D1 Diff gears, price and ratios

[Boxer]

Now that I'm running the 33s my Disco is a teeny bit lazy, especially on the freeway in 5th. Being a 96 5-speed V8i, what would the factory ratios be (I'm too lazy to go looking for them) and what would be the best upgrade. 4:11s?

Also, where do you get the new C/wheel and pinions an how much are they. I'm thinking ratio changes and maybe a couple of lockers might be on the cards.

ps: Sorry Stooge :)

[Xavie]

3.54 is standard off the top of my head. Common changed to 4.11.

[Blknight.aus]

wot he (^) said

[Disco_owner]

Mark;

Ashcroft 4.11 cwp's will set you back around xxxx for a set F/R from Karcraft , I have them on the Disco.

[hook]

OK,
now that we are talking diff ratios, do they get stronger or weaker as you go up from 3.54?????
are 4.7 (serries type) stronger then 4.11
or
3.54 stronger???

[klappers]

The higher the ratio the less likely you are to break a diff or axle etc....

[Slunnie]

The higher the ratio the less likely you are to break a diff or axle etc....
Thats with all things being equal. Aftermarket CW/P's are supposed to be stronger than OE ones, and I understand 4.11's to be as strong or stronger than Factory 3.54. Likewise 4.11's should be stronger than 4.1's due to tooth sizes.

[klappers]

Thats with all things being equal. Aftermarket CW/P's are supposed to be stronger than OE ones, and I understand 4.11's to be as strong or stronger than Factory 3.54. Likewise 4.11's should be stronger than 4.1's due to tooth sizes.

Ya.... 4.11 will still be stronger and you will break less stuff on these than stockers just because of the torque multiplying effect. 4.11 on 35" will be stronger than 3.6's on 32"

[Mundy]

Going from 3.54 to 4.11. all other things being equal, you are less likely to break anything from the engine to the diff but more likely to break something from the diff to the wheel ie axle.

[Cap]

ps: Sorry Stooge :)

What about dude?

Was talking to JC about something similar, except was wanting to reduce the gearing in low range as the autos are not that low. Now on the same vein, what about just changing the high range cog in the transfer case rather than 4:11's?

[dullbird]

watching with interest as i would like to reduce my low gears too as I too have an auto and its not slow enough for me on downward engine braking

[Cap]

watching with interest as i would like to reduce my low gears too as I too have an auto and its not slow enough for me on downward engine braking

(Dont want to hijack thread) but...

I had a quick chat with JustinC and it looks like its dooable to reduce the low range gearing in transfer case for less than what it costs for 4:11's

However, this only reduces the low range, high range remains same obviously which means if you ever put bigger rubber you either have to put 4:11's or do the high range transfer change too. Im no mechanic, but this is my understanding.

[hook]

How would this go?

TC 1.003
MDE low range
Dif 4.7
with GNK Overdrive

[Slunnie]

Who would this go?

TC 1.003
MDE low range
Dif 4.7
with GNK Overdrive

No way. The diffs will break with that ratio. IF you want to run 4.7's then Rover diffs are not your answer.


4.11's if you always run big tyres

MDE crawlers if you run big tyres when offroad and stockers onroad.

[rovercare]

No way. The diffs will break with that ratio. IF you want to run 4.7's then Rover diffs are not your answer.


4.11's if you always run big tyres

MDE crawlers if you run big tyres when offroad and stockers onroad.

KAM make 4.7:1;)

[Slunnie]

KAM make 4.7:1;)
True.

Interestingly, they compare the strength of their gears to the OE 4.7. The 4.75 is 50% stronger, the 3.8 is 70% stronger, but the 4.1 is 35% stronger. I wonder why they didn't use a 4.11 which I assume would be around 60% stronger than a 4.7.

[rovercare]

True.

Interestingly, they compare the strength of their gears to the OE 4.7. The 4.75 is 50% stronger, the 3.8 is 70% stronger, but the 4.1 is 35% stronger. I wonder why they didn't use a 4.11 which I assume would be around 60% stronger than a 4.7.

Dunno, but my KAM 4.1's never broke and they seen 2 county CV's to their death:D

Although I dropped the pinion of one on the concrete when handing them to the bloke that bought them....how embarrassing....lucky no damage:eek:

[klappers]

Dunno, but my KAM 4.1's never broke and they seen 2 county CV's to their death:D

Although I dropped the pinion of one on the concrete when handing them to the bloke that bought them....how embarrassing....lucky no damage:eek:

Hahaha thats funny as! Just as a random aside.. What is so good about county cv's and why are they so much better than stockers?