Wisdom and advice

I’ve got a 2013 Crewmax on 35’s and a 6inch lift. I bought the truck like this and I feel as if it’s very peppy and quick out of the gate. How can I find out if the previous owner re-geared the truck after the lift/tires if at all and, I’m wanting to go up to 37/12.50/20 soon and want to know what kind of shop re gears lifted vehicles and where I could buy them. I’ve read that 4:88 or 5:19’s are the way to go? Thanks in advance.

new member from Las Vegas.

 

No matter what, I'd go 5.29s...you will have zero regrets...what are your RPMs at 60mph (GPS 60mph)?

 

My rpms at that speed sit around 2,000. As it sits right now I can’t get her to go over 85ish MPH. I’ve never hit 90 but I’ve also never stomped the pedal. I’ve gradually held it and accelerated and she just won’t go over that speed.

 

Is the speedometer accurate? Does it go into 6th gear? And when?

 

2000rpm at what mph?

 

A supercharger will help to get up to 90 quicker. And a tune can remove the speed limiter to go over 90.