The issue with the odometer not working while the speedometer functions correctly in your 1991 Dodge truck is likely due to a problem with the odometer's internal gears or the odometer drive assembly. These components can wear out or become damaged over time, affecting the odometer's ability to record mileage. Additionally, a malfunctioning speed sensor or wiring issue may also contribute to this problem, though it's less common when the speedometer is still operational. Checking the odometer gears and connections may help identify the exact cause.
If the abs light is on, then you might have a rear axle speed sensor issue. If not, then you have a cluster problem.
you have to get anew speedometer,speedy bo peep.
The speedometer and odometer are electrically operated. There is no mechanical connection to the drivetrain. If there is no power, they don't work.
The odometer can show up to 999,999 miles
A 2001 Dodge truck odometer typically has six digits. This means it can display mileage from 0 to 999,999 miles. Some models may have a trip odometer feature as well, but the main odometer itself generally consists of six digits.
A 2001 Dodge truck does not have a speedometer cable. The speed signal comes from the rear axle speed sensor. (the sensor on top of the center of the rear axle)
A 1999 Dodge Ram truck typically came with a 5-digit odometer. This means it could display mileage up to 99,999 miles before rolling over to zero. If the truck has a digital display, it may have a different format, but the standard mechanical odometer was 5 digits.
The speedometer does not have a cable on a 1994. It is run by a sesnor on the rear of the trans/t-case.
If both the speedometer and odometer stopped working it is probably the speed sensor in the transmission gone bad. If only the speedometer quit you may have to replace the dash cluster with a reconditioned unit.
To replace the speedometer cable on a 1988 Dodge Ram truck, first, disconnect the negative battery terminal for safety. Locate the speedometer cable at the back of the speedometer gauge and at the transmission; unscrew the retaining nut to detach the cable from both ends. Install the new speedometer cable by connecting it to the transmission first, then to the speedometer, ensuring it is securely fastened. Finally, reconnect the battery and test the speedometer for proper operation.
If the grinding sound seems to be coming from the speedometer and grinds faster as your speed increases, the likely cause is the speedometer cable. At least some 1990 Dodge trucks (mine) have electric speedometers Len
It can change the accuracy of the speedometer.