The Mopar Performance suspension manual. That and because I said so. lol We're not talking about working angles of the u-joint here. That's different and dependent on what the angle of the transmission output shaft is. This is the angle of the pinion center line as related to the spring perches. Lots of people confuse the two.
Thank you. I believe what your saying is correct as it is similiar with other resources I have read. Unfortunately, the pinion is weled 8 degree's up from reference of perches. And that is incorrect. Well, I will yank the 8.8 from the barracuda which is setup correctly and hide this rear in under that car until I can pull it and do it again.
Well, it MIGHT be correct for "whatever" application it WAS in. Not everything is automatically 5 degrees down. Most older Mopar applications are. Again, you may be confusing pinion angle with U-joint working angle. In other words, have you actually MEASURED the relationship between the spring perches and pinion centerline? You cannot just "climb under" and measure it static on the vehicle, since the spring perches are probably not plumb and level. Understand?
I can not. My drive way slopes down hill quite a bit. The rear tires have blocks preventing it from rolling down hill while the front end is on Jack Stands under the K Frame and A pillars. I was trying to be pro active. Figured set the pinion angle using my digital angle finder and set the perches to 0 degrees. Then weld. That sounded easy enough. And would minimize the time the rear end is up with less safety issues on the hill. More so, since I am not on flat ground, I dont want the car way up in the air. Up high enough to get the axle in, then get the car back on the ground.
Whether the vehicle is on level ground or not hasn't a thing to do with pinion angle or working u-joint angle. You can flip the car upside down and take the measurements and come out with the right figures. That is, IF the suspension would remain in the static loaded position. Sticking an angle finder on the pinion with the rear end installed in the vehicle is not reading the actual pinion angle as related to the perches. That's the point I'm trying to get through.
Well of course it's not. One is big bolt pattern the other is small. Other than that, I THINK they're the same. @Charrlie_S can lay it on us if they're not.
I understand that now. Then the question is, what is the angle in reference to the perches? Could the 8 degrees measured from my barracuda be correct?
Yes the obvious is the bolt pattern change. And maybe the brakes, but backing plates can be swapped to match the car installed on.
I should have elaborated as the context of the question was regarding geometry. I am pulling off a small bolt pattern rear on this 1973. I am not concerned about the bolt pattern size as the intent is to goto large bolt pattern ford 8.8. What I was trying to ask, the housing sizes, perch locations, and pinion degree as compared to the perches.
No you don't understand. For the third time. The angle in reference to the perches is 5 degrees nose down.
Your right, I dont understand. I am so confused and I am at the point of giving up until I can get a job and pay someone to do this.
I don't know how else to explain it and I've told you which publication to get. Anyone who owns a Mopar should have the MP engine and suspension books and I don't understand why everyone DIGS IN when I suggest that. It's almost as if people don't want to learn.
The pinion on a stock A body rearend points upward 5* relative to the perches.
You know what? I think you might be right, in which case I humbly apologize.
