OEM auto 3.91 swap to OEM manual 4.30 gears

This weekend, i am going to meet with a member and swap differentials. He has a 2022 TRD offroad 6spd manual with factory 4.30 gearing. I have a 21' TRD offroad 6spd auto with factory 3.91 gearing. He is re-gearing to 5.29s. I will swapping diffs for a few hundred bucks and he is using mine for cores. I will be on the stock 265/70r16s for a awhile until they wear down. I plan to upsize to 295/75r16s. I wanted to provide a little insight on this swap, track the RPM, and overall drivability (was it worth it).
Overdrive RPMs are as follows currently (in 100% stock form):
60mph: 1500rpms
65mph: 1630rpms
70mph: 1760rpms
RPM was recorded from scanguage II display.
Currently i average 22mpg on the highway and 19.9mpg on winter blend.
I do not see many people doing this swap so i want to document this as an option for others. I drive 80 miles a day and want to maintain a lower RPM so 5.29s and even 4.88s are a bit overkill for me.
According to a gearing calculator, final RPM with 4.30s and 295s will be identical to stock. This gearing will not overcome the additional need for the higher rolling resistance of 22lb heavier tires. I will update RPM/Mpg impacts as I progress.

 

*others with off-road models*

Which I know is like 95% of Tacoma owners or at least thats how it feels as an SR5 owner lol.

 

As an SR5 owner I was thinking the same thing. Gonna go see what ratios came in the SR5 4cyl models.

 

4.30, we can use those im pretty sure. I havent confirmed that personally though.

 

4cyl auto = 4.30 which I believe use the same diff as the SR5. Hmmmm.......

 

there are a lot of affordable options for other trims using the 8" rear end, not the 8.75." I did these on my first gen on 33s. I swapped the oem 4.10s for oem 4.56s from a wrecked truck (it was a 4cyl, auto, 4x4, as well).