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im still running full time in my 74 GMC. I figure if it aint broke, don't fix it. Its proven itself over many years of use, with no issues.
i have a 203 in my 76 k20 , 350 automatic, i will convert to part time soon, 410 gears , 58 mph max 9-10 mpg, 1996 gm 454 tbi 50k miles to add soon. wish they still made the shaft conversion> now only spider gear. conversions