Church,
I bet the top of the differential is right below the bed floor when it's lowered. Mine is a little lower than that truck in the back so I raised my bed floor an inch and a half instead of cutting a hole in the bed.
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Formerly know as: "GMC Under Construction"
Current project: 1967 GMC shortbed/fleetside, 350/700R4, air bag suspension.
Other vehicle of interest: 1957 Chevy Bel-Air 4dr hard top, 283/powerglide, lowered 3-1/2" in front and 2 inches in the rear.
Web Site: jaySpot.com AOL Screen Name: Slammed67GMC Location: Kansas City, MO