I don't know what the angle is supposed to be but if it started after the lift was installed you may have to take the drive shaft to a driveline shop and have double cardan joints put in. That helps get rid of driveline vibrations.
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1970 Chev C20, 2wd, LB, 350 4BBL, muncie 4spd, 4:10 limited slip.
2002 Chev 2500HD 8.1L Allison, 4X4.
1996 Chev S10 Blazer, 4X4.
2006 Jeep LJ Rubicon
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