this is a very good topic..... i had to make this decision a month ago. i went with 529 yukon gears also got the set-up kit. the reason i went with 529's and not 488 is because im not going to be able to afford dual cases till next year (tax return) ive read on pirate that if you run dual cases you want to go with 488's why i forgot i looked for the tread but was unable to find it. i drive my truck daily gas mileage is great power is very good on the street and my drive-train is under less stress. not to mention i still have stock t-case and tranny also i plan on runnin 37 after i do dual t-cases. like a few people already said BREAK IN THE GEARS or you will have problems.... good luck with the gearing
