RPM question while driving

[Thumper580]

Just put a new tach in my M998. It has the 6.2L with the 3 speed. At 55mph it's turning about 2700/2800 rpm. Does that seem pretty normal? Just curious. Thanks.

 

[LouWon]

Seems normal, I run Nitto's 38" tires on mine, so I might be a bit off, I do go to 70 at 3400 for a short time, but mostly 65 at around 3200
6.2L with the 3 speed

Max Engine Speed:	3,600 rpm (4,000 w/ no load)
Peak Horsepower:	• 130 HP @ 3,600 rpm (introductory) • 160 HP @ 3,600 rpm (peak)

 

[Thumper580]

Seems normal, I run Nitto's 38" tires on mine, so I might be a bit off, I do go to 70 at 3400 for a short time, but mostly 65 at around 3200
6.2L with the 3 speed

Max Engine Speed:	3,600 rpm (4,000 w/ no load)
Peak Horsepower:	• 130 HP @ 3,600 rpm (introductory) • 160 HP @ 3,600 rpm (peak)

LouWon, 70 with the 6.2L? WOW..... I have 37" Yokohama tires in mine. Thanks.

 

[diesel dave]

Mines 2000@40,2500@50,3000@60. So yes

 

[kzeyus]

Sounds very similar to mine

 

[Action]

I get 2000 rpm @ 50 mph, 2700 rpm @ 70 mph with 6.5 TD, 4l80e, 3.08 diffs, and 37” tires. On flat roads.

 

[LouWon]

I downloaded the speedometer app (GPS) on my IPhone, it's free and more accurate than the oem speedometer.
This way you can figure the speed Vs Tach

 

[Recovry4x4]

Use this to determine exactly what your RPMs are. Gear Ratio Calculator (grimmjeeper.com)