I'd go with coils if its seeing only light duty. Interesting the Chevy has leafs and the GMC coils as coils were chevy's standard equipment and leafs were GMC's. Both your trucks have "optional equipment" rear suspensions.
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Jeff Jesseman
Cheyenne Parts Northeast
Franconia, NH
67 Chevy SWB Fleetside
70 GMC Burb 1/2 ton 2wd
72 Chevy Burb 3/4 ton 4x4
Parts bought and sold
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Currently on or near the homestead:
67 Chevy SWB 2WD stepside 350/3 on tree (Pat's)
67 GMC SWB 2WD Fleet 402/auto (Brian's under construction)
67 Chevy 3/4 ton 2WD 402/auto (Business Hauler)
67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC)
68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC)
70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC)
71 Chevy SWB stepside (Crushed by tree - parts donor)
72 Chevy 3/4 ton 4WD (Parts donor)
72 Chevy 3/4 ton 4WD Suburban (Parts Donor)
72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC)
81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler)
82 Camaro Z/28 355/Super T-10 (Pat's toy)
93 Caprice 9C1 (Brian's Cop Car)
02 Toyota Camry (Reliable but a souless steel and plastic hulk)
2011 2SS RS Camaro M6 Factory Hurst Shifter 
Maybe I need to sell some of this crap 
Yet another Bozo with a sawz-all
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