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Old 10-05-2009, 01:52 PM
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70 nova traction bars, leaf springs. HELP!!!!

I have been so confused about this for a while now and have tried to find the right answers but really have not found much so far. I will try to be as specific and detail oriented as I can so as to avoid confusion. I know the awesome people on this site will be able to help me out I also have included pictures

I have a 1970 Nova I have been building from a bare body for a while now. I got my rear together and am ready to put it in with comp engineering traction bars in place of the original bottom plate. The axle tubes have mono leaf perches and I have multi leaf springs (which I am beginning to doubt are actually Nova springs). I understand that to do this I would need to put steel plate in between the perch and bottom plate/traction bar. With that said when I went to go put the rear on top of the leaf springs I noticed A: there is no hole for the centering bolt in the center of the perch, it is simply flat against the axle tube. B: there is a hole located BEHIND the axle tube that fits the bolt. So i positioned the rear that way, having the bolt on the spring go through the hole on the perch located behind the axle tube. Taking a step back and looking at the wheel well it did look as though the axle was a bit off centered in the well, more towards the back. I assumed that when everything was together and weight was on the spring it would look more centered. However, when I went to put on the traction bar, it would not line up. There is a hole in the center of the plate on the traction bar for the bottom "nub" of the centering bolt to fit in and four holes (one in each corner) for the u or J bolts. Because my centering bolt is located towards the back of the perch, when i position its bottom "nub" into the center hole of the traction bar plate it leaves the other holes misaligned. Meaning, if I were to put a U bolt through the perch, its would not hit its corresponding holes in the bottom plate. In order to fix this I would need to drill out a new hole in the plate for the nub about 1 3/4 inches forward. Sounds good? Nope, if I did this than the rubber snubber would not sit under the spring eye. (I have double checked the part numbers to make sure these are correct for this car) So I am left wondering If i have the wrong perches, the wrong springs or what? It seems that if the centering bolt would be able to sit in the actual center of the perch everything would be fine. The plate would line up. But the hole it is in is the only hole on the perch and I can not drill a new one in the center because it is right up against the axle tube. WHAT IN THE WORLD IS GOING ON HERE? Does anyone have any advice? I was also hoping someone could take pictures of their 68 and onward Nova Leaf springs and perch so I could see how theirs go together (centerin bolt and all) I hope this wasnt too long winded or confusing and I really appreciate any help I could get. Thanks so much in advance PLEEEEASE help .
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Old 10-06-2009, 02:52 AM
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As you have found, there are differences between monoleaf springs and perches and the same parts for multileaf springs.

The perches are different in that #1- the depth is different(shallower) than a multileaf perch, and #2- the perch for monoleaf springs doesn't have a centered locating hole for the spring centerpin. This is due to the fact that the monoleaf spring has no center pin, it has a forged-in nub that is not centered front-to-rear on the spring. It is closer to the front spring eye

Only two ways to fix this. One is to carefully drill the existing perch to accept the center pin. A Mill or drill press is the best idea here, but it has been done carefully with a hand drill and Dremel tool.

The other option is to order the correct weld-on spring perch, whether aftermarket style or factory style is up to you, cut the mono perches off the axle housing and weld the new multi perches on. I would go this way if I was going to put serious power into this rear set up, like 500+hp, the new perches are much stronger than factory.
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