Mark, I bought carpet for a 1985 standard cab 4X4 w/Auto and a standard cab 4X2 w/auto, and connected them under the front seat with a piece of trim from a ramcharger. Every Crew Cab that I have seen has a 4X4 center hump in front and a 4X2 in back (My truck WAS a 4X2). Now this should work in theory, but I will have to wait until the weather warms up so I can clean up the rust damage from the OEM rubber floor mat. I already have the carpet(carpet from JCW) and trim, I also order extra insulation for the floor, to cut down on the "Getrag" gear noise. If you would like, I can e-mail you the part #s.
Kyle
------------------
1985 DODGE 1 ton Crew Cab(imported from California with no rust) W/8' box converted to 4X4 in 1999. Converted to a non-intercooled 1991 Cummins Turbo diesel & rebuilt 5 speed Getrag in 2001(wife can't drive a stick

. Freshly rebuilt and Balanced Cummins, Rebuilt NP205, Rebuilt Injector pump and tweaked, Matched Injectors, 3" New Mandrel Bent Exhaust,no muffler, Borgeson Steering Shaft, K&N Air Filter, 4:10 gears, limited slip rear end, 16" Goodyear GSA Wranglers, 16K Reese 5th Wheel Hitch,and LE Package and a Sony CD Stereo. Next add-on some “Banks” toys ! If you want to know why I did all of this, 2 kids, one on the way and I can't stand F**d and Ch**y. Kyle Hoover ,Fruitport, MI.