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Old 03-18-2007, 09:46 AM
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71 Nova mono to multi leaf question.

Hello Everyone.
It's been awhile since I've posted a new thread. I recently replaced the mono leaf rear springs with an after market multi leaf set and it appears that the new multi leaf springs hold the pinion angle down? Maybe it's me? I noticed this when I started replacing the rear drum brake shoes. It appears that the rear drum backing plate is tilted forward, off center. The wheel cylinder mounting hole is not top center, it has tilted forward slightly and then I noticed the pinion angle is slightly pointing down. My repair manual doesn't have a good picture of the brake shoe replacement process. I measured the front mono leaf bushing with the multi leaf bushing to the center pin and they're very close. Now, I have yet to put the tires on and lower it to the ground. Any info would be greatly appreciated.
Mac

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Old 03-19-2007, 12:50 PM
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Yeah, I'd get weight on it before you jump to any conclusions. Remember the pinion climbs under acceleration too....
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Old 03-19-2007, 05:27 PM
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71 Nova mono to multi leaf question.

Thanks for the reply CamSweet. You're probably right. I'll get her on all fours and see what I've got.
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Old 04-24-2007, 05:09 PM
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pinion angle

I'm going through the same thing with my 69 nova, I've been chasing a horrible vibration at 60mph and above. I'm down to the pinion angle and when I replaced the mono's with multi's it did alter the pinion angle. I had to eventually put a 6 degree wedge in the rear to get everything back to parallel with the transmission. I'm in the process of going back to mono's.
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Old 04-27-2007, 01:02 PM
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pinion angle

Hi sfrymoyer,
Sorry I didn't reply sooner, I've been away. I haven't got my 71 Nova running yet, still fitting quarter panels. I held the rearend in position, removed the muti leaf springs, laid them beside the mono leafs and found the two were very similar in length and center points. I put the mono leaf springs back on and the angle of the pinion was the same as the multi leaf springs. I then went to a friend with a 70 Camaro to look at his stock multi leaf setup and found the Camero rear end has a similar down angle at the pinion, approximately 4 degrees using an angle finder. I mentioned your vibration problem to the Camaro guy and he had a vibration problem between 50 and 60 mph, he found that his drive shaft had a very slight bend near the Muncie trans. Once the drive shaft was straightened everything was fine. Appearently this pinion down angle is normal on these cars as the pinion will raise under normal acceleration. I plan to use the multi leaf springs due to the potential of the mono leafs breaking, (often at the wrong time). Please let me know what you find.
Mac
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Old 12-05-2008, 10:11 PM
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been an even longer time for me. Continued to chase vibration, and finally purchased new front spring pockets for multileafs and it corrected the pinion angle without using wedges. The multi pockets relocate the front spring bolt and correct the angle.
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