z28 justin

Alright so I've had some decent vibration at about 65mph and up since I got my S60 and new driveshaft. I want to make sure I have the pinion angle correct before I take the driveshaft in to make sure it's balanced (it was supposedly balanced when installed). I'm having helluva problems trying to read this digital angle finder for some reason.


I measured my transmission angle from the harmonic balancer (looking from the passenger side)


I measured my pinion angle from where the U-bolts hook up (again looking from the passenger side)


If my transmission is at a -5.4* and my pinion from the same side is a -3.4* do these give me a total difference of -2*?

Would it be better for me to zero the angle finder on the harmonic balancer and then adjust the pinion angle to -2 from that or am I at the correct setting already?? Any help would be much appreciated guys. Thanks.

98hc4mula

iTrader: (5)

yes that is correct. the reason is because the pinion is pointing down. and the tranny as well. so the angles are going in the opposite direction. so you are correct at substracting:
3.4-5.4= -2*
did you get new wheels? are they balanced? I would also check the DS if you still have the vibration like you said.

good luck man.

99MUSTANG5.3L

Correct me if I'm wrong but I thought the pinion angle was supposed to be a positive angle and the trans waas supposed to be a negative angle? In other words the trans points down and the pinion points up?

z28 justin

It depends on your point of relativity, which is what's throwing me off so much

98hc4mula

iTrader: (5)

the tranny is pointing towards the floor. the snout of the differential is pointing towards the floor therefore when you accelerate, it will move upwards towards the ski, that is why you set it at about -2. the angles form a V if they were to join
does that make sense.

Low N Slow

iTrader: (4)

Here you go, if your tranny is pointing down your pinion should be pointing up at the exact same angle.
The drive shaft angle should be 2 degrees or less and less than .5 degree difference from front to back.

z28 justin

So with a -1.7* angle, I got rid of about 65% of the vibration. It's still fairly loud though. Is this just how tunnel mounted torque arms work? I'm going to get my driveshaft high-speed balanced next week and will report back if that helped.

98hc4mula

iTrader: (5)

tunnel TA are loud compared to the traditional mount bc of the point of attachement to the chassis. Im glad you were able to get some improvement.
report with your findings since a lot of people have this problem with vibration.
laters

z28 justin

I got the driveshaft balanced at a Fleet Pride in town, took the car back out and it was sooo much better. I'd say it's like 99% better. I can get it above 80 without it feeling like it's going to rattle apart. Still pretty loud, looking into fabbing a piece of rubber to put between the torque arm mounts and the body.