anyone with 4.56 gears.

Curious what kind of mpg are you guys getting with 4.56s. Rpms on the highway? When I get back from deployment in a couple months I'm looking at putting them in. thanks fellas!

I have 4.56 gears....with 35s and the torque and gas mpgs are fanominal. But on the high way I wish I had an extra gear. Cause I run about 2300rpm at 70 or 75.

If I do an actual 60-65 mph (which I don't) it's about the same as stock 3.92's, especially using the cruise control. Above that, gets abysmal quick lol.

Bad after 65 for me now on a 29" tire. But this isn't my highway warrior vehicle.

Does suck doing 80mph at like 2700-2800 rpm.

2014 Ram 2500 gear change

Hi All. This fall I had the gears replaced in my 2014 Ram 2500 Big Horn Crew 4x4. The stock gear was a 3.73 and I had the 4.56 installed. WOW, what a difference. With running the stock 6.4 hemi, the power and performance characteristics are great. All I had hoped for. As for rpm's in 6th gear, went from 1800 rpm at 80mph to 2300 rpm at 80. Guess I could say, I took off the top gear and put in on the bottom. I now own a "truck". I purchased it for towing a 27', 13 plus k tow hauler. With the 3.73's, it would pull the trailer with the stock gearing but had to run well (4500 to 6000) rpm range to pull up 10% grades at higher elevations. Pulling something close to rated towing capacity isn't the problem if you want to keep rev's up. Would pull at 60 up a 10% grade, but that is in 1st gear. Lets just say, if you were lucky, or "unlucky" enough to get it to shift into second or especially 3rd, "Watch Out"!!.If you , after the upshift, get anywhere near 1/2 throttle to hold the speed, it will downshift in a blink of an eye. Lets just say, had it happen only once, thankfully, it shifted at about 50mph from 3rd gear to 1st gear. Let me tell you that it will turn the tires on a downshift like that. Pulled so hard that it snapped numerous #10 screws in the front body panel of the trailer. Will make your "blood run cold". As for mileage, in the upper elevations of CO., was getting less than 8 mpg and in the eastern part of SD on the flats, about 2000 ft. elevation, barely got 8. That's still running in 3rd and 4th gear continuously. NOW, with the 4.56 gear, towing in high steep elevations in CO, am getting about 10 mpg and suspect in lower, flatter elevation should be somewhere in the 12's.
as for pulling gears, now 4th and 5th easily and running high 2's to mid 3's in rpm most of the time. Empty except for 300# slider hitch and 250# generator, get about 15 mpg in town, 15 to 16 on hi way. Last trip to Denver from the west side, running 70mph plus, averaged 15.5. Didn't think that was too bad. All in all, the best money I ever spent. Love the Truck.

4.56's with stock height 32" tires I am at 2300-2350 at 70 mph, and even with cam, heads, gears and stall I get right at 17-20 on the highway . This is with a Qcsb 2wd. Does just fine in my opinion as long as you stay with stock size tires or bigger.

running 35's with 6" lift. Just installed my 4.56's. I recommend doing the diff also, as the stock is know to fail (as mine was). I went with the Auburn. Doing 70 mph, I sit at just over 2000 rpm. just over 21 at 75. My last trip I averaged around 15 mpg at 70 mph. In the city, I average 13 mpg. I'm thinking of going with 37" tires next to help with mpg gains, but with the 35's it feels like I have some good trq.

The stock lsd's afr nice units, don't replace unless it goes out