speedo gearing

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coreys87

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Sep 13, 2011
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Location
newyork
First Name
corey
Truck Year
1987
Truck Model
v1500
Engine Size
305
truck originally had 308s. now its gonna have 383's with 35inch tall tires. how do i figure out how to gear the speedo so its accurate?
 

jt1200r

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Huntingtown,MD
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Jeff
Truck Year
87
Truck Model
r10
Engine Size
4.3/th400/3.08
run with a GPS i went from 273s to 308s im over about 8 mph at 65-70
 

crazy4offroad

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Location
West BY-GOD Virginia
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Curt
Truck Year
1979
Truck Model
K-10
Engine Size
350/SM465/NP205
I've never heard of 383 gears, you more than likely have 3.73s.
 

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