Im after a few tips with crusing speed on the main freeways. I have a 1200 ute with an A14 Turbo that revs its ares off when crusing on the freeway @100km/h. Yes i only have a 4 speed box and i did price a celica 5 speed with Dellow conversion kit. but i dont have a lazy $3000 sitting around at the moment. So i was thinking of changing the diff centre. i have the 4.11 diff at the moment with 15inch rims.

Any suggestions or experiences with this conversion would be great. Ive gone through Wiki and it tells me how to install etc but not what results i would get out of different ratio's