speedo

[Sixpack]

I read a few weeks back that someone took their pickup to the stealer and had them look up how to reprogram the PCM for larger wheels and tires. Now my question is: can they only adjust to accomondate the combos that are available for the truck from the factory or can they adjust for after market tires also?

TIA Phil

 

[Bill_L]

I know that the dealer can do it but I am not sure that I would have the dealer do this. I know that I could have had them do the change for my 4. 10 gears and maybe for the 36 inch tires but I do not know if they can adjust it that far.



I would get an elecronic ratio adaptor. I have seen some in the $80 range. That is much better than the $170 I paid for mine that has the cool Superlift sticker on it.



Its a simple 4 wire hook up and takes maybe 30 minutes.



Bill

 

[RBallard]

I tried this with my 98 gasser, the dealer could only change between the factory tire sizes (265/75 max). I don' t believe axle ratio could even be changed.

 

[rono]

I called my dealer the other day after installing 315's and asked about reprogramming for larger tire sizes and I was told that it could not be done. I don't think I'll take my truck to them for ANYTHING! Now, can this be done with the DRB tool? I have a friend who has one.

Ron

 

[JR2]

Rballard is correct. The dealer can only set it other stick tire sizes. The best option is to buy one of the aftermarket adjusters from abbot or Rickson... or whoever.

 

[joel]

they can set other tire sizes.....

You just have to tell them how many revolutions per mile. There is a pretty limited range that the computer will accept, though, at least on my 98. 5. I went from the stock 245s to a 265 and I think even that was too low! I had them put in the lowest number they could, but it still seems to be a little off - not so much that I worry about it.