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Re: Posi rear differential factory option?
Look for a posi in a hiway-friendly ratio. Posi was available in an ratio. Personally, I would look for a more recent 12-bolt factory posi in 3.42:1, since ratios jumper from 3.73 to 3.08 in these trucks. 3.73 may be too grunty and 3.08 may not have enough grunt. 3.42 is the perfect sweet spot for running w/o overdrive yet works well if you do go with overdrive in the future. Probably your best bet would be buy an aftermarket performance posi, like Auburn gear
GM also offered posi for the front of the K-models, although seldom seen
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed"
GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project)
GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling)
Tim
"Don't call me a redneck. I'm a rough cut country gentleman"
R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~
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