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Re: whats the difference between 2wd and 4wd steering box
These are the NAPA power steering gears for 1972 trucks I found on their website. According to them the 2wd and 4wd PS gears are different. The only difference I can see in the specs below is the # of turns lock to lock. I have a 1980 PS box from a 2WD on my '72, and it is real responsive and improved the steering greatly over the manual box. I am using a '72 PS pump and had to make a special high pressure line with the metric O-ring fittings on the gear box end. I'm sure someone on the board can give you a better answer to your question about the turn radius...Good luck, Sam.
4WD
part no. NSP277502
# of Mounting Holes:4
# of Turns Lock to Lock:3 1/3 - 4 1/4
Input Shaft Diameter:13/16"
Line Thread Size:11/16x18; 5/8x18
Output Shaft Diameter:1.25"
Type of Hose Ports:Tube Seat
2WD
part no. NSP277501
# of Mounting Holes:4
# of Turns Lock to Lock:3 1/3 - 4 1/8
Input Shaft Diameter:13/16"
Line Thread Size:11/16x18; 5/8x18
Output Shaft Diameter:1.25"
Type of Hose Ports:Tube Seat
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'72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.   
Last edited by Sweet72; 08-14-2006 at 07:14 AM.
Reason: Additional info
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