Good luck bud, let us know how you make out. You will feel the biggest improvement with the gears.

Take care.

 

Well heres a long overdue update. I installed a Magnaflow replacement cat converter and the Banks cat back. Towing around to my local tracks I can get 13 MPG.

I still have the 3:73 gears and tow in third. I have been searching the boneyards for a 4:30 rear but have yet to locate one. That WILL be my next upgrade.

This past weekend I took a trip to London Dragway in London Kentucky. Overall trip netted 9.5 MPG average. Thats 1.5 MPG better than my trip to Missouri I took last year that started this thread. The ole Super Duty did pretty good for the first half of the trip. I could use cruise control and it would maintain 70 MPH up hills if not lose more than 5 MPH.

Once I got north of Knoxville on I-75 the truck did some strange things. Going up some of these grades through the mountains it felt like the brakes were applied while you were trying to accelerate. Even going down hill trying to accelerate the truck lost speed. You would hit the next grade and it would pull fine. I checked the truck over and over and all checks out fine. Though I did notice when it would lose speed my ears would pop. I haven't experienced anything like this before. Same thing happened on the way home back to Louisiana. Once I got south of Knoxville all problems went away and it pulled fine. Have any of you northern guys experienced this before?

 

I was just over in Knoxville hauling horses to Harriman(round the 40, 640 area) on Sunday and the only reason I would have the feeling of "brakes" is when tow/haul mode does it's thing up those 4% grades however, I noticed that you just have the locking out of overdrive and you don't have tow/haul so that eliminates that. Ears popping I just attributed to being up in the mountains as I feel that loaded or unloaded.