Not to hijack the thread - but for anyone with an '06 and 3.73s wanting to get a new speedo gear for 32s...it is only available through your dealership. If you look in the usual catalogs you'll notice the 32 tooth gear is only available up to '05 models. Not sure yet what they'll rip me off for it - I may just leave it alone.
I'm still wondering if the computer can be flashed on an '06 to compensate the speedo without a new gear??