I have been chaseing my tail with this! i have a 2002 ram 1500 360 5.9....4inch lift 35s. if i am at highway speed and hit a slight hill, i start to lose speed so i press the gas to speed up but nothing happends till i press the gas far enough for it to kick down! i did a back pressure test it read a 0 , no vacuum leaks,trans is just fine acording to the trans shop here!
ive replaced TPS map sensor, and plugs .wires.....no codes i need sum advice! my gas milage is 1-3 in city 6-10 highway HELLPPPPPPP!!!!!!


THANX

 

RESet my pcm and pcv valve to!

 

Those 35s have killed your torque. The 360 is a gas hog anyway. Have you cleaned the TB? A Sea Foam dose may help, but you've lost so much torque with the over-size tires, that's the most likely culprit.

EDIT: Your mileage is actually better than you think it is - your odometer is severely off, too.

 

I have only one word for you GEARS! Dodge and other companies have been forced to gear these trucks to get as good as they can on fuel mileage as a result they have no torque or HP at the RPMs we are turning at highway speeds. I live in PA and drive mostly 2 lane 55 MPH roads with my 01 RC SB and the 5.2 is useless in OD even with stock tires. When I start it up I turn the OD off before I move it and only turn it on if I am over 60 MPH and flat.

 

While I agree that 4.56 gears are a must, especially with a 4.7 or (1960s vintage) 5.9, I'm thinking Plenum Gasket has failed and he's getting blow-by out the a$$ for those kinda symptoms...

 

Sounds uncomfortable.

 

hammer is on it, take off that airhat and look down your tb, and see if you have oil pooled up, a small amount is normal, pooled is a problem. hows the maintenance been on the motor?

 

i dont beat on the truck....i do schedual maintenance if theres a problem im on top of it! lol ive been dreading the plenum! ive got a hissing sound every once in awhile! ive replaced the iac. the oversized wheels srry man.....its not that the truck used to run just fine! i had acouple vacuum probs fixed those and this prob occured!