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no clue on the door locks, but the kickdown should occur at WOT (wide open throttle) if you have a th350 trans. as for the sound deadener, im sure someone will shoot this idea down claiming that it'll trap moisture, but i'd just use the rubberized undercoating. applied to a clean dry surface and don't block the door drain holes.
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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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