I just had a local guy install my new Strange Dana 60 and custom Strange driveshaft. Now instead of the annoying gear whine from the stock 10bolt, I have a pretty decent vibrate from 75+MPH. The vibration gets worse when I let off the gas till it slows under 75. Doesn't matter what gear I'm in. Does this sound like an improperly balanced driveshaft?

 

Did he adjust the pinion angle?

 

I don't know how he would. My control arms are not adjustable. I have some bolt in relocation brackets and UMI non-adjustable control arms and non adjustable panhard bar. Everything else is stock suspension-wise

 

If you are still useing the stock torque arm, the pinion angle is probably off. I didnt really think you could use the stock TA with the S60. I guess I was wrong. I would start off checking the pinion angle and go from there.

 

It really sounds like a pinion angle problem.

And pinion angle is adjusted with the torque arm only. The LCAs, LCA relocator brackets, and panhard bar have nothing to do with pinion angle at all.

 

I was under the impression LCA's helped with the pinion angle as well. Shows what I know. Looks like I'll be dropping another chunk of cash for an adjustable torque arm. Anybody using UMI's kit with the relocation bracket and driveshaft loop?

Edit: Let me ask this, does anyone know of an adjustable torque arm that will bolt right up to the S60 without needing modified at all?

 

Yes, that is what I am running. I had to cut the outer 2 bolt holes off of the top of the TA bracket. It will make sense when you see it. Other than that every thing works great.

 

Alright so I finally found some time to get under my car and attempt to measure the pinion angle. Did I do it right, if not, anyone got any tips to do it right?

Basically I stuck the magnetic angle finder on the bottom of the driveshaft and it measured +3degrees. I couldn't get a good way to measure the pinion flange itself and I read somewhere to measure the torque arm itself so that's what I did. Where the TA bolts to the axle I stuck the magnetic angle tool and measured +2degrees.
I made a mock-up doodle and took a couple pics.







Am I way off on my measuring or is my pinion angle only 1degree off?

 

Bump for some input, I know many of you have measured this before did I do it correctly?

 

I can't tell from your diagram how you are reading the level. The angles have to be such that the pinion and the driveshaft form a "\/" pointing down. That way, under heavy torque, the pinion nose will rise up and the angle will approach "0". You have a 1* difference, but its hard to tell from the sketch if the "\/" is pointing up or down.