Dodge Ram 3500 G56 

Mine was the same I have 3.73's. I run 35s now and run 78 at 2300rpm.

Needs a re-gear. 3.73 is a sweet spot i think. A 4.10 is good for hauling freight trains and going fast real quick. You could also try bigger tires

My nv5600 with 3.55 gears runs 2,000 rpm at 70mph. It’s a one ton dually and I haven’t had an issue starting in 1st pulling 20,000lbs

if that's an 06 the tach is definitely off. mine goes from reading to not working at all depending on the day. you're fine.

I bet that truck can pull a mountain tho! 😅

Need bigger tires or smaller gears

Pretty sure it's gearing. (4.10 maybe) Mine does the same. No biggie for me though, I don't travel highways, all country roads. It's geard to haul heavy. (1st/low does what 5 to 10?)

Doesn’t sound like it’s at 3k rpm’s but you need different gears bro. I’m at 70 in 6th at 21-2200rpms

i'd say based off listening to it it's at like 2100, not 3000. check ur tach

They made 2 different over drive ratios in this g56 depending on the year you have but I think it’s safe to say you have the lower geared g56

I run 33 talls on mine and at 2200 rpms i hit 70 i didnt care for the 35 wide ass tire simply because it made getting into tight parking lots a nightmare plus i like the way the 33 talls handle when towing

Depends on year of truck cuz the g56 has 2 versions

Clean interior bubba 🎉

Idk whether that’s a 5.9 or a 6.7 Cummins but my 6.7 with a g56 runs about 2,200 rpms doing 70.

Tach is def off my 4:10 truck is not that high at 70 check if you have the window sticker it’ll say what gearing it has

I had the same problem but mines auto I just rode it for like a month and now it’s back to normal

what’s your gearing?

It's geared to tow not cruise, that's what's happening

If it’s an 06 the tach is probably wonky. Either that or you have an Early G56. 6th gear sucked in the early models

you have an early model G56 and 6th gear is geared way too short. you can get a conversion kit to make it longer if you don't want to change your tire size.

AD ratio trans and 4.10s probably. Get bigger tires.

tachometer is wrong

I have had the same problem with my 03 3500

well the trucks meant for towing/ heavy loads

4.88 rear end gears

Diff ratio need to be changed

I have a 2500 6.7 g56 and have 3.55 and I'm running 2200 ish at 75

Re gear or maybe bigger tires??

It's just your needle is off lol my tricks do that. Too. I'm sure your rpms aren't actually reading that

I have 4:10 in mine it’s a auto but at 75mph I’m redlineing

I have a 4th gen and was able todo 135 in 6th without hitting redline

Bigger wheels and tires

You gotta get a gear vendors. It’s an auxiliary transmission that goes on the back of your transfer case and should drop the rpm’s down too around 2300rpms

Mines got 410 and it’s not that slow your clutch must be slipping or something

What gears ? 3500 usually a 373

Is the clutch slipping? How many miles on the clutch? I have replaced the clutch twice in 60,000 miles, and I baby it! These clutches aren’t designed for heavy use even though in a truck. Easily damaged by vibration in the drivetrain.

i have an 06 4x4 w a g56 on 37s and my truck will do 120

Its a 2006.. the tach is the problem

4.10 in the rear end

A little thing called GEARS... You most likely have 4.10s

You prob have the early G56 trans. Terrible OD gear

I’m at 2100 at 60 with 35’s pretty sure I have 4:10

Normal

Your diff gear is to low. That truck is a great pull truck but not highway truck. 3.73 needed

It’s called get better gears

You need more tire

You probably have 4:10 gears

Regear to 373 or 355 or bigger tires. I have 35s and 355 gears

It's a truck meant for pulling so it's geared low.... If you're wanting good gas mileage when you're not pulling a trailer, get a car!

For driving a manual you really don’t know your truck that doesn’t even sound like it’s struggling

You have 4.10s

U got a bad clutch 3000 rpms are too high g56 in 6 gear goin 70 should be 2200 rpms

Run bigger tires

Not everything is a race car

4:56?

The trammy was built for a gas engine.

Are you in 4th 😂

Someone re greared that truck

Ur gauge is fucked up. There is a video on how to fix it on here.

To small of tire

Because it's a dodge😂

I am running at 2k 110mph 😑😂

Ohh yeah ill tell you how to solve that get fid of your Cummins lol