$3K for a celica box ?? One just sold here recently for $1050. D: mite have a 3.7 for sale

simple to work out. You're interested in revs at 100 or 110kph? Take your revs at that speed, divide by 4.11 and multiply by your intended ratio.

eg if you're doing 3700rpm at 100kph and thinking about a 3.9 diff:
3700/4.11*3.9=3500rpm

try here its what i use
http://www.wallaceracing.com/
cheers

looking for a series 1,2 bluebird with h165 diff is where you need to start looking. 3.7 diff is what you need. My 180rwkw ca18det 1200 has a 3.45 diff and its no fun on acceleration but is good on the freeway.

your most available option is 3.9, and a bit harder to get is 3.7

there is calculators on the net you can enter your speed/tyre size/diff ratio/gear ratio and it will tell you the rpm, then you can enter with a different diff ratio and see the new rpm. best to use that maths than someones "experience" anyway

you will obviously be cutting acceleration, and it is noticable, but if you have a nice wide power range with your turbo it may not be such a problem

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