Diff Ratio Change to 5.13 from 4.625

[Engism]

Thanks MD and also sorry for slow reply to this thread , (have a read of my reply to MB above for my findings so far) and to answer question on why 2 steps on ratio change I looked at what Superior Engineering had to offer and I decided to go 2 steps as the standard ratio was just a joke and unless in 4x4 low conditions the driving anround towns was a pain in the arse...... I spoke with the engineering company in Taren point who also agreed that if I went 1 step up and I didn,t like the improvement its an expensive gamble so went 2 steps and (for me) it was the right way to go.... but as my above reply to MB .... its just long distance drives across the outback where 4x4 high is typical the the larger size tyres make more sense just for fuel burn reasons ..... however closer to home I would not change the current gearing/tyre compination.

Brgds/Ian

Everything that MB said. The diff ratio that you have gone for i have not heard of before? What did they come in? going from 4.6s to 5.1s is about a 10% increase (About 2 ratios up). Common to go to 4.6s in TD42 to turn 35s and or 37s and the 4.6s out of the RD28 are well sort after.

Your 265s are about a 30.6" so called a 31" factory tyre.

Check this calculator for research

https://tiresize.com/tyre-size-calculator/

For your information to make the tyre size make sense this is how it is broken down.

265 (Width of the tread)
70 (Tyre Wall height as a % of the tread width - ie. 70% of 265 = 185.5mm wall height)
16. (Rim size)

I would expect you to turn 35s easily (315/70R16)