Can you take a pic of the fender badges? Never seen a set like those.
Regarding the tranny differences, there were two 3 speed manuals used between 67-72 (not counting the overdrive version). The first style used in 67/68 is a non-synchro'd tranny. The second is a synchro'd 3 speed used 69 and up.
They can be identified by the number of bolts on the shift fork cover. the 67/68 version has 4 bolts, the 69-up has 7. The 69-up is a longer tranny too, consequently the driveshafts in 67/68 trucks with this tranny are longer than in the 69-up counterparts.
The one on your red truck looks correct for the year. Your other truck may have had a later version swapped in? 
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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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