4.10 Gears??
JK Junkie
Joined: Jul 2008
Posts: 3,017
Likes: 0
From: Lakewood, OH
ya i have been around here long enough (and in cars in general) to know the way Jeepers think. I am def in the minority around here in my gearing thoughts, but thats why I post and belong to forums. To give people a different view on things compared to the flood of the 80% opinion.. Not everyone wants extreme, a lot of people have daily drivers. With my 32" tires I stay in 5th on freeway unless I have complete flats, then i enjoy popping it into 6th which can easily hold 80mph no problem. When my tires run out I will probably go 33" with no lift just cuz I can. But I still wouldnt plan on touching my gearing..
With a JK it's quite different as you don't have an abundance of power. You also have an engine that starts making power at a relatively high rpm. For cruising speeds and efficiency you want to be operating at 90% of peak torque which for the JK means around 2300 rpm. Once there you enable the throttle body to control negative manifold pressure and supply on demand power. if you run at lower rpm you are more reliant on things such as downshifts and unlocking the converter to get more power which is extremely inefficient when you don't have a lot of power to begin with.
Don't be afraid to twist the motor a bit as the percentage of increase in rpm doesn't equate to an equal percentage amount of fuel being consumed.
JK Freak
Joined: Mar 2010
Posts: 623
Likes: 0
From: SF Bay, CA
My knowledge of appropriate gearing comes from the other side of the fence in drag racing where the prescription is under gear and over convert. Lots of power and getting it to run consistently is the order of the day.
With a JK it's quite different as you don't have an abundance of power. You also have an engine that starts making power at a relatively high rpm. For cruising speeds and efficiency you want to be operating at 90% of peak torque which for the JK means around 2300 rpm. Once there you enable the throttle body to control negative manifold pressure and supply on demand power. if you run at lower rpm you are more reliant on things such as downshifts and unlocking the converter to get more power which is extremely inefficient when you don't have a lot of power to begin with.
Don't be afraid to twist the motor a bit as the percentage of increase in rpm doesn't equate to an equal percentage amount of fuel being consumed.
With a JK it's quite different as you don't have an abundance of power. You also have an engine that starts making power at a relatively high rpm. For cruising speeds and efficiency you want to be operating at 90% of peak torque which for the JK means around 2300 rpm. Once there you enable the throttle body to control negative manifold pressure and supply on demand power. if you run at lower rpm you are more reliant on things such as downshifts and unlocking the converter to get more power which is extremely inefficient when you don't have a lot of power to begin with.
Don't be afraid to twist the motor a bit as the percentage of increase in rpm doesn't equate to an equal percentage amount of fuel being consumed.