We had two WD-45's..one Dad bought new in '57 and mine I bought from my Grandad. Dad;s came new with the Semi-mounted 4x14 and mine had the fully mounted 3x14.. Plowing with them should be done in 2nd gear, but mine (with the 3x14" could pull it in 3rd..but that was entirely too fast..and..checking fuel consumption, either way I used more gas per Acre than Dad, using the 4x14".. I eventually found a 4x14" for mine and we had a great matched pair.. For Discing, we put Duals (14.9x28")on one WD-45 and matched it to the IH #37 Disc/Harrow and wheel slippage was never a problem after that.. Always, first time over, we used the JD "B" and 8' Soul Surgeon (Drag) to settle and firm up the soil..didn't bring up nearly as much residue that way.. AC plows can turn Sod in mile long ribbons and that makes working the ground a real Pleasure, the 1st time over..!!!!