Schantin

iTrader: (6)

Finished installing my Moser 9" on Friday. Have a UMI chassis mounted adjustable torque arm. Noted that the front of the torque arm which attaches to the chassis....the top mount (the actual torque arm) is rotated about 1" forward from the bottom mount(which attaches to the chassis brace). The torque arm is still adjusted to the "stock length" from when I had the 10-bolt in the car. The driveshaft is touching the bottom of the driveshaft safety loop....and this is with the suspension "loaded" on ramps.

Seems pretty darn far out of alignment for the pinion. Wondering if I have to shorten the whole torque arm to get the chassis mount point parallel w/ the front of the torque arm and them adjust it? That would mean shortening the adjustment rods by about 1inch....which seems like quite a bit.

OK, pics worth a thousand words....so here's what I have:

Pinion angle on torque arm. Apprears to be +1 (1 degree to left of gauge). Pic taken from driver side of car.


Farther view of same pinion measurement to show where I placed the gauge


Pinion angle at driveshaft. Measured +4 degrees (4 degrees to left of zero). Pic taken from driver side of car.


Here's the front mount. Note how it appears to be shifted forward on the torque arm attachment point. Is this ok? Also.....check the lack of clearance between the bottom of the DS loop and the driveshaft. It's like 1/16 inch clearance! Hoping that if I get the angle to -2 there ill be more space. Have UMI subframes coming that also have an attachment point at the chassis brace. Hoping that will drop the loop down for more clearance too.


Again, input appreciated. Haven't made an changes et. Wondering if I should wait till the subframes come in?... Any input appreciated. Hoping to have the car driving by the end of the week

Thanks.

35th SS

iTrader: (2)

what is your pinion angle sitting right now?

SS SLP2

iTrader: (8)

Schantin:
please shoot me a PM when you get an answer, as I may miss the post with the correct answer, I need answer to the mount angle also
thanks, Johnny

Grn4fbody

iTrader: (2)

also how are you finding your Pinion angle?

Schantin

iTrader: (6)

When I get back to Williamsburg tonight I'll measure the exact angles + take a pic. Using the pinion angle finder gauge supplied by UMI. Should have those uploaded by dinnertime

LM97Z

iTrader: (4)

After i installed my moser 9" & BMR torque arm, the pinion angle looked way off, but after checking it, came out to -3.5, not bad for an M6 car.

Schantin

iTrader: (6)

Took measurements and added pics to add more information. Again, any input appreciated......mainly concerned about the clearance between the driveshaft and the safety loop......

Grn4fbody

iTrader: (2)

It's way out of adjustment, how spohn told me to adjust mine to get "true pinion angle" was take your measurement of the Driveline (+4) and Subtract the pinion angle (+1) which would make your angle +3, you want anywhere from -1 to -2 MAX if your DD it or just doing street driving.

LM97Z

iTrader: (4)

You may get a ton of currect ways to find pinion angle, now even though its showing it too the left, that doesn't make it + or -, because if you stick the angle finder on the other side it'll show it too the right (if you know what i mean) even if it shows either side L or R of the guage & its angled like this \/ that your measureing with both ends pointing towards the ground @ the joint it should be a N angle, if its like this /\ then its a P angle if this makes sence, so if your at 1 & the driveshaft is going up at 4 with this angle \/, it should be a N 3 angle, this is how it was explained to me from BMR, so if this is wrong, then who knows You will have some say that Pinion angle is in relation to the tail shaft of the tranny too, So bottom line when it comes to true pinion angle IMO, if you ask 10 different people on this, you'll get 10 different answers LOL, so who the hell really knows

Grn4fbody

iTrader: (2)

Yeah I hate that cheap *** gauge, I bought a digital gauge from Dana, which makes it 100 times easier.

bigsticksupra

iTrader: (3)

Mine was like this as well. I have a Moser 9" with the newer UMI tunnel mounted torque arm and PST driveshaft. What you need to do is shorten the top threaded solid mount on the torque arm bracket all the way into the tube. leave the bottom adjuster alone. install and adjust pinion angle. You probably wanna take your measurements off the yoke instead.. this will fix the way the front pivot is pushed forward. As far as the driveshaft, it will not be a problem since when the car is on the ground and the suspension is compressed, the driveshaft will raise up.

Schantin

iTrader: (6)

Appreciate the info. Will shorten the upper torque arm bolt today Unfortunately in the pic....the suspension IS loaded. Hoping that once the pinion is adjusted the driveshaft will be centered in the loop.

SS SLP2

iTrader: (8)

Schantin:
I read the posts,let me know the outcome, thanks for the ride,
(thanks for asking the ?)
Johnny

Schantin

iTrader: (6)

Shortened the upper shaft like you said. Adjusted the lower shaft after. Drivshaft is perfectly centered in the loop now and the front mounts a lot straighter too. Thanks!