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I have heard that it will be very noticeable at low speed, easy to check, just make sure the u-joint bearing caps are lined up end to end:

http://www.4crawler.com/4x4/CheapTricks/Driveline-101.shtml#Phasing



Very or bearly noticeable? <img src="/forums/images/graemlins/notooth.gif" alt="" />

93 4X4 ext-cab, auto, SR5, 3.4 V6, supercharged, 2.1" pulley, URD fuel mods, Aquamist WI, IPT valve body mod, dual cases, 4" superlift, Alcan springs, 33 BFG MT, ARB locked front & rear, 5.29 US Gears, RB 1" BL, 1.5" BJ spacers, TJM T-17, Warn m8000.