If I remember correctly, it was just the bottom shock plate and the holes in the axle where the center pin goes through. I don't think I had to do anything else. I did TRE's and RBE's at the same time.
I was told if you buy the Man a Fre U-bolt flip kit they have predrilled extra holes in the bottom plate to move the axle forward already.
I was told if you buy the Man a Fre U-bolt flip kit they have predrilled extra holes in the bottom plate to move the axle forward already.