Speedometer Gear Correction Re-revisited

[Harry5150]

Well I finally got around to changing the speedometer gear on truck.

I had the stock speedo gear with ProComp 33/12.5x15 Xterrains and had the truck calibrated by AAA. You can see the 2-9 mph variance as well as the actual miles being off by 15% which of course throws off your gas mileage.

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I replaced the stock 19 tooth tan gear below...

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with the a 17 tooth green gear.

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Here's the results. Not perfect but much better.

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Details

1997 Explorer Sport
2WD w/ 5 Speed Auto Transmission
33/12.5x15" ProComp Terrains
19 tooth Tan Speedometer Gear (before)/ 17 tooth Green Speedometer Gear (after)

 

[Crankcase]

That was pretty cool to see the varience between March and August. How much does it cost to get those tests?

 

[Harry5150]

Free of charge to AAA members.

 

[ok89]

I'm an AAA member and ive never heard of this where do i go or who do i call?

 

[Harry5150]

Go to AAA.com, register as a member and then go to member services. I believe it's in the auto maintenance section & it gives drive up locations.