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as far as gear ration goes, id try to go for 4.10's, there a great all around ratio, you should take a few min. and look up a gear ratio chart, it will answer a lot of your questions. and for the wheel size, when it comes to chevy axles, a 15" rim will fit on all 1/2, 3/4, and 1 ton axles...

your right about the rear, they are all 2.5" wide but come in a variety of lengths, 52", 56", etc. a lot of people put the 52" springs up front and get excellent suspension travel.

ALL 1973 to 1987 chevy springs are the same! width(2.5") and length(46"), i have never heard of moving spring perches, i just swapped a dana 60 into a friends 74 blazer and it was a direct bolt it, the axle came from a 1986 crew cab 1 ton. the only difference between a d60 and a 10 bolt/ 12...

i agree that the semi float will work, but what do you mean swapping 1tons is more work??? i can think of u-joint and u-bolts, and you may require new of both no matter what axles you swap in, some axles have different yoke sizes.

find a chevy one ton and swap out for the 14ff and the d60, or better yet find a beat to **** 1008 or 1028 and rob ones with the 4.56's and a detroit. with the 6.2 and cucv 1tons you will never break anything as long as you do maintenance, i.e. u joints, kingpin spring and bushing if there is...