drive line vibes
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Senior Member
Joined: Feb 2010
Posts: 681
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From: errrvre where
Year: 1996
Model: Cherokee
Engine: I6 4.0L HO, JBA headers, 99 intake, #703 injectors
drive line vibes
hhey guys..
whats the worst that can happen with drive line vibes.. i have a 96 with a 6" lift and 1" tc drop with a 4 degree shim from previous lift.. i recently went up from 4.5" to 6" with a lift shackle and it gave me drive vibes.. i know an sye is the way to go but its turning into winter up here and getting colder.. can anything bad happen because of the vibes? broken driveshaft, tcase mounts, tranny mounts.. ? anything at all. i dont have a garage to do an sye or change my axle degree in. and this is my dd/ww i dont do much heavy wheeling or long drives.. mostly within a 50 mile range..
whats the worst that can happen with drive line vibes.. i have a 96 with a 6" lift and 1" tc drop with a 4 degree shim from previous lift.. i recently went up from 4.5" to 6" with a lift shackle and it gave me drive vibes.. i know an sye is the way to go but its turning into winter up here and getting colder.. can anything bad happen because of the vibes? broken driveshaft, tcase mounts, tranny mounts.. ? anything at all. i dont have a garage to do an sye or change my axle degree in. and this is my dd/ww i dont do much heavy wheeling or long drives.. mostly within a 50 mile range..
Thread Starter
Senior Member
Joined: Feb 2010
Posts: 681
Likes: 1
From: errrvre where
Year: 1996
Model: Cherokee
Engine: I6 4.0L HO, JBA headers, 99 intake, #703 injectors
yyay.. what degree shim can i use with a 4.5 inch lift pack 2 inch shakle and a 1" tc drop.. i have a 4 degree shim with 6 inch lift.. can anyone figure this out for me please?
Member
Joined: Jun 2010
Posts: 160
Likes: 0
From: Eugene, Oregon
Year: 1999
Model: Cherokee
Engine: 4.0 L I6 (Ford 4.2L Injector Upgrade and Yellow Top Optima))
"For a three inch lift, I found about 8 degrees of shim was needed. This Jeep was fitted with two degree blocks so adding six degrees of angle to the spring pack brought it into alignment.
To calculate the shims needed, you will have to use trigonometry. However it is not too bad using this simple method.
With the transfer case and axle in place, I mounted the drive shaft. The misalignment was immediately evident. I placed a straight edge along the bottom of the pinion and parallel to the pinion shaft. I then measured the distance from the drive shaft center to the top of the straight edge. In my case, I measured to a point 30 inches up the shaft and found it need to be raised three inches to make it line up.
Now divide the distance it is off by the distance up the shaft. In my case it was 3 divided by 30 or 0.1.
To convert this number to the angle, you need to take the arctangent of the number. This is easily done on a scientific calculator or even easier to do using Google. In my case I typed arctan(3/30) in degrees into the Google search line. Google returns this result: arctan(3 / 30) = 5.71059314 degrees. Round it to the nearest degree and try that shim. In my case a six degree shim was really close and worked fine."
http://mikestrawbridge.com/blog/2010...jeep-cherokee/
Literally googled "lift kit rear axle shim angle"
To calculate the shims needed, you will have to use trigonometry. However it is not too bad using this simple method.
With the transfer case and axle in place, I mounted the drive shaft. The misalignment was immediately evident. I placed a straight edge along the bottom of the pinion and parallel to the pinion shaft. I then measured the distance from the drive shaft center to the top of the straight edge. In my case, I measured to a point 30 inches up the shaft and found it need to be raised three inches to make it line up.
Now divide the distance it is off by the distance up the shaft. In my case it was 3 divided by 30 or 0.1.
To convert this number to the angle, you need to take the arctangent of the number. This is easily done on a scientific calculator or even easier to do using Google. In my case I typed arctan(3/30) in degrees into the Google search line. Google returns this result: arctan(3 / 30) = 5.71059314 degrees. Round it to the nearest degree and try that shim. In my case a six degree shim was really close and worked fine."
http://mikestrawbridge.com/blog/2010...jeep-cherokee/
Literally googled "lift kit rear axle shim angle"
Thread Starter
Senior Member
Joined: Feb 2010
Posts: 681
Likes: 1
From: errrvre where
Year: 1996
Model: Cherokee
Engine: I6 4.0L HO, JBA headers, 99 intake, #703 injectors
"For a three inch lift, I found about 8 degrees of shim was needed. This Jeep was fitted with two degree blocks so adding six degrees of angle to the spring pack brought it into alignment.
To calculate the shims needed, you will have to use trigonometry. However it is not too bad using this simple method.
With the transfer case and axle in place, I mounted the drive shaft. The misalignment was immediately evident. I placed a straight edge along the bottom of the pinion and parallel to the pinion shaft. I then measured the distance from the drive shaft center to the top of the straight edge. In my case, I measured to a point 30 inches up the shaft and found it need to be raised three inches to make it line up.
Now divide the distance it is off by the distance up the shaft. In my case it was 3 divided by 30 or 0.1.
To convert this number to the angle, you need to take the arctangent of the number. This is easily done on a scientific calculator or even easier to do using Google. In my case I typed arctan(3/30) in degrees into the Google search line. Google returns this result: arctan(3 / 30) = 5.71059314 degrees. Round it to the nearest degree and try that shim. In my case a six degree shim was really close and worked fine."
http://mikestrawbridge.com/blog/2010...jeep-cherokee/
Literally googled "lift kit rear axle shim angle"
To calculate the shims needed, you will have to use trigonometry. However it is not too bad using this simple method.
With the transfer case and axle in place, I mounted the drive shaft. The misalignment was immediately evident. I placed a straight edge along the bottom of the pinion and parallel to the pinion shaft. I then measured the distance from the drive shaft center to the top of the straight edge. In my case, I measured to a point 30 inches up the shaft and found it need to be raised three inches to make it line up.
Now divide the distance it is off by the distance up the shaft. In my case it was 3 divided by 30 or 0.1.
To convert this number to the angle, you need to take the arctangent of the number. This is easily done on a scientific calculator or even easier to do using Google. In my case I typed arctan(3/30) in degrees into the Google search line. Google returns this result: arctan(3 / 30) = 5.71059314 degrees. Round it to the nearest degree and try that shim. In my case a six degree shim was really close and worked fine."
http://mikestrawbridge.com/blog/2010...jeep-cherokee/
Literally googled "lift kit rear axle shim angle"
thanks alot man.. that helps alot. i shall get the order out before it gets to cold to fix it.
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