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OK, so i just got my 5.3l and 4l60e for my 72. I believe that the stock R&P thats in the axle now was for the 6cyl. I dont know what size R&P i need to get so optimum cruzing and a little play time on the side roads.
Im planning on running a 50/17 or a 55/17 tire. Any ideas? Should i try to match the gears that were in the silverado before i pulled the engine? Will that R&P from the silverado fit in the nova 10 bolt? Thanks.
 

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I would say 3.42-3.73 range would be good. The truck would have come with either of those from the factory as well. Your tires will be shorter than the truck tires most likely and will give you that little extra umpf.

Miles
 

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I went with 3.55 gears in my Wagon and I have 275-60-15 rear tires (27.5" tall)
 
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