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The driveshaft is going to be the biggest issue for you and you'll need the donor's driveshaft and carrier bearing. Here's why:
The 4 speed does not use a slip yolk as the 3 speed and auto's do, it uses a u-joint connection similar to the rear diff. The "slip" is in the driveshaft where the front and rear pieces join.
The 3/4 ton uses a different rear differential, therefore the length of the rear shaft won't be correct to meet up with the 1/2 ton rear diff, plus the u-joint size is different. The u-joint ssue can be resolved using "hybrid" u-joints available thru NAPA, etc.
So, you'll have to use the 3/4 ton's driveshaft and carrier bearing, hybrid u-joints at the rear diff, and either lengthen or shorten the rear part of the driveshaft (not sure which).
Another alternative is to find a driveshaft off a 4 speed 1/2 ton truck, but these are not easy to locate.
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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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