Reprogramming the Speedo by Dealer -

[94prez]

Couldn't find this in a search. I know someone had posted (maybe on TDS) how to reprogram for 35" tires on an 04. My local dealer doesn't have any idea.

Anyone here have any idea?

Thanks in advance.

Phil

[RNUOVR3]

Got this off TDS. Here ya go.

Special Service Message 11789 & 11790 from 7/29/99.

1) Ensure all harness connections are plugged in.

2) Using Rotunda New Generation Star (NGS) scanner and Version 3.2 or higher Service Card, Plug into the DCL connector. [ADDED: Do not use a service card version later than early 2001 model year. This will not work if you try to use a service card dated after the 2002 models came out. But it will work on 2002 or earlier trucks if you use a Service Card for 2001 or earlier SuperDuties.]

3) Turn Key on w/Engine Off.
4) Select Service Bay Functions

5) Select ABS Module or 4WABS Module depending on application.

6) Select Tire Size/Axle Ratio Configure.

7) Enter tire manufacturer's specification of revs/mile (tire revolutions per mile) into the NGS as the REV.PER MILE figure.
• [ADDED: To be even more accurate, enter the following rev/mile:

For 285/75R16 tires enter 00636 = 33"
For 295/75R16 tires enter 00626
For 315/75R16 tires enter 00601 + 35"

Do not try to enter a number less than 00601.]

8) Select Tone Ring size and verify that 120 is programmed in.

9) Select Option and press TRIGGER.

10) Select Vehicle and press TRIGGER.

11) Press Done and the Module will be reprogrammed.

12) Check Speedo accuracy.

[94prez]

Thanks.

Merry Christmas.

Phil