Trying to get info on what all is involved in making the speedo run right with some bigger tires? I figure it will be dealership, or, can I do it with most tuners? Will my trip computer need anything done to it?? Kinda bummed the new baby only has 3.73's. I was gonna do 305's but i might just do 285's now......

 

The computer can be changed to deal with some limited variations in tire size, but I don't know to what extent in Gen II. Mine is quite a bit off (indicated 76 is 80). I just live with it.

 

SC3815 can make tire adjustments. Did mine recently and it took longer since i am stacked but its spot on with my GPS.

 

Most tuners can do the speedo recalibration nowadays and of course the dealer can do it for you as well for tires up to 34" (for a fee).

3.73s kinda suck for big tires on a 2500, but at least be glad you didn't buy a MegaCab. IMO Mega's shouldn't even be available with a gas engine and anything less than 4.10s...

 

Funny you said that hammer. I was looking at a megacab with a hemi and decided that it was too much truck for a gas engine. I was hoping for 3.92's but got the build sheet and was sad to see 3.73's. I would guess the trip computer goes off your speedo right? I kinda like things to work the way they should from the factory (some exceptions of course).