I have a 1999 4x4 1500 with a 5.9. It is lifted 5" suspension, and 2" body lift.It has 35" tires also. I have put a cool air intake and a throttle boddy spacer on. My question is how can I get more power and better gas milage. I am getting 10 miles to the gallon right now. I dont want to sell it but I do a ton of driving.

 

Well if you are going to keep the 35's about the only thing that is going to help your mileage is a gear change. Other than a gear change, replacing the 35's with something smaller is about the only way to improve your gas mileage.

 

Thanks. I do plan on keeping my 35's. What gears do you suggest , this is kinda new to me. How will that affect speed? Thank You.

 

The throttle body spacer actually does nothing but look pretty with these engines. It is designed to mix the fuel and air by creating a wind vortex in the intake manifold. However, in our multi-port fuel injected engines, the fuel is not mixed with the air until the air passes through the intake manifold runners and is just about into the cylinder.

The barrel intake manifolds of our Magnum engines receives it's air through the throttle body. It then enters the manifold runner (there are 8 manifold air runners - one for each cylinder) and the air passes around the top of the barrel manifold and is then mixed with the fuel at the injector just before entering the combustion chamber. All of the vortex action from the throttle body spacer has been lost during the airs travel to the injector. In actuality, the air does travel about a foot between the throttle body and the injector.

In order to help yourself out you also need to improve the exhaust to match the air output more to the air input. The engine will only pull in as much air as it can expel through the exhaust system. Headers, high-flow catalytic converter, and cat-back exhaust system will open that end up. A Fastman ($250) 52mm throttle body will complete the opening of your air intake.

Good luck.