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Author Topic:   Pinion Angle Setup??
460-67Stang
Gearhead

Posts: 289
From: Southern Ohio, USA
Registered: Feb 2001

posted 04-02-2001 09:51 PM     Click Here to See the Profile for 460-67Stang   Click Here to Email 460-67Stang     Edit/Delete Message   Reply w/Quote
I'm installing a 9" Versailles disc rear end in my '67. Everything's ready to bolt in, but I need to know what pinion angle to run at. I've done some research and found the following sites to be very helpful, however they are aimed at the 4x4 truck crowd.....lift blocks play havock with driveline angles:

http://reality.sgi.com/autocad/4x4/CheapTricks/Driveline-101.html
http://www.classictruckshop.com/+4.html
http://www.4xshaft.com/driveline101.html

Thay all basically say that you want the centerline of the tranny output and the pinion to be parallel. This means that since the tranny is angled down about 3 degrees, the pinion should be angled up about 3 degrees. The two andlges would in theory cancel each other out and create a good setup.

However, my understanding is that you want 3 degrees DOWN angle (not UP as described) on the pinion so that when you get on it and the leaf springs wrap up, the pinion becomes closer to 0 degrees to the driveshaft.

Anyone have experience in this area?

Confused (again!)
Brian

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steve'66
Gearhead

Posts: 9555
From: Sonoma,CA,USA
Registered: Mar 2000

posted 04-02-2001 10:14 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Brian,

I have done a few of the big 4x4 suspensions and the extreme angles that they require are not relevant with a Mustang. The basics apply, but in a car you should be able to point the tranny's output shaft at the rear's pinion shaft. If not, then the difference should be split between the two u-joints. As far as the pinion angle it should be set when loaded against the traction bars, pinion stop, ladder bars, or whatever device you are using to prevent spring wrap-up. I don't think it is an issue unless you don't use a traction device to prevent spring wrap-up. In which case you'll blow u-joints and driveshafts daily!

SteveW

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Dave_C
Gearhead

Posts: 1071
From: Gadsden, Al
Registered: Aug 99

posted 04-03-2001 02:01 AM     Click Here to See the Profile for Dave_C   Click Here to Email Dave_C     Edit/Delete Message   Reply w/Quote
As per Dave Morgan in Doorslammers: The Chassis Book:

Leaf springs: 5-7 degrees.
Ladder bars 2-3 degrees.
4 link 1-2 degrees.

With the pinion angle being the difference between actual pinion center line and the driveshaft center line.

BTW, that book that I referenced is *excellent*. Just got it last week. Goes through everything about setting up a chassis.

Later,

David Cole

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Moneymaker
Administrator

Posts: 27660
From: Lyons, IL, USA
Registered: May 99

posted 04-03-2001 08:06 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
I agree with Dave and Dave's assesments. Those are the same formulas that I use.

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460-67Stang
Gearhead

Posts: 289
From: Southern Ohio, USA
Registered: Feb 2001

posted 04-07-2001 10:52 AM     Click Here to See the Profile for 460-67Stang   Click Here to Email 460-67Stang     Edit/Delete Message   Reply w/Quote
David,
I'm running leaf springs, so the pinion angle should be 5 to 7 degrees pointing down not up, correct?

Thanks!
Brian

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Dave_C
Gearhead

Posts: 1071
From: Gadsden, Al
Registered: Aug 99

posted 04-07-2001 05:27 PM     Click Here to See the Profile for Dave_C   Click Here to Email Dave_C     Edit/Delete Message   Reply w/Quote
You want the pinion angle down 5-7 assuming that the driveshaft is perfectly level at 0 degrees. You have to figure in the driveshaft. If the driveshaft is pointing down 2 degrees you would want the pinion to be 7-9. Or if the driveshaft points up 2 degrees then you would want the pinion to be 3-5 degrees. The pinion angle of 5-7 is minus whatever the driveshaft angle is.

The whole deal is so that when the springs bend under max accelleration that everything will line up and be close to 0 degrees. Less pressure and wear on the u-joints and max power to the rear end.

Later,

David Cole

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