01 SIlverado Front Differential Noise in 2WD
History: I have a 2001 Silverado 1500 4x4 with 135k miles. i took the front drive shaft out a while ago because i need to replace the u joints. well, i finally got around to putting it back in (20k miles later).
Problem: once the drive shaft was placed back in ,with the new u-joints, i noticed a noise coming from the front diff. It sounds like a light metallic chaffing noise like there is marble or something Floating around inside the front Drive shaft (i know thats not the case)
-the noise occurs in 2wd from 20mph and gets more prominent the faster i go.
-the noise goes away while in 4wd
-the noise is gone when the front d-shaft is out.
-the noise is gone in 4wd and gone once put back into 2wd while holding a constant speed. but once i decelerate and accelerate it makes the noise again.
any Ideas???? I dont think its CV's or the left or right output shaft bearing on the front diff. I think it may be a spider gear or or clutch plates inside the front Difff.