6 speed manual gears overdrive

Hi all,
trying to find out if this is possible...
have contacted local and national Toyota contacts with no success.

2009 6speed manual.
I just went from the stock 3.73s to 4.30s.
285/70/17s
2nd gen 6th gear is .849
3rd gen 6th gear is .713

100kph(62mph) with 3.73s in 6th is 2050rpm
100kph(62mph) with 4.30 in 6th is 2400rpm

My question is;
does anyone know if one can swap the .713 gear from a 3rd gen into a second gen?
I've talked to Toyota and they can't answer the question. I'm looking to get whatever pertinent information about thickness/diameter/whatever is relevant to this to be able to help a gear shop figure out if this is possible. Supposedly, the transmission doesn't even need to be dropped, just the transfer case; supposedly.
Anyone know the answers about this? Or, can anyone put me in to right direction?
I'd like to get my rpms down a bit for the highway.

Thanks,
Barrett

 

Boy, have I got a thread for you.

https://www.tacomaworld.com/threads/6-speed-shenanigans-ra60f-swap-to-rc62f.701237/#post-24849044

 

You can also swap in the FJ cruiser's 6th gear from their RA60 it has a slightly better overdrive ratio.

AFAIK the RA62 uses different shafts from the RA60 and thus the gears won't fit.

So you can be the 2nd person to swap a RA62 into their truck or go thr FJ/t56 route.

If 4x4 and you go t56 you will need a divorced atlas case and custom drive shafts.

$$$$

 

has anybody done this

I know it's a thing in the Audi and possibly VW world



https://shop.efi-motorsport.com/products/01e-diesel-6th-gear-set-56

different trans same idea 5th gear swap

https://www.pirate4x4.com/threads/t...r151-r452-dyna-5th-gear-swap.2000978/#replies