Next up, you want to get all your measurements from your late-model frame. Most important thing is to find your front axle centeline. I took all my measurements from the axle centerline, ie motor mounts, tranny, etc. Once you get your axle center you can start planning where your going to make your cut on the frames. To make it easier I made my cut under the cab, this way my rear cab mounts are in the stock location and no modifications need to be made. I did however have to modify my front cab mounts. The 92 style frame made it easy to figure as the frame rails are the exact same dimension as our sweptline frames under the cab, so Z cutting the frame makes it real easy to line everything up. Also these frames use bolt motor mounts from Ma Mopar for big blocks, which is another plus.
Here you can see how I got all my measurements similar to how I did the 70 frame.

After you get all your measurements, you can move on to figuring where your going to make your cut. Once you layout where you want the center of the cut to be on both frames you can lay out your Z cut.
Your Z cut should be evenly spaced from your centerof you cut. So, if your going to make a 12" Z cut you want 6" from center to make your cuts. Note when you layout your Z cut reverse the cut on the other frame rail.
Typical layout of Z cut.


You can make this cut as long as you want, the longer the better.


Note: I left the transfer crossmember in the 70 frame to help keep everything straight.

Mark D.

1968 W200 Sweptline
1969 D100 Utiline
1971 D100 SE Sweptline
1993 D250 Club Cab Sweptline
1986 W250 Cab & Chassis
1978 D300 Sweptline

E. Brookfield, Massachusetts