Final drive gearing

[timbo2410]

Went from the standard 31's to 33's in the tyre department a while back and it's so much nicer on road and off .. only issue is, she aint that great on the old hills any more (and that's without a trailer) .. the 3.0 just hasnt got the legs .. is there a way of changing diff ratio to compensate ? or is it gearbox ratio?

[mudnut]

4.3 to 1, 4.1 to 1 and 3.9 to 1 diff ratios are commonly available.

[MB]

G’Evening Timbo Mate,
You definitely can change the ratios on your front and rear differentials (crown & pinion).
May I Nuffy suggest exploring here and elsewhere slight/minor and or extreme 3.0L engine modifications as a possible cheaper, less greasy/heavy first step.
It’s not a huge tyre rolling diameter change you’ve made and could be hopefully sorted out by squeezing a few little extra engine Killer Wasps out of Her


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[mihit]

Don't quote me, but I think some TD42s came out with a 4.8 diff which is what all the real mud sluts run.
4.1 (what I run, 33s, NA, TD42), 4.3 (??) and 4.6 (TD28) all common enough.

The 3.9 diffs were on petrol autos and...you don't want them.


But yes... probably more suitable to upgrade the donk. "slap a turbo on it"... or upgrade to the qd32, or td...

[mudnut]

Don't quote me, but I think some TD42s came out with a 4.8 diff which is what all the real mud sluts run.
4.1 (what I run, 33s, NA, TD42), 4.3 (??) and 4.6 (TD28) all common enough.

The 3.9 diffs were on petrol autos and...you don't want them.


But yes... probably more suitable to upgrade the donk. "slap a turbo on it"... or upgrade to the qd32, or td...

4.3 is for the RB30.

[MB]

………
..
The 3.9 diffs were on petrol autos and...you don't want them.


………..qd32td...

Apologies for quoting @mihit Legend Mate

Our old family ‘GU TD42T 2002 3.5T towing legal Manual’ variant Wagoooon did have them horrible highway 3.9’s too

Rest assured Folks, sounds like New Zealand and certainly most of the Mountainous East Coast of Straya have almost eradicated them pesky 3.9’s, relocated actually over to Western Australia by PatrolApart, as its flat as a Shit-Carters hat ……150kmph tail wind boat towing fishing fuel saving needs


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[Hodge]

Rest assured Folks, sounds like New Zealand and certainly most of the Mountainous East Coast of Straya have almost eradicated them pesky 3.9’s,

"Almost" eradicated Marko mate. Lol
There's a set still getting me around the place..
Future plans to amend that ...

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[timbo2410]

I must admit a few more horses would be nice ..but .. I do miss a lower crawling speed as well. Especially on some of the rougher slower tracks around our neck of the woods.

[pollenface]

What's your vehicle? What year/engine/gearbox?

[Stropp]

Apologies for quoting @mihit Legend Mate

Our old family ‘GU TD42T 2002 3.5T towing legal Manual’ variant Wagoooon did have them horrible highway 3.9’s too

Rest assured Folks, sounds like New Zealand and certainly most of the Mountainous East Coast of Straya have almost eradicated them pesky 3.9’s, relocated actually over to Western Australia by PatrolApart, as its flat as a Shit-Carters hat ……150kmph tail wind boat towing fishing fuel saving needs


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I still have 3.9 in WA but would change to 4.11, patrolapart send a lot to Brunswick diesels as they use them in their v8 conversions as most 3 LTR have 4.11 from my understanding