Is it needed right away?

 

Not really needed until you get bigger tires and/or gears.

 

That's a pretty vague question, and nobody can answer it for you...

How big of a tire are you going to? Which transmission do you have? Do you care that your speedo is off? Do you care that your odo is off? (even if you don't, the government probably does...) If you have an auto, do you care that your shift points are off? Will you use any or all of the functionality?

 

Goin with 35x12.5. I believe I have 4.10's but not sure. I don't do extreme wheeling.

 

I would say the procal is worth it if you're going to 35" tires. Going from 31" stock to 35" would make your speedo off by about 13% (will vary based on actual height). You can also adjust the threshold of your TPMS, or turn it off completely. I like not having to do the math in my head while I'm driving to know what my actual speed is.

 

Well worth it to correct your speedo and odometer. Mine was out 11 km/h after the 37's were installed.

 

Is there a specific one to go with?

 

A specific ProCal? Nope. There's only one.

If you want a tuner, you have a few options though. Superchips, Hypertech, Diablo. Just go out to their websites so you can compare the options each gives you.

For the low price and abundance of options, you can't go wrong with the procal.

 

I got mine when I got my tires on. In my book as soon as you get bigger tire you need to calibrate you speedometer and this is the best way to do it. A dealer will charge $100 for the calibration and you can get a Procal for $150 and be able to adjust other thing lick the tire pressure threshold. I don’t have the TPMS any more so I had to go with the Procal because it let me adjust the PSI to zero.

 

All the ones I see are 329 and up