The latest year is 1981. The arm is called "pitman arm", and the later arm will work. One reason to use a "later" gearbox, you will gain a quicker variable ratio gearing. It will be a little quicker in its' turning, making your truck a little more fun to drive. Ain't Chevies nice? This swap isn't even feasible on those lesser makes. hehe
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1970 long fleet, 355 4 speed, primer, walnut goodies
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