I am installing 34 x 10.5 LTB swampers on my new truck. I would like to correct my speedo. Can anyone help?<br><br><br>jt

 

This page might help with calculations

 

I have been using the Superlift Tru-speed to correct the speedometer. Works with 4 wheel ABS too.<br><br>http://www.superlift.com/speedcal.asp

 

If I'm correct, he needs a new speedo gear to correct his since his isn't controlled by a computer. I think that's right. I'm not sure though.

 

He said &quot;new truck&quot;. So I assume that he hasn't updated his signature yet. You know what they say about assume

 

I have 35's and use the Abbott ERA.... Costs $150, and speedo is dead on! Got mine from Jannetty Racing.

 

MY new truck is listed at the bottom of my details, still have the 12 valve.<br><br>jt

 

[quote author=DEZLPWR link=board=7;threadid=11456;start=0#109430 date=1046292883]<br>I have 35's and use the Abbott ERA.... Costs $150, and speedo is dead on! Got mine from Jannetty Racing. <br>[/quote]<br><br>Does your '99 have 4 wheel anti-lock brakes though? I'm debating whether or not to even attempt to use the new Abbott box I just bought. thanks.

 

Thanks for the reply Commando. I have the 3.55's and I just went to 315/75-16's which are, on paper, 34.6'' tall. How is it that no one else has suggested changing this gear? I thought it was only possible on the earlier models. I do have a 2002. Thanks again.<br><br>Udaloy

 

2002's don't have the speedo gear.<br>We have to do it electronically.<br><br>Either by haveing the dealer reflash the PCM with the correct tire size (only up to 265 though) or getting an aftermarket &quot;box&quot; to correct the speedometer.<br><br>Either the Superlift Truespeed or the Abbot ERA.<br><br>For now, I'm using the GPS for Speedo/odo correction.<br><br><br>phox