Whats your rev at @ 65 mph?

[JINO]

I have 37" tires, on the freeway, in 8th gear, it stays at 1600 rpm. Is that ideal or do I need to regear? Still on stock 3.73.

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[SamAbdul]

I have the older 5-spd. I have been getting ~2000rpms on 5th at 65mph
I'd wish to be you honestly.


it's normal buddy.

 

[Ratbert]

I have the older 5-spd. I have been getting ~2000rpms on 5th at 65mph
I'd wish to be you honestly.


it's normal buddy.

A 5 speed with the 3.0L diesel?

 

[Gorilla57]

My 3.0L Ram has 3.92 gears and 33” tall tires. I turn 2000rpm at 72mph. Never really looked at/remembered what RPM at 65mph. I’ll look the next time I run it down the interstate.

 

[AcesandEights]

Damn, I don't even have eight gears.

 

[Ratbert]

Damn, I don't even have eight gears.

You have a 3.0L diesel that doesn't have eight gears? Did you remove the transmission?

 

[Borderline Jeep]

I have a BS in Engineering. I have a spreadsheet where I can calculate RPM at 65 given tire size and gears? If you want me to send you some numbers please let me know.

 

[Borderline Jeep]

I also have dyno charts I made for the various engines vs rpm.

 

[AcesandEights]

You have a 3.0L diesel that doesn't have eight gears? Did you remove the transmission?

No, instead of removing the transmission, I added 0.6 liters and 4.88 gears.

 

[grimmjeeper]

I have 37" tires, on the freeway, in 8th gear, it stays at 1600 rpm. Is that ideal or do I need to regear? Still on stock 3.73.

1,600 is perfectly fine for a diesel.

Some people run 4.10 or 4.56 gears with 37s and are happy.

I have 3.73s and 37s and I find it to be a good combination.

Do you need to regear? No.

 

[Floriduramax3.0]

40's and 4.88's

 

[Ratbert]

I also have dyno charts I made for the various engines vs rpm.

Damn, that's some amazing low-end torque.

 

[Ratbert]

No, instead of removing the transmission, I added 0.6 liters and 4.88 gears.

This is the 3.0L EcoDiesel section of the forums.

 

[AcesandEights]

Then why do you keep asking me about my 3.6L?

 

[C.Sco]

I have 37" tires, on the freeway, in 8th gear, it stays at 1600 rpm. Is that ideal or do I need to regear? Still on stock 3.73.

It's fine.

I'm running 37's and also was around 1600-1700 at 65mph in 8th when I just checked this morning.

You can regear if you want but it's not really necessary with the 8-speed transmission and 37's.

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