Outer Limits 4x4 Board

hey guys.. id like some ideas/imput on diff ratios on my mav shorty. currently have 3.9 ratios, 4.2 auto on straight lpg, 33 inch mtr's.
i have found that the drivability has been shot to bits on the 33's. the overdrive is next to useless unless im doin about 130k/h plus. other day on way home from woolongong i was doin 150ks on my speedo and only had 2300 rpm on the tacho. down low is sluggish too....

i have sourced my self a pair of 4.3 (rear lsd) diff gears and a pair of 4.6 diff gears no rear lsd. what gears do u guys think i should run with? both sets are in good condition, and i could use my lsd out of the 3.9 ratios to make the 4.6 lsd. im planning to keep the 33's as my road tyres, but will be using 35's off road.

any ideas would be greatly apreciated...thanks in advance steve

I'd say 4.3s, but I'd also say put in a manual gearbox

Basically you're looking at increasing ratio at least bu .1 per inch in tyre size...

If you were just gonna be using 33"s I'd say the 4.3 diffs. If you want to run 35"s I'd say the 4.6.

I'd also agree... get a manual

the 33's will be the main tyres, and the 35's +? for playing when i will be in low range anyways...

have u guys offroaded a auto? do it and u will u never own a manual again....

ok, you have 3.9's now, and it originally had 31" tires,

id say go to 4.1's if you were going to stay at 33's

but if you wanna run 35's got the 4.3's,

but if you want your gearin a tad lower, go the 4.6's,

in the patrol, for each tire increase, increae to the next diff ratio

ozy1 wrote:ok, you have 3.9's now, and it originally had 31" tires,

id say go to 4.1's if you were going to stay at 33's

but if you wanna run 35's got the 4.3's,

but if you want your gearin a tad lower, go the 4.6's,

in the patrol, for each tire increase, increae to the next diff ratio

Most of those cars that came with 3.9 diff ratios also came out with only 29"tyres.
So then your upgrades should be very similar to the normal Patrol's ie
3.9 = 29"tyre
4.1 = 31"
4.3 = 33"
4.6 = 35"

If you plan on only running a 33" tyre 90% of the time go the 4.3's. Cos if you go 4.6 when running the 33's it will be reving about 300rpm higher and with a TB42 this really wouldn't help the economy.

they had 29" tyres? i wasnt aware of that, thatd be farked

turps wrote:

ozy1 wrote:ok, you have 3.9's now, and it originally had 31" tires,

id say go to 4.1's if you were going to stay at 33's

but if you wanna run 35's got the 4.3's,

but if you want your gearin a tad lower, go the 4.6's,

in the patrol, for each tire increase, increae to the next diff ratio

Most of those cars that came with 3.9 diff ratios also came out with only 29"tyres.
So then your upgrades should be very similar to the normal Patrol's ie
3.9 = 29"tyre
4.1 = 31"
4.3 = 33"
4.6 = 35"

If you plan on only running a 33" tyre 90% of the time go the 4.3's. Cos if you go 4.6 when running the 33's it will be reving about 300rpm higher and with a TB42 this really wouldn't help the economy.

i know of 2 '89 4.2 petrol patrols, my auto and a mates manual maverick, both 3.9 ratio, both originally had 31" tyres. the mav runs 35" tyres now, and still has the power for donuts in front of work.

4.3 is better than 3.9 and will make a huge difference on your gearing. Will also be cheaper to run on the 33's. Do you have extractors. Aswell as an upperlube kit.

no extractors or upper lube kit..but have 2.5 inch straight through exhaust system. is the upper lube kit worth fitting? gas mech said not neccessary in patrols.. already have stellite valve or valve seats...not sure. as for extractors.. any body wanna sell me some?

im tending toward the 4.3's..ill fit then tomoorow arvo to back diff and see how it feels.. then the 4.6 and feel the diffrence.. then match the front to the ratio of choice

already have stellite valve or valve seats - Quote - I believe that it is worth it as on gas the engines tend to run dry. Extractors are your numberone freind for more power out off your 4.2. Will help to turn those 35's.

I reckon you go 4.6
and sell me the 4.3s..

Then again I would say since they were 3.9 stock, 4.1 would be good enough..

its about 300rpm change per diff ratio..

When the auto spits it's lunch it will be cheaper to fit the manual and you will be pleased with the extra punch available.
J Top

im fitting up the 4.3s today.. think this maybe the way to go...

turps wrote:

ozy1 wrote:ok, you have 3.9's now, and it originally had 31" tires,

id say go to 4.1's if you were going to stay at 33's

but if you wanna run 35's got the 4.3's,

but if you want your gearin a tad lower, go the 4.6's,

in the patrol, for each tire increase, increae to the next diff ratio

Most of those cars that came with 3.9 diff ratios also came out with only 29"tyres.
So then your upgrades should be very similar to the normal Patrol's ie
3.9 = 29"tyre
4.1 = 31"
4.3 = 33"
4.6 = 35"

If you plan on only running a 33" tyre 90% of the time go the 4.3's. Cos if you go 4.6 when running the 33's it will be reving about 300rpm higher and with a TB42 this really wouldn't help the economy.

This is what's weird with mine,

a) it came with 30" tread when I bought it 2nd hand
b) it should have come with 31" --> 4.1's
c) it has 4.6's ??

84 MQ SWB L28 --> did they all come with 4.6's for a reason or what?

foad wrote:a) it came with 30" tread when I bought it 2nd hand
b) it should have come with 31" --> 4.1's
c) it has 4.6's ??

a) wow
b) Its written on your compliance plate what it "came" with from factory
c) you have removed them to check this?

bogged wrote:

foad wrote:a) it came with 30" tread when I bought it 2nd hand
b) it should have come with 31" --> 4.1's
c) it has 4.6's ??

a) wow
b) Its written on your compliance plate what it "came" with from factory
c) you have removed them to check this?

Going by the speedo (on a gps) and compared to someone else I figured it had 4.6's, I haven't taken the plate off to find out for sure though.

Where on the compliance plate does it say tyre size?

foad wrote:Where on the compliance plate does it say tyre size?

will say HG41 or HG43 or HG39
4.1 4.3 or 3.9

foad wrote:

bogged wrote:

foad wrote:a) it came with 30" tread when I bought it 2nd hand
b) it should have come with 31" --> 4.1's
c) it has 4.6's ??

a) wow
b) Its written on your compliance plate what it "came" with from factory
c) you have removed them to check this?

Going by the speedo (on a gps) and compared to someone else I figured it had 4.6's, I haven't taken the plate off to find out for sure though.

Where on the compliance plate does it say tyre size?

Foad if we where all talking about the same model of car it would make it easier. As we are talking about GQ's in the this thread.
If you need to work out what an MK/MQ had might be worth starting a new thread.
And yes some mavs came from the factory with 29" tyres (thats factory not dealer).

turps wrote:And yes some mavs came from the factory with 29" tyres (thats factory not dealer).

My Mav has 29s but with 4.1s

MKPatrolGuy wrote:[quote="turpsAnd yes some mavs came from the factory with 29" tyres (thats factory not dealer).

My Mav has 29s but with 4.1s[/quote]

Dave would you stop making thing hard.
There is some wierd combo's out there. And I reckon this one is one of the owners has put little wheels on.

turps wrote:

MKPatrolGuy wrote:

turps wrote:And yes some mavs came from the factory with 29" tyres (thats factory not dealer).

My Mav has 29s but with 4.1s

Dave would you stop making thing hard.
There is some wierd combo's out there. And I reckon this one is one of the owners has put little wheels on.

To make it even harder. I have known the previous owner for a long time and it is the combo he bought it with.

bogged wrote:

foad wrote:Where on the compliance plate does it say tyre size?

will say HG41 or HG43 or HG39
4.1 4.3 or 3.9

HG46 on both the MK and the MQ