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Old October 20th, 2008, 09:30 AM   #1
howell_jeep
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Default setting pinion angle

I put a 4" suspension lift (springs) on my cj7 and I need to weld in new spring perches (pads) onto the axle. Does anyone have a link to an article on how to do this?

Do I need to have the body on to do this, or is the frame and drivetrain all that's needed?
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Old October 20th, 2008, 10:28 AM   #2
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Your jeep has a D300? Are you using a CV shaft or just single cardian shaft?

For CV, you want to point the pinion right at the output on the tcase (We usually go about 1-2* below that)

For Single Cardian shaft, you need to set the pinion to the same angle the output is on the tcase. You can do that with an angle finder.
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Old October 20th, 2008, 10:57 AM   #3
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within 3 degrees of paralell is usually acceptable and you wont feel any vibrations, if it is a front I would pay more attention tot he caster angle than the pinion angle.

you should have the springs compressed to a location close to ride height so you dont have to redo something if it isnt right later on.
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Old October 20th, 2008, 10:58 AM   #4
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Quote:
Originally Posted by brimy311 View Post
Your jeep has a D300? Are you using a CV shaft or just single cardian shaft?

For CV, you want to point the pinion right at the output on the tcase (We usually go about 1-2* below that)

For Single Cardian shaft, you need to set the pinion to the same angle the output is on the tcase. You can do that with an angle finder.

Yes, it has the d300 in it and I want to use a cv driveshaft. I have not lowered the t-case. So I would just point the axle pinion at the transfer case pinion (or 1-2* lower) and weld the perches?

Also, do i need to do anything to the front setup? I have just left it the way it was before the lift?
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Old October 20th, 2008, 11:01 AM   #5
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Quote:
Originally Posted by 95geo View Post
within 3 degrees of paralell is usually acceptable and you wont feel any vibrations, if it is a front I would pay more attention tot he caster angle than the pinion angle.

you should have the springs compressed to a location close to ride height so you dont have to redo something if it isnt right later on.
"within 3 degrees of parallel" is that true even for cv driveshaft?

and i was just thinking about the rear axle at this point, I'm putting a fiberglass body on it, so there will not be much more weight added over the rear axle.

do I also have to redo the perches on the front axle? i was under the impression that i only needed to do the rear
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Old October 20th, 2008, 11:08 AM   #6
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I would sugest adding the tub onto the frame, as well as any other normal vehicle weight (top, seats, fuel tank, etc)

You're springs will flex with the weight of the crap mentioned above, which will affect your pinion angle.
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Old October 20th, 2008, 12:02 PM   #7
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Quote:
Originally Posted by howell_jeep View Post
"within 3 degrees of parallel" is that true even for cv driveshaft?
I have no idea if you will see problems or not but typically if 2 u-joints are within 3 degrees of one another you will not notice any vibrations.
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Old October 31st, 2008, 12:37 PM   #8
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this might help.
http://www.pirate4x4.com/tech/billav...ft/index2.html
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Old October 31st, 2008, 12:42 PM   #9
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Quote:
Originally Posted by 95geo View Post
I have no idea if you will see problems or not but typically if 2 u-joints are within 3 degrees of one another you will not notice any vibrations.

cv d shaft

point the pinion 1-2 degrees below the t case output
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Old October 31st, 2008, 12:56 PM   #10
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cv d shaft

point the pinion 1-2 degrees below the t case output
within 3 degrees of pointing directly at the output
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Old October 31st, 2008, 03:08 PM   #11
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Quote:
Originally Posted by 95geo View Post
within 3 degrees of pointing directly at the output

i see what you mean

but when i first read your post and the preceeding ones it sounded like you were saying make the pinion with in 3 degrees of the output of the t case
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