Pinion angle
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From: St. Peters
Pinion angle I have recently installed a spohn torque arm, the one which makes the trani mount obsolete. I have set the pinion angle at -2, I measured it from the top of the pumpkin on my 12 bolt moser. Is an ok place to find the correct pinion measurement?
Yes! Let's hear some info. I have done searches and heard many different things. Can someone slap some informative pics up for us to see? I still have to adjust mine correctly, but have been too lazy.
here's how i do mine. pics are from my old 86TA i used to have. Checking pinion angle. You take the driveshaft angle, in this case 4* left of 0*, and subtract it from the pinion angle. BMR suggests for automatic cars 2* difference. Pointing the pinion downward from the driveshaft. So, in this instance, the pinion angle will be set at 2* to the left of 0*. That makes the pinion angle -2*. All these measurements were taken from the driver's side.
driveshaft pic. took the pic from the right side so you could see the angle gauge.
driveshaft pic. took the pic from the right side so you could see the angle gauge.
you could take the pinion angle measurement off the yoke. make sure where you are measuring on the yoke is flat bottom. if it's left/right of bottom, it'll make it hard to read. that's why i used the torque arm mount flange.
So we use the angle base tool and measure the driveshaft angle, and then put the angle tool on the base of the pumpkin, such as the torque arm mount itself and adjust it until it is 2* lower, correct?
Say if the DS angle measures 6* to the left of 0*, then we adjust the torque arm until the pumpkin mount reads 4* left of zero, right? I think I got it, but I'm just looking for assurance.
Thanks!
Say if the DS angle measures 6* to the left of 0*, then we adjust the torque arm until the pumpkin mount reads 4* left of zero, right? I think I got it, but I'm just looking for assurance.
Thanks!
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Originally Posted by mrr23
correct. you'll want the yoke about 2* lower than the driveshaft angle. when you start turning the adjuster, you'll see the pumpkin start to rotate downward.
Matt
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Thread Starter
12 Second Club
Joined: Aug 2005
Posts: 109
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From: St. Peters
Thanx for the info, I have mine set at 2, but when I rap it up a bit, I can feel it bind. Just a smidge, granted half throttle but should I drop it down a little more? maybe to -3 or -4????
I always measure my angle off the crank and make sure my driveshaft is dead on the crank centerline so that everything is perfectly lined up.. I put the angle finder flat on the crank balancer and take the measurement, lets say on my late model stock car the angle is .7 degrees down then at no pinion angle in the back the face of my yoke should read .7 degrees down and then i move it down or up depending on where i want it to be . I do the same thing to my drag cars and it has always worked great for me.
well, it'll put undue stress on the u-joints. and yes can cause vibrations. some things to check and verify:
does the steering wheel shake when this happens?
do you feel it in the seat?(these determine front or rear)
does it only virbrate on acceleration? (driveline angle)
is it always at that speed regardless of what gear you are in? (wheel,tire)
does it happen at a certain rpm regardless of what gear you are in? (may not be noticing that) ( engine, torque converter balance issues)
get it up to the point where it vibrates. then take it out of gear (neutral) this will tell you if it's drivetrain or other. by taking it out of gear, you relieve the drivetrain of torsional stress. if it goes away, it's in the drivetrain (crankshaft, trans, driveshaft, rearend). if it stays, then it's body (tires, balance, bent wheel, suspension).
does the steering wheel shake when this happens?
do you feel it in the seat?(these determine front or rear)
does it only virbrate on acceleration? (driveline angle)
is it always at that speed regardless of what gear you are in? (wheel,tire)
does it happen at a certain rpm regardless of what gear you are in? (may not be noticing that) ( engine, torque converter balance issues)
get it up to the point where it vibrates. then take it out of gear (neutral) this will tell you if it's drivetrain or other. by taking it out of gear, you relieve the drivetrain of torsional stress. if it goes away, it's in the drivetrain (crankshaft, trans, driveshaft, rearend). if it stays, then it's body (tires, balance, bent wheel, suspension).
well i put qa1s and spoon tq arm and sub frams rest is in post but it started when i put the 9 inch with all the suspention and yes it starts at 60 and wont go away even if i take it out of gear .... why would it not be the shaft it still spinning.. we found that the pinion angle is off but apparently they fixed it but there is still a bad vibration.. is that just the new tq arm??
it's still spinning. but, there's no stress being applied to it. free wheeling. like pushing the clutch in a manual trans.
with it being there with it out of gear, i suspect something in the rear end as you said it started after you put the 9" in.
do this, put the rear up on jackstands. have someone get in the car. put the car in gear and accelerate to the point where the vibration occurs. look for the wheels to be wobbling around (side to side, up/down), if you can see under the car, look for the driveshaft to be wobbling (doubt this because it stays when in neutral).
with it being there with it out of gear, i suspect something in the rear end as you said it started after you put the 9" in.
do this, put the rear up on jackstands. have someone get in the car. put the car in gear and accelerate to the point where the vibration occurs. look for the wheels to be wobbling around (side to side, up/down), if you can see under the car, look for the driveshaft to be wobbling (doubt this because it stays when in neutral).
two different sets of tires only or tires and wheels? this will eliminate the tires and wheels being suspect. doing the jackstand thing will let you know if there is a bent axle or if the bolt pattern wasn't drilled in the center like it's supposed to. and yes, i've seen that happen. the bolt pattern was drilled offset of center and allowed the wheel to move up/down.
