for our 4x4 trucks?

I think i have a bad u joint but it only sqeaks when in 4 wheel drive, not in 2 wheel

 

I think you'll find that the front shafts turn all of the time, as there aren't free-wheeling hubs fitted. The reason you may be getting the noise only when in 4wd, is that whilst they turn in 2wd, they're under virtualy no load.

Hope this helps,

Paul

 

yes it does thanks