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Old March 10th, 2006, 11:24 AM
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Kip Hartzell
'95 4.2L NAS D90
Join Date: Jan 2005
Location: Raleigh, N.C.
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Question Rear driveshaft geometry - changes?

Question/opinions? Is is better to use a rear Double Cardan drive-shaft and tilt the differential flange towards the T-case, or is it better to keep using a standard single u-joint drive-shaft? Currently my D90 has a ~2" lift. The T-case and diff flanges are on the same plane for the most part. The rear diff flange points upwards by 1-2 degress and the t-case flange points down by about 2 degrees (anyone know it this is the way it should be?). This appears to be a good setup for a standard single u-joint drive-shaft.

I already have a TW DC drive-shaft that I would like to install; However, it is recommended that the rear diff be pitched towards the t-case flange to eliminate torsional vibrations. I already have Rovertrack HD trailing links install and I don't want to change them, can the diff be effectively pitched thorugh the a-arm setup. Advantages/Disadvantages?

Or should I ditch the DC and look to get a heavy duty single drive-shaft for the rear?

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Old March 11th, 2006, 02:45 PM
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Bradlee Duncan
'94 White and '95 Red D's
Join Date: Sep 2004
Location: SLC, Utah, USA
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If those rovertracks trailing links are adjustable, it would be fairly easy to pitch the pinion up (I don't think you'd need to worry about the a-arm extension, but you'd have to try to be sure). If they're not adjustable, it might be more trouble than it's worth with just a 2" lift. In that case, I would suggest just making sure the pinion and t-case flanges are perfectly aligned and your u-joints might wear out a little quicker because they'll be working at harsher angles. If you wanted, you could have a custom, higher-angle DS made, but that would be about as pricey as getting new trailing links.
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