I can't remember if it does or not. I may go back to 265s and I'm wondering if my trans would shift strangely if I didn't get the speedo recal done right away..

 

it shouldn't, shift should be caused by engine rpm i'm pretty sure

 

on mine it does. when i ran the stock 265's OD would lock at 45, now with the 315's it doesnt lock till 50....just my .02$ hopefully someone else will chime in.

 

yeah it will change shift points when i put my 37's on it shifted weird then had it reflashed made a world of diffence in the shifting and power.

 

ryans05 where did you get the need revolution per mile number for the 37's i have the 315's and cant find it.

 

the dealer near me did it for me .

 

most tire manufacturer will have that info on thier website.

 

Thanks guys. Tirerack.com gives the revs with the specs on their tires.

 

The 315s are 601 revs per mile. Set to 601, my speedo is dead accurate against a GPS at all speeds.

 

Ok thanks guys headin over to the dealer this afternoon

 

I called a local dealer and they told me that they can only program in "stock tire sizes", and not an arbitrary rotations-per-mile. Is this the case? If so, what "stock combo" works for 4.10s and 315s?

 

Try another dealer. They either dont know how, dont want to mess with it or dont want to do something that might upset Star.

It is a 5 minute job with the DRBIII tool connected. It is an option in the ABS section for "Pinion Factor".

My dealer did it for free in about 5 minutes.

 

HA! This dealer wanted $89.95 just to "try". They can kiss my ***....

 

Is it possible to purchase one of those DRBIII tools?

I have seen some that just tell you what the codes are ($90 or so) but some also allow resets of codes and maybe more? I'm not talking about spending $600 or so for the dealer types but more like $150 - $225 or so for a good one that will do possibly more then seeing the codes.

Would that allow the DIY guy to do some stuff by himself?

 

I'm pretty sure I know the Dealer you are speaking of....I was told the exact same thing.