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07-04-2012, 04:21 AM
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#1 |
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Registered User
Join Date: Nov 2008
Location: Rowlett, TX
Posts: 861
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Degree Shim Help
On my 71 Suburban, I am installing about an 3-4 lift kit, and wanted to know if I need degree shims in the rear, The original owner had shims on it with about a 4 inch kit, but I took it out with the suspension. If I need them, which way are they supposed to go on the axle....fat end to the rear, or fat end to the front???? Thanks in advance!
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07-04-2012, 09:52 AM
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#2 |
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Registered User
Join Date: Jul 2006
Location: Central PA
Posts: 12,201
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Re: Degree Shim Help
It would be fat end toward the rear so the driveshaft angles towards the transfer case, less bind on the u-joints.
Sometimes the rear blocks are already angled though, you want as little angle from the driveshaft ujoint to the rear pumpkin as possible... It doesn't have to be perfect though...
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The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer" |
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07-06-2012, 09:44 AM
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#3 |
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Registered User
Join Date: Apr 2000
Location: Chester County PA, USA
Posts: 1,228
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Re: Degree Shim Help
If you have a single cardan style driveshaft (1 ujoint at both ends) than the angle of the transfer case yoke and the angle of the rear yoke need to be the same at cruising throttle.
If you have a double cardan style drivesaft (2 u joints at one end and a single at the other) than the axle pinion is in line with the driveshaft at cruise throttle. With everything bolted up, put a angle finder on the yokes and see what ya got.
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72 k/10 short wideside 72 k/5 Blazer 72 K/5 Blazer - obstacle course racer 72 custom/10 8' bed 70 K/5 Blazer 67 C-30 GMC Flat bed 86 GMC K2500 Plow Truck 85 GMC K3500 84 M1008 85 M1008 77 G30 Motor Home 72 Sears 12hp Tractor Glenmoore, Pennsylvania |
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