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 Post subject: Pinion Angle
 Post Posted: Fri Feb 23, 2007 12:10 pm 
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Deacon Dr. Brown Valentine
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Hey what is the pinion angle for a stock TJ?

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 Post Posted: Fri Feb 23, 2007 2:12 pm 
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< 0

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 Post Posted: Fri Feb 23, 2007 2:18 pm 
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Deacon Dr. Brown Valentine
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so for every inch of lift do you know what it changes?

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SYE, 2" Suspension Lift, 1" Body Lift, 31 x 10.5 work week (33x12.5 playing)
Brush Grill , T-Max 10k HD Winch
150watt 380,000/each candle power driving lights


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 Post subject:
 Post Posted: Fri Feb 23, 2007 2:27 pm 
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skidbrown wrote:
so for every inch of lift do you know what it changes?

No...that was supposed to read "greater than 0" in other words...i was being a donkey

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'78 CJ7 project....350, NV3500, NP241, fiberglass tub, show and shine
'72 Oldsmobile Cutlass convertible - the family fun car
'05 Chevrolet 3500 dually, duramax, stock
'05 Honda Odessey awesomevan
'08 Chevrolet HHR company car - The silver bullet

Whatever....


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 Post subject:
 Post Posted: Fri Feb 23, 2007 2:29 pm 
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skidbrown wrote:
so for every inch of lift do you know what it changes?


But i've heard some things....like you'll be fine if you have no more than 7 degrees of difference between the u-joint angle at the top of the driveshaft vs, the angle at the bottom (pinion) of the driveshaft....i always just point the dang thing at that output of the tcase and let it be....

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'78 CJ7 project....350, NV3500, NP241, fiberglass tub, show and shine
'72 Oldsmobile Cutlass convertible - the family fun car
'05 Chevrolet 3500 dually, duramax, stock
'05 Honda Odessey awesomevan
'08 Chevrolet HHR company car - The silver bullet

Whatever....


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 Post subject:
 Post Posted: Fri Feb 23, 2007 2:33 pm 
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Particle Man
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Chuck wrote:
skidbrown wrote:
so for every inch of lift do you know what it changes?

No...that was supposed to read "greater than 0" in other words...i was being a donkey

But you wrote "less than" 0.

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 Post subject:
 Post Posted: Fri Feb 23, 2007 2:34 pm 
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Deacon Dr. Brown Valentine
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the problem is that a friend put in a cherokee axles in his ranger after blowing the rear end. he was wanting to know what he could get a way with.

http://www.zabeard.com/vids/Zach%20Stuck%202.wmv

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skid => '97 Jeep Sport
SYE, 2" Suspension Lift, 1" Body Lift, 31 x 10.5 work week (33x12.5 playing)
Brush Grill , T-Max 10k HD Winch
150watt 380,000/each candle power driving lights


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 Post subject:
 Post Posted: Fri Feb 23, 2007 3:18 pm 
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Jeeper in IN
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Chuck wrote:
skidbrown wrote:
so for every inch of lift do you know what it changes?


But i've heard some things....like you'll be fine if you have no more than 7 degrees of difference between the u-joint angle at the top of the driveshaft vs, the angle at the bottom (pinion) of the driveshaft....i always just point the dang thing at that output of the tcase and let it be....


That only works for a Double Cardan style shaft. You want to keep the angles as close to equal at both ends so that the u-joint vibrations cancel each other out. The farther you go from that, the more vibrations you are going to get. Either raising the motor up, or lowering the transfer case lowers the angle of the tcase output, allowing you to turn up the rear axle to match the angle. Best bet is to set it up as close to this ideal situation as possible, if you have vibes, you need to set up a double cardan style shaft.


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 Post Posted: Fri Feb 23, 2007 9:11 pm 
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mister wiskers
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YJ-Type-R wrote:
Chuck wrote:
skidbrown wrote:
so for every inch of lift do you know what it changes?


But i've heard some things....like you'll be fine if you have no more than 7 degrees of difference between the u-joint angle at the top of the driveshaft vs, the angle at the bottom (pinion) of the driveshaft....i always just point the dang thing at that output of the tcase and let it be....


That only works for a Double Cardan style shaft. You want to keep the angles as close to equal at both ends so that the u-joint vibrations cancel each other out. The farther you go from that, the more vibrations you are going to get. Either raising the motor up, or lowering the transfer case lowers the angle of the tcase output, allowing you to turn up the rear axle to match the angle. Best bet is to set it up as close to this ideal situation as possible, if you have vibes, you need to set up a double cardan style shaft.



Also, set the yoke at the diff 2 degrees lower, to compensate for the pinion wanting climb the ring gear.

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