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Cab To Running Board Spacing

Chip

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Jul 15, 2021
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I've salvaged alot of body parts for my project. Fixing rust along the way.
I have a 3100 frame which is very solid with a 6400 cab. The rear shackles from the cab were in great shape also but have a different bolt pattern than the frame has. The front is bolted down with the rubber frame mount, but I've researched and can't find the obvious answer.
So is the reveal from the cab to the running board is suppose to be fairly parallel?
Right now the rear cutout on the back of the cab to the frame is equally spaced about 1.5" on the sides and top but that puts the cab at the rear to the running board about .6" higher than front.
What is the norm?
Thanks. Chip.
 
Got the info on placement from another AD truck site. Tis done.
 
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