Nikolai:
Glad the shock worked out. I was pretty baffled by your ratcheting problem, as I am running the 153 absolutely slack. So slack I can feel the track wrap running over the antistabs in rotten corn snow at slow speeds. The only thing that is really different between the 2 skids is the front shock as the setback shouldn't make much difference.
Beeze, that 9.5 dimension is key, and thanks for that also would you mind taking a couple of more dimensions off your M skid? If you can I will try to post all the dimensions on an Autocad drawing for the M, MTX, and the AC skid in the MTX/XTX.
If you measured from the centerline of the drive shaft back to the center line of upper hole in the rear drop bracket, and then where the front hole is in relation to that line. Ultimately, those are the most important dimensions for the suspension to function. After that, its a matter of fitting that set of dimensions to the tunnel. The dimensions I am looking from are on the picture below. You will notice that my dimensions are different but that's because of the MTX having a 7 tooth driver and the M has an 8 tooth (both 3 inch pitch). If you look on the drawing, the bigger drive circle represents the 8 tooth driver. If you used the bigger circle, its pretty easy to see you could move the whole skid forward quite a bit.
What's key to remember is that your driver diameter effects the location of the skid in your tunnel. You can't use the M tunnel dimensions directly on an MTX or XTX. The dimensions for the AC skid in the XTX will be unique, and different from the AC skid in the MTX. Most of my work is on the AC M and MTX but I will use my 10 xtx and figure out how the XF 141 fits into it as well. It will take me a while to get all this onto a drawing, but I am part way there and I'll post them when I am done.
OTM