D35 can handle 35s with the super kit as mentioned. Without the upgraded shafts, it's risky though. I met a guy at Rausch this summer who had a locked 35 w/ 33s and he wheeled harder than I did and ran all the black trails etc. Hard on the throttle and he said he has done it for years... Some d35s seem to grenade or blow a shaft very easily, while some seem to somehow survive the odds. I wouldn't risk it long term, and if you are going with an expensive locker and install, I would go with the whole Super35 kit.