Attn: Frame swappers
 

I took some measurements today on my '66 C10 and '83 C30 frame. Here's what I found out about the front/rear cab mounts...

66 c10
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frame rise between: 0"
front mount: 2.25" below top of frame
rear mount: 1" above top of frame

83 c30
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frame rise between: 4.25"
front mount: 2.75" below top of frame
rear mount: 0" (flush with top of frame)