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)