i just went from a 2.78 (i think) to a 3.55 in my 308 wih supra 5 speed. first is now for towing or tree stump removal! The 2.78 was too tall. I could barely get it in 5th on the freeway at 100k's. I didnt need 4th ever around town. Much nippier now but i reckon 3.08 would probably be a good middle ground too