disco 1 4.11 gears and lockers

To work out suitable diff ratio you need to know
a) original ratio
b) standard tyre size vehicle was fitted with

Example For a D2
a) = 3.54
b) = 29"

New tyre size, say 33"
33"-29"= 4"
4" / 29"= 0.1379 Therefore an increase of 13.79%

original diff ratio X increase %
3.54 x 1.1379 = 4.028


Using this method you can work backward from 4.11 to see what the optimum tyre size would be
4.11 / 3.54 = 1.161 (or 16%)

29" X 1.161 = 33.67" (or 855mm!!!!)

Now who makes the best 4.11s?!!

Quote:

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Originally Posted by grover7488

Now who makes the best 4.11s?!!

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Probably Dana... but they're not going to fit! :D

gee thanks slunnie:tease:

i ment ones that would fit:wallbash:

good news for those dirty J%^p owners i suppose!

I run 33"'s with 4.11 in my Auto Disco and the odometer (speedo) is out by 50 metres over a measured 5klms. so 33's and 4.11 do not return my gearing to standard, Regards Frank.

Quote:

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Originally Posted by Tank

I run 33"'s with 4.11 in my Auto Disco and the odometer (speedo) is out by 500 metres over a measured 5klms. so 33's and 4.11 do not return my gearing to standard, Regards Frank.

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Which 33's? 255/85 (33.4) will be very close according to the calcs above, though 285/75 (32.7) will be a little further out. Your reading seems to be a long way out, as if 3.9's were fitted almost.

Quote:

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Originally Posted by Slunnie

Which 33's? 255/85 (33.4) will be very close according to the calcs above, though 285/75 (32.7) will be a little further out. Your reading seems to be a long way out, as if 3.9's were fitted almost.

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Slunnie sorry mate, should read 50 metres short at 5 klms and according to my Sat nav I am travelling at 105klm/h at an indicated (Disco speedo) 100klm/h, tyres are Nankang Mudstar 33x12.5x15 on 15x8" rims

Quote:

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Originally Posted by Tank

Slunnie sorry mate, should read 50 metres short at 5 klms and according to my Sat nav I am travelling at 105klm/h at an indicated (Disco speedo) 100klm/h, tyres are Nankang Mudstar 33x12.5x15 on 15x8" rims

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1% - you must be pretty bloody happy with that!

Quote:

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Originally Posted by B92 8NW

1% - you must be pretty bloody happy with that!

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Close enough for me, Regards Frank.

Now who makes the best 4.11s?!! ??????????????????????

as I should get a set.


32's on a D1

Quote:

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Originally Posted by hook

Now who makes the best 4.11s?!! ??????????????????????

as I should get a set.


32's on a D1

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I'm not sure if there are any other options, but there is Ashcroft with 4.11 and there is KAM with 4.1.

The 4.11 (9/37) is typically a stronger way to setup the gears over 4.1 (10/41) as the gears are bigger. I'm pretty sure Dave (Ashcroft) has also said that his 4.11's will also allow you to maintain the rotoflex type tailshaft if you don't want to change that to a uni-uni type shaft.

I think Dave may deal direct, but 4x4Intelligence may also have/get them. I bought a spare through them and the price was good.