Compression Ignition Addict
Join Date: Dec 2007
Thanked 262 Times in 253 Posts
Mentioned: 7 Post(s)
Quoted: 109 Post(s)
Feedback Score: 3 reviews
Here's what happens, when the hubs are UNLOCKED the wheel is spinning and the axle is Not. That axle (short stub axle from the U-Joint into the hub) is stationary and has to be supported by the needles as it's not spinning with the rest of the assembly. Bad needles (and they fail ALL the Time) cause noise.
BUT when the hubs are LOCKED, everything spins together and those needles aren't needed. At that point they are stationary and cause no noise.
Double check, be sure this is involving the TC position..... You're going from an easy fix, to something more complicated because, the entire Ft end, U-Joints/axles/diff, are spinning with those hubs locked.