it might be money better spent but my 4:10 pinion gear shaft was bad that is the intial reason I changed it but went to a more road gear. Picked up better mileage in 23 to 26 range depends if I can find fuel that doesn't have ethanol in it which is getting harder I use Lucas Fuel Additive and...
I have a 1997 6.5 always got 15 to 17 mpg till I changed out my gear ratio. I had 4:10 ratio in it before changed to a 3:73 and my fuel mieage jumped into the high 20's average around 26mpg at 65
How about your booster pump on the frame. My 97 has 2 fuel pumps one in the tank the other on the frame if not keeping up pressure it will die with no codes
On my 6.5 the module PMD that runs the pump other than putting it on a aluminum block with fins is there other ways to keep it cool in the summer months. I have a problem it is away from my engine but everything runs so hot that it still lunges when I slow down or stop after running in hot...
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