Originally Posted by jon.silverson
So my girlfriend and I just bought me the Jeep. It's been lifted and it's got 35x12.50r15 tires. The guy at 4 Wheel Parts wants me to buy a $300 programmer to correct the speedo and automatic transmission oh, and give it more "balls". My question is, does anybody have one that they'd be willing to "program" my Jeep? I can provide beer, or a little bit of cash for the time...
JK speedo's are done electronically, TJ's are a much easier unit to adjust, "except" for the rubicon t-cases if I'm not mistaken.
I think they (4wheelparts) are going about it wrong here.. don't spend your hard earned money on a programmer.
All you really should need is this changed.
Changing Your Jeep Speedometer Gear
If you don't know what your axle ratio is then pm me, and I'll walk you through how to find out what you have with out pulling the diff cover off..
If you want more balls.. the only real way is changing your gears most likely.. especially if you are only running 3.73's or numerically lower.