pinion noise

[Shotaro]

I processed the tunnel and raised the engine and transmission. The pinion is above the transformer. "Is the angle correct?"

engine 1.5 ↓
shaft 1.4↑
pinion 0.8↑

[streetk14]

That looks ok to me. Your operating angles are 2.9 degrees and 2.2 degrees and the angles are opposing. I want to say 3 degrees of u-joint operating angle is the max recommended to avoid premature wear, but that shouldn’t vibrate as far as I can tell. I have right around 3 degrees of front operating angle on my car, and it’s nice and smooth.

[Shotaro]

That looks ok to me. Your operating angles are 2.9 degrees and 2.2 degrees and the angles are opposing. I want to say 3 degrees of u-joint operating angle is the max recommended to avoid premature wear, but that shouldn’t vibrate as far as I can tell. I have right around 3 degrees of front operating angle on my car, and it’s nice and smooth.

I think it would be nice to raise the transmission a little more. how is it?

[Z06vet]

I have experienced issues with the drive shaft sloping upward to the rear end. I would raise the trans tailshaft as high as possible. Ride height plays a big part in this. The lower the car, the higher the tunnel needs to be. On almost every build, I end up with the rear pinion close to 0 degrees (+/- .5). No amount of pinion adjustment on my builds was able to fully tune out general business( slight vibration) at highway speeds if the driveshaft slops up to the rear end. After raising the trans, it went away every time.

[streetk14]

I think it would be nice to raise the transmission a little more. how is it?

I feel like it should be fine as it is, but raising the trans higher would be beneficial I think. Ideally, you want the front operating angles equal and opposite, with 1/2 degree or so so the U-joints rotate.

I don’t think it really matters that the pinion is higher than the tail shaft as long as the operating angles are opposite — meaning the angle forms a “V” at one end and a “^” on the other end. This is just theory on my part since I personally haven’t dealt with it.

[Shotaro]

I have experienced issues with the drive shaft sloping upward to the rear end. I would raise the trans tailshaft as high as possible. Ride height plays a big part in this. The lower the car, the higher the tunnel needs to be. On almost every build, I end up with the rear pinion close to 0 degrees (+/- .5). No amount of pinion adjustment on my builds was able to fully tune out general business( slight vibration) at highway speeds if the driveshaft slops up to the rear end. After raising the trans, it went away every time.

Thank you.

[Shotaro]

I feel like it should be fine as it is, but raising the trans higher would be beneficial I think. Ideally, you want the front operating angles equal and opposite, with 1/2 degree or so so the U-joints rotate.

I don’t think it really matters that the pinion is higher than the tail shaft as long as the operating angles are opposite — meaning the angle forms a “V” at one end and a “^” on the other end. This is just theory on my part since I personally haven’t dealt with it.

Thank you.

[Kamikazi]

Thank you.

Shotaro, yours is a very timely post as I’m just beginning to work thru my driveline angles on my ‘72 TransAm after installing a Tremic T-56 Magnum. Really appreciate all the responses & feedback. The TransAm is a challenge due to everything that’s got to stack on top of the motor & flush out exactly with the underside of the shaker opening!

[Shotaro]

Shotaro, yours is a very timely post as I’m just beginning to work thru my driveline angles on my ‘72 TransAm after installing a Tremic T-56 Magnum. Really appreciate all the responses & feedback. The TransAm is a challenge due to everything that’s got to stack on top of the motor & flush out exactly with the underside of the shaker opening!

The Trans Am has a shaker, so you may have a hard time adjusting the angle. 4 link suspension?