ANGLE in my motor. In other words I match the two u joints angle so as to not lose HP by having a bind in either or both joints!



My motor is mounted LEVEL at ride height all scaled etc. My pinion is ZERO in the car.

My motor is 1.25 angled down compared to the frame if the frame was dead level. I run the rear of my car a little higher than the front most of the time is the only reason there is any angle.

so you have no wrap in your springs??? reason for negative numbers is when on gas the pinion lifts upward thus making driveshaft level from trans to rearend. if rear of trans is downhill when yoke makes upward movement your past zero and now positive. this is also why its beleived that negative will create more drive due to fact that front of rear is lifting upward and fighting thus pushing tires into ground.

[bankbank59]

ı want new job. good luck. + rep

[motorsports12]

my car did the same thing this year - spit the driveshaft in two and cracked the case on a powerglide trans - what we have found that we are pretty sure was the problem was a snubber above the rearend and on wrap up it caught the snubber and twisted the end off the driveshaft and i suppose slammed the rest of the driveshaft into the transmission putting a lot of pressure on everything in the tranny busting the case - just make sure you dont have something in the way of your wrap up on acceleration - the rearend moves more than you think even on a leaf car

[Dirtrunner35]

this is also why its beleived that negative will create more drive due to fact that front of rear is lifting upward ????????? MORE DRIVE ??? How does it give more drive? I put mine at 7 degrees on pinion angle.

[turner]

Ran last week, and everything worked great. You can see where the yoke has moved in the tranny almost an inch. When i put the longer aftermarket yoke in it, it was almost bottomed out when it was just sitting, wich i did not know. The aftermarket yoke bottomed out on the splines before it hit the tailshaft.Seem to have everything worked out now. I can tell you that if your bushings are in good shape,your pinion will not move up more than a degree or two with a 300 hp engine with a stock 4 link setup from what i have witnessed.