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Yep, the manuals, had TCS too. Component locations will be different in a I6 as compared to a small V8. The trans switch is different between man. and auto transmissions, being mechanically actuated in the manual and pressure actuated in the auto. The system uses the same components otherwise. If you're really interested in restoring this system, you should obtain a copy of the 1972 10-30 series truck service manual. It explains system operation, components and has complete wiring diagrams. Good luck on your resto.
-Sam
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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.   
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