79 k10 gearing

[Scottsdale1977]

I'm looking for some info/advise for my 79 k10. It's still set up as full time 4x4 with a 12 bolt rear and a gm 10 bolt front. My issue is this truck is geared way too high. It's a 2.76 axle ratio. I'm only running 31" tires but would like to upgrade to 33" in the future. I have a set of rears out of a 77 k20 with only 80k on them I bought plus they have all new leaf springs already on them too. There 4.10 ratio 14 bolt full floater in the rear and a Dana 44 8 lug I'm the front that's a 4.09 ratio. What's the easiest way to swap rears? Does anyone know if my driveshafts, and calipers will bolt right up? I imagine my speedometer will be way off too. Any advise is greatly appreciated.
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