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-   -   My Front Pinion Angle (http://www.risingsun4x4club.org/forum2/showthread.php?t=8000)

Bikeman 08-24-2008 06:27 PM

My Front Pinion Angle
 
My pinion angle is 4 degrees after caster correction. I am concerned that the DC drive shaft I am having built by Front Range will not be vibe free.

Does the pinion angle absolutely have to be an ideal zero for a DC shaft to work, even with the high-pinion diff?

Red_Chili 08-25-2008 08:01 AM

4 degrees might be pushing it, I assume you have full time 4x4? Check the angle of your front companion flange, you might actually be better off without a double cardan. Usually though that angle is way off, which is why the factory uses the DC/CV at least on minis.

nuclearlemon 08-25-2008 09:08 AM

4 degrees will be too much, but you don't have to be a perfect match. you should be within a degree or so...i think the most i've gone was just under 2 degrees.

Bikeman 08-25-2008 11:36 AM

Well I measured wrong. What a learning experience. At the pinion, the u joint is operating at 8 degrees and at the tcase it is 16 degrees (the driveshaft angle is 12 degrees). To make things worse, the DC taco drive shaft I got from the junkyard is bad. So needless to say, front Range is making me a whole new shaft with a DC that will operate all day at 22 degrees if necessary. I hope this works. I knew going into more lift, these things can happen.

Red_Chili 08-25-2008 11:58 AM

You still have that front pinion angle to worry about.

rover67 08-25-2008 05:56 PM

how much is that shaft setting you back?

Bikeman 08-25-2008 08:08 PM

4 bills. There goes my Bilstein money.

Red_Chili 08-26-2008 08:39 AM

Quote:

Originally Posted by Bikeman (Post 84220)
To make things worse, the DC taco drive shaft I got from the junkyard is bad.

What was bad about it? U-joints (rare)? Or the cardan joint itself?

Bikeman 08-26-2008 10:26 AM

The center pivot within the cardan joint has come apart and is binding.

I will remove the caster bushings and go back to stock if necessary to get a little more pinion angle if I get vibes with the new shaft. I really need to get a caster measurement done.

Red_Chili 08-26-2008 10:33 AM

Looks like the old cut&rotate is the best solution. I know you didn't want to hear that... but there is a local guy who will do it affordably and well if you gut the housing and pull it (no mean feat on an 80), and tell him EXACTLY what your angles are and what you want them to be. If removing the caster bushings works great (but doesn't steer great) I bet you could just take your measured caster vs. factory spec and he could make it happen.


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