Hey guys, I recently replaced the front diff on my 99 with a "stronger" 2001 unit with about 180k miles from a junk yard (non-accident vehicle). I replaced the front bushing before installing, but left the other two mounts with integrated bushings since they looked/felt intact when I reinstalled the new diff. While this upgrade took care of the grinding/whining sounds I was getting from the old diff, I am now experiencing a new issue.
When accelerating and the transmission is approaching a shift point, I am feeling a buzzing type vibration in the floor with my left foot. The vibration intensifies as the RPMs get higher, and subsides when it shifts into the next gear. It is most pronounced when shifting into 4th gear, around 55MPH. Once I get into a cruising speed and no longer pushing on the gas, the vibration is not really noticeable.
Any ideas what could be causing this before I pull the axles again and try to poke around? Is it an install-related issue, or a potential problem with the "new-to-me" diff?
When accelerating and the transmission is approaching a shift point, I am feeling a buzzing type vibration in the floor with my left foot. The vibration intensifies as the RPMs get higher, and subsides when it shifts into the next gear. It is most pronounced when shifting into 4th gear, around 55MPH. Once I get into a cruising speed and no longer pushing on the gas, the vibration is not really noticeable.
Any ideas what could be causing this before I pull the axles again and try to poke around? Is it an install-related issue, or a potential problem with the "new-to-me" diff?