hi can anyone help me out?, my little ute revs its head off at about 80kph, how can i get more top end and improve the performance?
im putting a turbo set up on it very soon,oh yeah its an a15 4 speed, also what diffs fit?

thanks for any advice.

the diff head from a bluebird wagon should fit. They came in a 3.9:1. The utes have the 4.1:1.
Although the series 3 bluey's have the larger H190.(or so I'm told.)
The easiest way is to fit wheels with a larger rolling circumference.

sweet, thanks. yeah im going to put bigger wheels on it soonish, thats another prob to deal with later. (what ones??)

hey is it a 1000 ute, your ute dyna?

it a 1200 4 speed a15 standard diff.

Well if you're putting a turbo on it you've pretty much answered your own question.

If you are talking about 'in the meantime' maybe purchase a weber downdraft 32/36, get some extractors and do some work to the cam. Then upgrade the diff so your ratio's are a little more reasonable.

Putting bigger wheels would definitely help things along.

So of course if you reduce the RPMs by changing diff or larger tires, the tradeoff is slower acceleration.

The A12 is designed to rev all day at 4500 rpm, so no worries about that.

Depends on what you want. The ultimate solution is a 5-speed: keep you acceralation through the gears while having the overdrive gear to reduce revs.