Thread: D1 Diff gears, price and ratios

Originally Posted by 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

(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.

How would this go?

TC 1.003
MDE low range
Dif 4.7
with GNK Overdrive

Originally Posted by hook

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.

Originally Posted by Slunnie

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

Originally Posted by rovercare

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.

Originally Posted by Slunnie

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

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