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Forgive my ignorance, I am new to this. What are 4.88s?
4.88's are the gear ratio of the new ring and pinion that will make your truck feel like a stump puller even with the big tires. It will keep your tranny from hunting for gears and restore fuel economy.

My buddy Julio has a supercharged tundra with 35's. He can burn the tires from a stand still and they stay lit up until he lets off the throttle. It wasn't that way before the new gears with the 35's.

I'm not saying that you should go around roasting the tires:lol5: But that is a side benefit of having the gear ratio correct.

With the bigger tires it's as if you're driving uphill everywhere you go, with 4.88's you're back on level ground. JustDiffs (on this site) sells Nitro gears. I have a set in my 1gen. They are the smoothest set of gears I've ever installed in my Tundra I've blown up the rear end in that truck 8 times from driving it like this:

 

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AH! Got ya! Should of know you were referring to gears lol. Wonder what that will do to my warranty?
it'll have no effect on your warranty. unless it was a problem with the differential, then the warranty would be whatever the manufacturer of the gears warranty is, Toyota would tell ya to pound sand. But with a 10.5 ring gear you won't have the issues that I've had with my 8" ring in my 1gen. These 2gens are much more stout trucks in pretty much every way possible.

Seeing your truck really makes me wanna lift my 2013 crew!!
 

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It is really close. The PD just has a little bit of a textured finish to it.




The gears and auburn are awesome. Brought my truck back to life! All my power is back!
it's so cool that you actually heard what I was saying about that. A lot of guys think that gears are a minor detail and just blow it off, especially with the hefty price tag.. The only thing that you can do that you will notice gear changes more is headers/full exhaust and supercharger:lol5: For the money gears is one of the best bangs for your buck.
 
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