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It's going to be off. Even if you do gears to compensate, it's likely to be off if you have a 98 or newer. They use the tone-ring on the ring-gear for speed/mileage calculations.
 

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Tell me more about this heads up display, factory or aftermarket??
 

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Just get an aftermarket speed calibrator, like from superlift and you will be back on track!
 

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Discussion Starter · #5 ·
yeah its stock heads up display...uncle mark speed calibrator?? tell me more about this......i hate having speedo and heads up not working right....would like both to be right..but is this possible????
 

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There's an option to get a "trip" computer that's up above the rear-view, where the map-lights are. Factory option. Has another odometer, a engine-running clock, real-time mileage, average mileage over last 30 gallons of fuel, miles until the tank is empty, a compass/temperature display, or can be blank.

Wonderfull thing, but since it uses the same speed information as everything else, it gets off as you change from the stock tires. If you are running a stock tire size, the dealer can flash in your current size, and they used to be allowed to flash in any size you wanted, but the EPA decided that the dealers can only flash in "factory" settings, not non-factory settings, so the number of revolutions per mile got pulled into that rule... f***ing EPA...

Anyways, if you have a 98 or newer, Superlift makes a little box that listens to the speed signal from the tone-ring in your rear axle and outputs another signal that is faster or slower, depending on what correction you need. You just use some switches or dials on teh box to tell it what correction to enter, and they have a table to help you do it right. If you have 4-wheel ABS, you may need 3 units, one for the rear axle, and one for each front wheel.

If you have a 97 or earlier, you can just get a different size speedo gear put into your t-case's tail-shaft housing.
 

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hell with the price of superlifts , im considering trying KRC performance. they have theirs for $150, instead of the $193 4 wheel parts wants.
 
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