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How-to Video: Measuring Dodge Ram Speedometer and Odometer Error!

This how-to provides two simple methods for checking the speedometer and odometer accuracy.
(If bandwidth permits, view this video in 'full-screen' mode and HD 1080P quality!)

Dodge Ram truck with oversize tires and wheels

     The magazine's Ram 3500 "makeover" and 4.56:1 ring-and-pinion gear change now make the Dodge Ram a better trailer puller. For tire clearance, we raised the truck, using a 4-inch Mopar suspension lift. Oversized BFG tires and aftermarket 18" wheels round out the package. In the process, the 35" diameter tires and 4.56:1 axle gearing altered the speedometer calibration. Now we need to calibrate the speedometer!

Correcting speedometer error with DRBIII scan tool

The DRBIII scan tool enables speedometer calibration on 1998-2006 Chrysler vehicles. For models with a tone ring ABS sensor, the calibration involves changing the tire revolutions per mile in the PCM. Before using this scan tool, you need to know the percentage of speedometer error! (See the HD video for details.)

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Click here for access to the Bentley Publishers website and Jeep Owner's Bible, 3rd Edition, by Moses Ludel.

Jeep® Owner's Bible  by Moses Ludel—available for more than two decades and a best seller!

 Click here for access to the Bentley Publishers website and information about the 1946-71 CJ Jeep Rebuilder's Manual by Moses Ludel.

Each of Moses Ludel's Jeep® books earned an official Mopar® part number!

 Click here for access to the Bentley Publishers website and information about the 1972-86 CJ Jeep Rebuilder's Manual by Moses Ludel.

For 4x4 Jeep®, Truck and SUV technical information, make this magazine your professional resource!

 Ford F-Series Pickup Owner's Bible by Moses Ludel (Bentley Publishers)

Moses Ludel's Ford F-truck and GM truck books earned official Ford Motor Company 'SVO' and GM Motorsport part numbers!

 Chevrolet & GMC Light Truck Owner's Bible by Moses Ludel (Bentley Publishers)

 Toyota Truck & Land Cruiser Owner's Bible by Moses Ludel (Bentley Publishers)

The Toyota Truck and Land Cruiser book by Moses Ludel is a classic among vintage Toyota pickup and FJ40 Land Cruiser owners!

Find Moses Ludel's books at: Bentley Publishers, Amazon.com, Barnes & Noble, Advance Adapters, 4WD Hardware, Quadratec, Willys Jeep® Parts, 4x4Books—plus independent book stores and many 4WD outlets!

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