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I'm getting 13 mpg average. The question I have is, how does gears and bigger tires affect the speedometer and odometer. I have 33" tires with 3:92 gears. Doing the equations my effective gear ratio is 3:56 which is factory specs + or - so in theory my speedometer and odometer should be correct as it shows. Am I true in this statement.
in older models with speedo gear in transmission - gear change affects speedo. (along with tire size).
in later models with speed sensor in rear diff that reads the tone ring, the gear change has no effect, and only the tires affect the speedo.
to know for sure, do a speedo test along the highway. hold 60 mph exactly and measure time between the mile markers. 60 mph will travel 1 mile in exactly 60 seconds.
in older models with speedo gear in transmission - gear change affects speedo. (along with tire size).
in later models with speed sensor in rear diff that reads the tone ring, the gear change has no effect, and only the tires affect the speedo.
to know for sure, do a speedo test along the highway. hold 60 mph exactly and measure time between the mile markers. 60 mph will travel 1 mile in exactly 60 seconds.
Thanks, I know I have the speed sensor in the rear diff, I remember putting it on the new carrier during gear and carrier swap. I will have to do the highway test then. Does it also affect odometer accuracy. Guess I could do highway test for that too.