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Old 03-17-2017, 07:53 AM   #19
special-K
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Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,863
Re: Granny geared 71' K10, I need to go faster...

How fast do you want to go? With those 10-bolts you will have much taller gears than I thought at first. The lowest gearing you could have are 3.73s. I imagine the whole reason for the axle swap being done was to get taller gears. I had a '90 Blazer 4spd with 3.08s and that think flew down the hiway. I ran 33/12.50s on that. I was glad to have the granny first because the gears were so tall. In my trucks with 4.10s I almost never use 1st. Gotta figure 3.08s spin right about one revolution less than 4.10s to go the same speed. About the same gain as adding O/D. If I owned that truck and wanted higher hiway speeds I would put a 700r4 in, but not if it has 3.08s unless I planned to go with lower gearing to gain grunt
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