pinion angle question

golf4283 · Mar 3, 2008

Ok, so I'm bringing in my Versailles rear-end to have the spring perches re-welded and need to know what the correct pinion angle needs to be for my 66 mustang. I want to have the perches re-welded so I don't have to put those triangle blocks in between the rear and the spring to get the proper pinion angle. Thanks.

jikelly · Mar 3, 2008

Alright, I've just finished measuring my transmission, driveshaft, and pinion angles. I've also read 12 or so different articles on determining you pinion angles. I think this one has the best explanation http://www.vibratesoftware.com/html_...ng angle s:

So here is what I found.
Transmission output shaft is 8 degrees up, according to the article.
Driveshaft angle is 3 up.
Pinion angle is 5 up.

That means I've got a front ujoint working angle of 8-3 = 5.
And a rear ujoint working angle of 5-3 = 2

The difference between the two is working angles is 3 degrees. Everything I've read says that is right at or just outside the limit.

golf4283 · Mar 3, 2008

so I need to have them welded on so that the pinion on the rear faces 5 degrees up?? that doesnt seem too bad. I know the current pinion angle is really out of whack on the versailles.

D.Hearne · Mar 3, 2008

If it was me, I'd leave the perches as is. I did a Versailles swap in a big block 67 Stang and did just that. Worked perfectly. Why spend money where it may not be needed ? As for the wedges, these are easy to use, far cheaper than rewelding the perches. I've had a set in my 89 Ranger's 8.8 now for 4-5 years. With a good jack and an air impact, they take all of thirty minutes to install.

golf4283 · Mar 3, 2008

so you've used the rear-end without using the wedges for the versailles?

D.Hearne · Mar 3, 2008

Yes. I used it "as is" on my 67 Stang.

golf4283 · Mar 3, 2008

awesome. I'm just gonna do that then and save the few bucks. thanks a ton D.hearne. you're a real asset to this board.

D.Hearne · Mar 3, 2008

I too, like jikelly, have a vibration problem after the 9" swap in my 77 Comet. I've changed the pinion bearings (the front bearing was bad), installed a new tailshaft bushing in the C-4 (the old one had too much slack), new U joints, & swapped drive shafts (the one that was in was out of round) But still have some vibes, especially in decelleration. I'm going to next try the angle shims, there's no way I'm going to cut the spring perches back off to change the pinion angle. The wedges are too easy to use to correct that.

golf4283 · Mar 4, 2008

So I decided to get the pinion angle actually set because I don't want vibrations and when talking to my car guy he told me he would do it for 30 bucks. Not bad for taking off the perches and re-welding them. I'll let you know the quality of the work. I'm having the pinion angle set at -2 Degrees

Blue Oval Man · Mar 4, 2008

I just happen to have both an original 68 Mustang 9" and an 80 Versailles 9" on stands in the shop right now and after a quick measurement the pinion angles appear to be the same on both housings. Not to sure on the accuracy of my measurement but it appears the angle is 4 degrees.
David.

golf4283 · Mar 4, 2008

well they had said that they were having vibration issues and I just don't want to have to deal with that at all. From what I have gathered -2 degrees is a pretty standard pinion angle on cars. I might be wrong though.

D.Hearne · Mar 4, 2008

I've got mine set with a degree or two of down angle now and it's got vibes. Setting it down is a drag racer thing, this makes it tilt back into the correct angle when the springs wind up. I think this is why I have vibes on decelleration now, it reverts back to a down angle on decelleration. With the stock setting on that Versailles rear, I never had vibes from it. You'd best leave it as is. You're more likely to not have a problem with the factory setting, leaving it as is, & will likely save you money and avert a problem you're going to create needlessly. But it's your money. Don't say I didn't warn you.

golf4283 · Mar 4, 2008

Ok then I'll leave it at stock if thats what you guys suggest. Let me e-mail my guy.

C0V3R · Mar 5, 2008

Golf make sure you measure everything before you set it arbitrarily at -2 degrees. You leafs may alreay point it up in the air or toward the ground. You need to measure the angles in car and then work out what needs to change from there.

golf4283 · Mar 5, 2008

I am no longer having the angle changed on the rear-end.

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