My brother has a 03 HEMI Ram 1500 RCSB 2wd. He has 3.92 gears in it right now, but wants to swap in 4.56s. I think these are too low for daily driving, but he says that with his tire size (smaller than stock) he'll be at 2600 rpm at 75 mph.

What do you guys think?

 

What size tire is he running? There are tons of dakota guys using 4.56 gears with 27-28" tall tires and they work very well. Tho with 28" tires they are turning 2850 @ 75mph. With a ram he likely has at least 31" and be running between 25-2600 @ 75, not bad at all IMO.

 

I think its 255/55/18.

 

that won't be too bad

 

Thanks man. He ordered them, so we'll see how they do.

 

How do your trucks stack up now?

 

We've never actually lined them up, but when they were both stock and new I'd say they were pretty even. As he put more miles on it definately got stronger. With all my mods I'm faster than him now.

Now he has a Borla catback, Dynatech longtubes, and a K&N FIPK. Plus these gears and a HPP3 to correct his speedo on the way.

Sometime when TTPerformance has a dyno day we're going to strap them down and see how they stack up.

 

What an interesting test it would be to line them up now and again after the gear change.MY guess would be he would pull harder 0-70 and you would pull away harder than before after that.I am not a believer in 4:56 in light 2wheel drives.4x4 with 35" yes .The lower gears feel snappier but its a placebo effect when it comes to the 1/4 mile.


BTW
If you had a stall you'd be dialed

 

I agree 100%, seen it many times, good off the line but what you gain down low you will lose in the upper end of the 1/4, and it basically isn't an improvement at all, unless you like street racing from stop light to light.

 

Boy don't I know it. I just can't decide which to use.