I am close to sending PHP my gryphon order but just want to make sure I am ordering it correctly. I will soon be running 37's, 4.88's, exhaust, and a CAI.

It seems most go with a stock tow, custom perf 89, and custom perf 91. My question is, you definetly don't need to keep the stock-tranny only option correct? Also, why wouldn't you want a custom tune for towing also? I know most tow less frequently, but if you have a CAI and other upgrades, wouldn't you need the custom tune to keep your truck running the best?

Thanks