Engine/Transmission (1994 - 1998) Speedometer Fix

[EWalshak]

I just switched out the ring and pinion in a 98' 2500 2wd. Out with the 4. 10 and in with the 3. 55. Can anyone tell me how to correct my speedometer. Im not sure if it even has a computer to reprogram or if I can replace the gear in the trans. Thanks in advance for any help. Im a newby.

 

[hsmith]

I'm thinking you can do with a driver gear change in the transmission speed sensor. This old brain is slow tonight, but I think you want to go with a couple fewer teeth, but not sure.

 

[CumminsPower98]

'98 and up are fully electronic. The speed signal is taken from the ABS sensor in the rear diff. The dealer can calibrate it or you can buy a box. I personally have the Super Lift Tru-Speed since I run larger than stock tires. This box has a toggle switch so you can run two different tire sizes with the flip of a switch. I have had it for a long time now and had no problems. I do have two tire sizes so it has come in really handy.

 

[hsmith]

Thanks for the correct info. Knew mine uses the sensor in the transmission.

 

[EWalshak]

Can i replace the abs sensor in the rear diff to one that is for a 3. 55 geared truck?

 

[CumminsPower98]

No, the sensors will be the same. The difference is in the PCM programing.

 

[kenny61]

I think Rickson truck sells units for both newer and older trucks