Reply With QuoteProbably Dana... but they're not going to fit!Originally Posted by grover7488
Master
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?!!
Swaggie
Probably Dana... but they're not going to fit!
Cheers
Slunnie
~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~
Master
gee thanks slunnie
i ment ones that would fit
good news for those dirty J%^p owners i suppose!
AT REST
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.
Last edited by Tank; 11th October 2008 at 10:43 AM. Reason: 500metres was incorrect, should have read 50 metres.
Swaggie
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.
Cheers
Slunnie
~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~
AT REST
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
YarnMaster
1% - you must be pretty bloody happy with that!
AT REST
Close enough for me, Regards Frank.
Master
Now who makes the best 4.11s?!! ??????????????????????
as I should get a set.
32's on a D1
Swaggie
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.
Cheers
Slunnie
~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~
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