hi all
i have 31" on my '90 sierra w/t, 1.3 diff's and 1.3 tranny,
what percentage of reduction in high range do i need to fix my speedo and get my gearing back to stock'ish region???
i can find info on what % difference (eg. 4.9:1 = 115% in low and 16% in high and/or 8:1 = 250% low and 24% high) but nothing to say "running 31" with stock 1.3ltr w/t running gear (eg. diff & tran) you need ???% reduction"
any idea???
the reason why is when i had 29" wheels i kinda (needed a tad lower) liked the gearing level and want to know what % i need to achieve this
thanx guys n gals
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i've searched but i cant find it ? 1.3 sierra gearing???
31's are basically 19% taller than 26" stock tyres.
Bear in mind that 31's present more rolling resistance and aerodynamic drag, and are heavier, and you need more than 19% more reduction to get the same actual performance.
That's on paper. Real world- pretty much any transfer gear set will feel OK with 31's on it from a gearing standpoint on road. How much low range you need will depend on the type of terrain you are driving and your driving style.
Bear in mind that 31's present more rolling resistance and aerodynamic drag, and are heavier, and you need more than 19% more reduction to get the same actual performance.
That's on paper. Real world- pretty much any transfer gear set will feel OK with 31's on it from a gearing standpoint on road. How much low range you need will depend on the type of terrain you are driving and your driving style.
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