Outer Limits 4x4 Board

THis is for a TB42 on gas

i got 3.9s on my car at the moment and it came with 31s

currently i run 33s on the road and 35s off road, would diff ratios's would people recommend?

i have been told to go 4.6s but will running 33s on the road just increase the revs to high and drain the juice.

This car is a daily driver and spends more time on the road than offroad by far.

I dont mind a sllight increase at revs with changing ratios, but i dont want a big one that will completely stuff up my road driving (over reving)

Also my next set of racing slicks (road tyres) will be 35s, but that still about 1 year away.

i know genuine rear and aftermarket front is the go, just need to decide on which ones.

at the moment i am doing 2400rpm at 110 after taking in consideration of the speedo being out, where with the 31s i was doing 2600rpm, if that means anything.

on diesels its 300rpm per ratio ...

Put some 31's on see what RPM you get at 100kph then 33s then 35s.
You can work out for yourself what ratio you want to go with.

3.9 with 31 is same as 4.1 with 33
4.1 with 31 is same as 4.3 with 35

Keep your 3.9s and spend the money on crawler gears for 4WD Low.

Jason

matey i just changed my complete centres front and back last week.. mine is tb42 straight gas and auto, 33mtr's on road and 35's off road. i changed from the 3.9's to 4.3's. feels like a whole new vehical. go 4.3's and u wont look back. let low range take care of the 35's off road.

4.3 are also the hardest to find.

I agree i would go 4.3 i will be doing that to my wagon

Peter, you know my opinion

My mav had 3.9's, I replaced them with 4.3's and run 33's on the road, 35's in the bush with a turbo diesel.

Go the 4.6's!!!!!!

The 35x11.5 peed ( measures 35.5inch ) takes ALOT of turning compaired to my old 34's.

Buy some genuine 4.6's and I'll sway you my genuine 4.3's

bundyrum4x4 wrote:Buy some genuine 4.6's and I'll sway you my genuine 4.3's

if you do decide to go 4.6, call me.. I'm only a stones throw from the top of the hill there at Martha.

greg, i aint swapping ya if i go 4.6s

so 4.3s are suited for 35s for my vehicle? if that is the case, 4.6s then would be too much overkill for the 33s on the road.

4.6 will still be OK. You will be doing about 2 to 3oo more rpms at 100ks. How often do you cruise at thet speed? Also 25/2600 at 100 is not out of the cruise range for a 4.2 6 in line petrol.

Bazzle

hottiemonster wrote:so 4.3s are suited for 35s for my vehicle? if that is the case, 4.6s then would be too much overkill for the 33s on the road.

Pete just remember you car came from teh factory with 29"tyres.

SO the usual rule applies-
3.9=29"
4.1=31"
4.3=33"
4.6=35"

This only works for the 4.2lt engines

turps wrote:

hottiemonster wrote:so 4.3s are suited for 35s for my vehicle? if that is the case, 4.6s then would be too much overkill for the 33s on the road.

Pete just remember you car came from teh factory with 29"tyres.

SO the usual rule applies-
3.9=29"
4.1=31"
4.3=33"
4.6=35"

This only works for the 4.2lt engines

you have said this a lot, but my patrol and a mates mav, both came with 10r ( near as damnit to 31's) tyres. both are factory 3.9 ratio.

carl how do u know it came with 29s?

i know its wide wheel pack with flares, and the gold rims for the XLT models, since mine is XLT.


grrrr so confusing.

3.9 were stock with both 29s and 31s on at least some vehicles.

Jason

since your going to change to 35's later on i would definately go 4.6's.

4.6 are the shyt anything under you will regret. 300rpm more at 100kph man thats nothing.( Stop sitting too piss.)

Just get power!
Then the gearing doesn't matter!

OK I am wrong and Juzza is right. POWER

hottiemonster wrote:carl how do u know it came with 29s?

i know its wide wheel pack with flares, and the gold rims for the XLT models, since mine is XLT.


grrrr so confusing.

More mavs came with 3.9 and 29" tyres than any other combo. Mavs with 3.9s often had 31" tyres fitted as a dealer option (ie not factory) this is the wide wheel pack.

But I am sort of with Juzza on this, although you could do with some lower ratio's. Power i the key for most stuff in VIC (atleast with the stuff I have seen you drive). Maybe transfer gears maybe a better option and should be about the same price fitted.

transfer gears? how would that give power? it would only make gearing alot lower.

how much would a v8 conversion cost, including motor and fitted etc?

hottiemonster wrote:transfer gears? how would that give power? it would only make gearing alot lower.

how much would a v8 conversion cost, including motor and fitted etc?

V8 conversion would cost lots would be better to go gears and a turbo I think. Maybe just going EFI would give you abit more grunt (mind you. you still have heaps more than me).

As for transfer gears it changes the way the power is deliverd. So therically you would have more torque multiplication. So you would actually get away with a higher finalle ratio, than std. As it is easier for the motor to turn the wheels (bit like taking off in 1st instead of 2nd).

p.s it has been a big night so this maybe wrong/

Cheezy4x4 wrote:4.6 are the shyt anything under you will regret. 300rpm more at 100kph man thats nothing.( Stop sitting too piss.)

I second this

bundyrum4x4 wrote:

Cheezy4x4 wrote:4.6 are the shyt anything under you will regret. 300rpm more at 100kph man thats nothing.( Stop sitting too piss.)

I second this

you going out to dinner tonight greg? might see you there.

hottiemonster wrote:how much would a v8 conversion cost, including motor and fitted etc?

you doing all the work? you got the motor or getting one cheap? what v8?
Ask Ryan about his...

bogged wrote:

hottiemonster wrote:how much would a v8 conversion cost, including motor and fitted etc?

you doing all the work?

!!!!!

i have decided to go with diff gears, rather than t-case or engine swap

chimpboy wrote:

bogged wrote:

hottiemonster wrote:how much would a v8 conversion cost, including motor and fitted etc?

you doing all the work?

!!!!!

very true

If anyone wants it, I got a little spreadsheet I knocked up that looks at the effect of gearing/tyres/X-fer case ratios on ground speed.

Id have to email to you it as I cant seem to attach files etc at the moment.

If you want it, let me know you e-mail add.

Cheers,

Deano

FYI, I have some 4.3 and 4.6 OEM gears that I'm looking to sell...

http://www.outerlimits4x4.com/PHP_Modul ... p?p=325565