I have a 2000 Zr2, 3 button 4wd switch (4 hi, lo and 2 hi)...The light on the switch when I push 4hi, lo or 2hi does what it supposed to, and I can hear a clank from the transfer case as if it went into gear but only the rear tires are spinning in the snow....I had a friend use my truck to move (atleast it wasnt me right) and got it back, was in 4hi, it was dry out...he drove atleast 20-30 miles and was smoking, couldnt tell where it was coming from seemed like the engine bay but it was bad and I was pissd...Im sure this has something to do with it...I don't really understand how the 4wd works in this truck...I have a diagnostic sheet the dealer sent me on what the voltages should be reading that the case but I don't think its the swich....??
Also, my rear diff doesn't lock, a mechaninc friend said to add friction modifier to it, I had flushed it, but it never seemed to work anyways for me before...do you think the friction moddifier will do the trick??
Thanks for the help!