I'm rebuilding my sm420 and I WAS going to add a gear vendors overdrive. However, the crossmember that lies between the frame rails that is also part of the torsion bar suspension is right where the pan of the O.D. will be once I install it. I frequently run into these type of issues because a few of these vendors somehow think that parts that fit a 63 -66 will fit a 60-62. WRONG. The 60 -62 frame and suspension are not the same. Does anyone have experience with this torsion bar set-up and/or have you modified or maybe fabricated a crossmember that might allow clearance for such an item? What about changing the suspension on this particular frame. For those of you that might know the difference, it is the "X" style drop frame as opposed to the "ladder" frame used on 1/2 tons from 63 thru 87. Do I have other options or am I up the creek? Thanks for the help.
