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41CHEVY

MACK Plus 3 Conversions

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Because I can't seem to do one or two projects at a time and the M917 /915 projects are in the fiddly stages I started this.

In 1973 MACK went from the flat back cabs like the AMT DM 6 and 800's have to the Plus 3 cabs (they were 3 inches longer for the driver comfort). I'm making the R685 into a 1969 Steel Dash flat back cab and the DM600 into a 1975 U-600. The biggerst asset to this conversion is a .005 thick Gyro saw for the Dremmel.

First step is to cut the fronts of both cabs off at the front door line and at the base of the windshield.swap and reglue the fronts on the opposite cabs. The DM interior needs a 1/8 inch shim on the rear to fit the plus 3 cab and the R interior needs a 1/8 inch to zero pie cut out of the reas sides to shorten it to fit the flat back cab.

DSCF2517-vi.jpgHosted on Fotki

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The interiors now need modifications to update the DM and back date the R.  The DM needs to had a 3/16 piece of .020 plastic glued on the right side to hold the passenger side of the R dash. The DM interior is 1/8 inch wider. The shifter holes need to be filled to use the R 5 speed shifter. The R dash needs the filler cut off where it fits under the windshield originally. The R clutch pedal needs to have the pedal arm cut off and glued back on 180 degrees around. The  part than glues to the dash instead of the DM firewall The seats from the R are used but you need the DM seat mount frames. The R steering wheel is also needed for the smaller diameter and the late horn button.

R8-vi.jpgHosted on Fotki

The R interior needs the dash mount slots cut 1/8 inch deeper to lower the steel dash down a bit. Seat mounts are the R mounts with the DM seats used. The DM steering wheel is used for it's larger diameter and early horn button. Use the stock DM clutch pedal and the DM shifters. The  reason for the shifter changes is the R ends up with the DM 5/4 Quadbox and the DM/U ends up with the 5 speed from the R.

R9-vi.jpgHosted on Fotki

 

 

 

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