Gear ratios

50

Asked by TannerS0615 Oct 22, 2016 at 01:05 AM about the 2006 Dodge RAM 1500 Laramie Quad Cab LB 4WD

Question type: Car Customization

Im trying to determine the best overall gears for my
06 dodge ram 1500 laramie quad cab 4x4 5.7L
Hemi. I currently have 4" lift with 35x12.50r18 Toyo
Open country M/Ts. Its come time for me to
replace my pinion bearing because I can hear it
waring, but I was considering regearing the truck
while I'm there. I would want the front and rear axle
ratios to match up so I could run them together. I
currently get about 12mpg on average. Best fuel
mileage at 50mph (highest gear at lowest rpm), but
this is only because the 4 cylinder reduction eco
system never kicks in anymore due to the heavy
load. I hit it going downhill at times, but never
anymore. I'm burning up gas all the time running
these stock 3.92's. What would it take to get my
Eco mode back? But maintain power and speed
when I want. 4.10's be enough to get it the torque?
Or do I need to shoot for 4.56's? And if so, wouldnt
that be so high it would defeat the purpose of
reaching the 4 cylinder reduction mode? Also,
whats that mode called? MPS? Ive been told
before I have forgotten unfortunately. I appreciate
any helpful information.

6 Answers

50

And still being able to reach speeds of 80 mph confortably cruising! ^ If this is impossible, that's unfortunate. Just trying to find more than I know.

3 people found this helpful.
50

Thank you for your response! I appreciate the knowledge you have shared, which was helpful but not exactly what I was looking for. I am aware of how changing the differet ratios affects the mpg. However, what im trying to achieve is reaching the MDS mode. The truck doesnt have the torque to run the MDS mode with the current gears. Lowering the gears would only make the truck lug more and have more strain trying to accelerate and hold speed. I want to take some of the strain off, reduce the lugging to help maintain speed. When the truck isn't having to lug to keep up it will shift into MDS mode like I want. So I'm trying to increase the gear ratio, to reduce the strain on the motor, (increasing torque/rpm), therefore allowing the truck to reach its MDS mode. I'm trying not to kick a dead horse here, just doing my best to explain my theory.

1 people found this helpful.
50

Yes sir, thank you. The trick is, I'm trying to keep my setup and make magic happen pretty much. Keeping my setup, just modifying my gears to accommodate the torque instead of my tires.

50

I have not, but I have seen no sign of issue with it. I'll conult with my local dealer and see if they detect any problems or can help me. Thank you

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