rear lift ?
Dec 20, 2008 | 06:52 AM
#1
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From: Show Low, AZ
rear lift ?
we are putting a 4" trail gear rear lift on a 94 pickup. my question is when pointing the diff pinion angle at the output of the transfer case do you set the angle pointing towards the transfer case or where the driveshaft kinks at the carrier bearing?
OR
should we point the diff at the t-case and lower/space the carrier bearing down so that the whole driveline is in a straight line? thx
OR
should we point the diff at the t-case and lower/space the carrier bearing down so that the whole driveline is in a straight line? thx
Dec 20, 2008 | 07:17 AM
#2
Depends on what type of drive shaft you have on the truck:
- http://www.4crawler.com/4x4/ForSale/Shims.shtml#FAQ1
- http://www.4crawler.com/4x4/ForSale/Shims.shtml#FAQ1
Dec 20, 2008 | 03:52 PM
#3
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Joined: Apr 2006
Posts: 1,043
Likes: 1
From: Show Low, AZ
it is the one with the carrier bearing in the middle (so there are 2 driveshafts that are connected just past the carrier bearing) factory what came on the 94 x cab sr5. i have cut off the factory perches on the rear axle and tacked the supplied perches inplace and put the axle under the truck with the ubolts just hand tight like the instructions say but dont know which ujoint (t-case output u-joint or the carrier beaing u-joint). i wold call them but they are closed on weekends.
Dec 20, 2008 | 03:56 PM
#4
Read the information on the web page I posted a link to earlier (or below):
- http://www.4crawler.com/4x4/ForSale/Shims.shtml#FAQ1
If you can't access the page, this is what it says:
- http://www.4crawler.com/4x4/ForSale/Shims.shtml#FAQ1
If you can't access the page, this is what it says:
2-piece driveshafts (i.e. center support bearing):
For applications with 2-piece driveshafts (i.e ones with a Center Support Bearing - CSB), there is often confusion about what to do about the CSB. Some folks think it is necessary to shim the CSB to correct the driveshaft angle. This is generally not something you want to do. Why? Look at the way the driveshaft is set up. The part from the transmission/transfer case output to the CSB is generally a signle-cardan shaft, It has one or maybe two u-joints on it and generally is run straight at both ends. And since it is a single cardan shaft, the angles at both ends must stay equal for smooth operation. So, if you shim or lower the CSB, you are changing the angle of that shaft and that can lead to alignment issues and vibration. The proper place to shim is at the axle. Only look at the bottom half of the shaft, it is either a single-cardan (u-joint) or double-cardan (CV joint) shaft and you just measure and correct the angles on that part of the shaft. So just treat the bottom half of the 2-piece shaft like any other driveshaft and forget the upper half.
For applications with 2-piece driveshafts (i.e ones with a Center Support Bearing - CSB), there is often confusion about what to do about the CSB. Some folks think it is necessary to shim the CSB to correct the driveshaft angle. This is generally not something you want to do. Why? Look at the way the driveshaft is set up. The part from the transmission/transfer case output to the CSB is generally a signle-cardan shaft, It has one or maybe two u-joints on it and generally is run straight at both ends. And since it is a single cardan shaft, the angles at both ends must stay equal for smooth operation. So, if you shim or lower the CSB, you are changing the angle of that shaft and that can lead to alignment issues and vibration. The proper place to shim is at the axle. Only look at the bottom half of the shaft, it is either a single-cardan (u-joint) or double-cardan (CV joint) shaft and you just measure and correct the angles on that part of the shaft. So just treat the bottom half of the 2-piece shaft like any other driveshaft and forget the upper half.
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