? about pinion angle - Lateral-g Forums

rallye455 · #1 07-30-2008, 08:28 AM

I have a GM A Body (72 442) and am doing a body off resto and purchased a Moser Fab 9 housing for it. I have the bare frame stripped and bolted the rear in today and the face of the housing is tilted back at 87.7 degrees. Can anyone tell me what the angle of their housing is?

68protouring454 · #2 07-30-2008, 09:45 AM

alittle confusing, but it sounds like you have 2.7 degrees of pinion angle and the pinion is pointing up, which it should point down 2-3 degrees
do you have adjustable uppers? there jig may be off alittle needing adjustable uppers

The WidowMaker · #3 07-30-2008, 12:11 PM

it all really depends... 87.7 to what? the ground? the frame? the tranny?

throw all that out the window. set your pinion equal to your tranny in degrees whether the same or opposite. then measure you driveshaft and fiqure your working angles. you need to set it all up so your working angles are as close to 1 as possible (without being less than one) and are within .5* of each other. a perfect setup would have a front working angle of 1 and a rear of 1.5 or less.

you can move your tranny up or down and you can do the same with your pinion yoke. currently, my setup is requiring a 2.5" spacer (read new crossmember) to get my angles correct at my ride height.

Tim

dhutton · #4 07-30-2008, 12:20 PM

Is it valid to measure the pinion angle on a bare chassis? Doesn't the suspension need to be fully loaded and at ride height before worrying about this?

Don

rallye455 · #5 07-30-2008, 02:25 PM

I dont have the motor or trans mounted...just was mocking up the rear and noticed it was leaning up..put an angle finder on it and it was 87.7 degrees..frame is level..stock control arms...I was just wondering if that seemed normal or was the Moser housing off....I'm not looking to set pinion angle now, just worried that the rear may be off..I figured it would be pointing down, not up.

ironworks · #6 07-30-2008, 03:14 PM

The links are so short that when you put the weigh on the car on the frame it will compress the suspension and probabley get you into range. The pinion angle only matters in relation to the angle of the engine. Until you have the car setting on all it's own weigh, there is no reason to even take a guess.

Good luck