2014 Tacoma 2.7L 2x4 REGEAR

I recently put a lift on my truck and got bigger tires. Readylift 5Lug lift and went from Street 215/70/15 to A/T 32/11.5/15. It does fine city driving, but I've notice it struggling on the freeway. It'll rev high/drop a gear on slight inclines. I want to get it back to stock power, if not higher.

Currently stock geared at 3.83, I would like to change it to 4.10 or 4.56. I'm an novice when it comes to mechanical work, so I've read that it's recommended to have a shop do it.

Before I buy the parts need, I would like to verify that I'm picking up the proper parts.

It's a 2014 2wd 4cyl Tacoma. So I would need an 8.4 rear gear as well as a master install. Thinking about picking up a locker while I'm at it. Am I able to put a locker on a stock differential?

If anyone can verify that these are the correct parts or any other sources with better/cheaper prices, it would be very much appreciated.

http://eastcoastgearsupply.com/c-28...t100-8-4-tacoma-non-eld-ring-and-pinions.html

http://eastcoastgearsupply.com/i-126921-toyota-tacoma-t100rear-install-kit-master.html