does anyone have 4.10 or 4.56 gears in their trucks that could let me know what the rpm rest at highway speeds, 55 65 and 75?

 

4.10 will put you right back in the neighborhood of where it was with stock size tires. 4.56 will put you about 200 or so higher at about 65. If your drive is mostly NOT on the freeway, 4.56 will help quite a bit.

 

I had 4.56's in my jeep. About 2.2k at 65.

 

from what im reading 4.56 is as low as you can go without having to swap out carriers. although i see it is recommended. im reading going to 4.88 you must swap carriers on the front axle.

 

I think 3.92 or some such is the break point for the front carrier. The trick, just buy thick-cut gears, and you can re-use your stock carrier. Unless you want to go to selectable locker? To pay someone else to regear both ends of your truck, you are lookin' at around 1600 bucks..... (a nice selectable locker runs another 3 to 4 hundred. Hint, hint.)

 

thick cut gears, only for the front right? i may go locker, ive got some time before i do this regearing so ill ponder it all many times, change my mind more than a few times. my uncle has all the tools and knowledge to do the job so ill get to learn and help him when the time comes.

 

Not having to fork out huge piles of cash for labor certainly makes the project more appealing.

No need for thick cut in the rear. The dodge rear end will take whatever gear ratio you care to stuff into it. (up to 4.88, I think, but, no reason to go that deep)

 

Yeah, all of the cost of re-gearing is in the labor to properly set them up. Good to go...