'01 Ram Speedo
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Joined: Jun 2006
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'01 Ram Speedo
I've just bought a 2001 Dodge Ram 1500 4x4. It has 286/75/16s on stock wheels. Needless to say, my speedo isn't too acurate. My local dealer doesn't know if it can be calibrated or not. It's a 5 speed, 4wd, 3:92 geared truck (should it matter).
Any ideas?
Thanks [sm=icon_cheers.gif]
Any ideas?
Thanks [sm=icon_cheers.gif]
Record Breaker
Joined: May 2005
Posts: 2,415
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From: Wisconsin
RE: '01 Ram Speedo
Taken from http://dodgeram.org/tech/specs/wheel/specs.htm
Subject: Changing tire size
Date: Fri, 13 Mar 98 20:53:20 CST
From: "Fest3er" <murphyn@mc.net>
To: cummins
Stopped at my Friendly Dodge Dealer this morning on the way to work and inquired about the procedure for programming the CAB. He looked in the service manual, looked in a couple others and finally dragged out the Chassis Diagnostic Manual. There, in section 29A, it explains the procedure needed to program the CAB for specific tire sizes. [The CAB sends a pulse stream to the PCM, which drives the speedo/odo; to change the calibration, the CAB needs to be told, among other things, the number of teeth on the RWAL sense ring and the rev/mi of the installed tires.]
So, if you change your tire size and your dealer hasn't a clue as to correcting the speed/odo, point him to the Chassis Diagnostic Manual, section 29A. It's all there.
Fest3er
NOTE: the 98 1/2 models do not use speedometer gears and the speed metering is taken from the ABS sensors. To change "gears" for different tire sizes requires reprogramming of the PCM. Dealers have been having problems with this procedure, and many axle ratio/tire size combinations are not available.
Date: Fri, 13 Mar 98 20:53:20 CST
From: "Fest3er" <murphyn@mc.net>
To: cummins
Stopped at my Friendly Dodge Dealer this morning on the way to work and inquired about the procedure for programming the CAB. He looked in the service manual, looked in a couple others and finally dragged out the Chassis Diagnostic Manual. There, in section 29A, it explains the procedure needed to program the CAB for specific tire sizes. [The CAB sends a pulse stream to the PCM, which drives the speedo/odo; to change the calibration, the CAB needs to be told, among other things, the number of teeth on the RWAL sense ring and the rev/mi of the installed tires.]
So, if you change your tire size and your dealer hasn't a clue as to correcting the speed/odo, point him to the Chassis Diagnostic Manual, section 29A. It's all there.
Fest3er
NOTE: the 98 1/2 models do not use speedometer gears and the speed metering is taken from the ABS sensors. To change "gears" for different tire sizes requires reprogramming of the PCM. Dealers have been having problems with this procedure, and many axle ratio/tire size combinations are not available.