so my car when it hit rev limiter(6000rpm i think) in 5th it was 204kph and with the new box limiter in 5th will be 234 kph
and if the rev limit it lifted to 7000 it should be good for 273 kph

well thats handy to know, also with the new .75:1 5th instead of the .86:1 means that i can run 4.11 instead of 3.7 and still have a higher top speed

check this link out guys

driveline calc

handy for seeing the effects that different ratios will have

i worked out that with my gearbox/diff/tyres
if i can get my ute to spin to 10,000rpm in 5th.. ill be doing 300km/h

I guess it depends how much you drive at highway speeds....or where you cruise.

I haven't had any other ratio other than what I'm running so I'd be interested to see how it all differs.

I rarely go near 100 so I'm cool with the current setup. But just curious abut what other ratios will offer.

Chris

i seriously think this obsession with lower numbered diff ratios is going to leave you with a really sluggish car. I used to get awesome fuel economy with my a14 when it was carb with 165 65 13's and a 4.3, at 100 it did rev high but seemed to chug along fine. i since changed to a 3.9 and while it helped keep the revs down to a nice level at 100 it certainly lost poke. It didn't matter too much with the injection and exhaust and cam being able to cover it up but with a more standard setup i think it would be a step backwards.

worth a try but you'll have a much slower car around town

Well Ive put my hand up in the past for a 3.545.
I might have a 3.7 to try out soon to replace the 3.9 in it
at the moment with Chris's spacer plate and Im pretty sure
it will improve things at 100km/h but not by much.

The 3.545 will be ideal with the 3sp auto 1:1 final drive
and 165/70/13 inch tires powered by the a12 but an A14/15
will definitely need a 3.5 at minimum in featherweight Ks.

$50 - 3.7 is really common here

Shipping to AUS might be as cheap as $55 USD. Depends on the dimensions of box needed.

So how much is a H150 3.7 New Old Stock ring & pinion worth? around about?

The cost of shipping will be more than the cost of new R&P.

The 3.545 ratio is not common here, but occasionally you might find one. Most B310 were fitted with 3.889 or 3.700.

DD any idea of the cost of these centres to get here?
There might be more than one person interested if its
affordable and if some money can go your way.

Id hate to think the off the shelve price for these
parts straight from Nissan.

Best tire sizes Ive found with the B10 over the years are

13inch -
165/70/13 = 561.2mm (cushy ride / cheap substitute for street)
185/60/13 = 552.2mm (close to stock diameter - best street/performance)
205/60/13 = 576.2mm (touches in some parts and too big overall for looks)
14inch
165/55/14 = 537.1mm (superb handling - track only unless good overdrive)
165/60/14 = 553.6mm (close to stock diameter - best/track performance)
175/60/14 = 565.4mm (cushy ride and good handling)

yes the 3.700 is enough for a larger motor

Here in USA they fitted 3.545 to some A14s.