Thanks for doing the maths Scottie and yes i have thought about this and had some txts with Matt (who has diffs some for sale!).. The trouble is 2 fold; firstly i would still need to get a 4.16 box and buy the diffs - which will also be more expensive than a 5:1 or above, and secondly i am really short on time these days so swapping a box is one thing but changing diffs another....ScottieJ wrote:Some food for thought.
Presuming that your jimny has 3.909 diffs at the moment and the Tbox is 1.32 in hi and 2.145 lo (i don't know what year, engine it is so that's a guess??)
As stock they run 205/70 tyres so 26" tall.
This means stock is
hi 5th at 4000rpm= 59.9mph
lo 5th at 4000rpm= 36.9mph
With a true 33" tyre, a 4.16:1 tbox and 4.3 diffs.
hi 5th 4000rpm= 57.8mph
lo 5th 4000rpm= 21.9mph
33s, 4.16:1 tbox with 4.090 diffs.
hi 5th 4000rpm= 60.7mph
lo 5th 4000rpm= 23.1mph
33s, 5.1:1 with 3.909 diffs
hi 5th 4000rpm=58.9mph
lo 5th 4000rpm= 19.7mph
33s, 6:1 with 3.909 diffs
hi 5th 4000rpm=57.7mph
lo 5th 4000rpm= 16.7mph
So There's not really much in it at all. I actually think a 4.16 box and 4.3 diffs would be the best option, it's actually lower in low than my sj.
And if i had the time i would be building my ultimate SJ!
But yes it is an option...
