I have a 2004 F350 V10 with 3:73 gear ratio, stock tires on 17" wheels. Daily I tow an enclosed trailer that weighs 4000 lbs Loaded. Also a boat that weighs 4500 lbs. I tow 200 miles from Massachusetts to Maine often and my gas mileage averages around 7.5 MPG at 70 MPH. I have been told a few times that I should change my gear ratio but I am also concerned with local and non-towing MPG. I am looking for recommendation on what gear ratio I should be running but would also like you to consider the following. I would like to add a small lift of possibly 2-3" and 33 to 35" tires.
Thanks for any help!
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2004 F-350 FX4 V10 Lariat SuperCab Torreador Red and Arizona Beige, Painted Lund Bug Deflector, Sun Visor, Side Window Cover, Side Window Visor, Taillight Covers and Rear Window Visor. Tilt-up Tonneau Cover. Ford Underrail Bed Liner w/ 1/2" Rubber Mat.(No Slippage) Stainless Billet Grill
If your sole purpose is better milage I would slow down to 65mph and it will make a much bigger difference. The truck should tote that small load just fine, now if you add a lift and larger tires you are further killing your milage and then a move to 4:10's will be in your future. Try slowing down, keep rpm's below 2000 and I think you should see 10-12 mpg. I get 9-10 towing the trailer in my sig, and I have a dually with 4:10's!!
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2000 Ford F350 4X4 Auto,Crew Cab Lariat, Western Hauler Package, Long bed,
Isspro EV Guages on A-Pillar, Coolant change from Green to Gold to Red,
SCT XCalibrator2 with DP's 60 tow,80 econo,120 Race
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Towing a 2005 HORNET 30BHSS 8500 LBS,
Stopping it with a Prodigy P3 Controller
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Your gear ratio is fine, go down you'll gain acceleration, but lose highway mileage. Go up and you'll get the opposite effect. If mileage is your concern, get a diesel. I'm on 37's and still runnung stock 3.73 gears. I've never been able to make the mileage better, worse, no problem, but I didn't expect an 7500lb truck to sip fuel either. It's still way better than the gas truck it replaced. Good luck, Bart [img]/ubbthreads/images/graemlins/tongue.gif[/img]
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01 CC SB 4x4, 4 bank DI chip, Garrett GTP38R, Gutted EBP valve, AFE Stage 2 intake, Pillar gauges, built trans w/billet converter,Hx crossover pipe, Shimmed fuel pressure reg. Bullydog propane injection, 4" side piped exhaust -due to interference with Fox res. shocks, cowl induction hood, Custom mesh grille, 03 lites, Line-X, 8" Donahoe lift with remote res. Fox shocks, ProComp Xtreme A/T 37's on 10" Centerline Vectors, XM, Retrax bed cover, A.R.T. rotors and Performance Friction pads on all 4 corners, Elf 15/40 full synthetic oil, AIH delete, Aluminum deep finned trans oil pan -full of Redline Synthetic ATF, Mag-hytec rear diff cover, Lighted heated TT mirrors, Sunroof with custom alcantera headliner, Custom leather wrapped steering wheel, roof dynamated, 4.56 gears-LSD front & Rear. Train horns.
With the 3.73 and the stock tire size, the weight your pulling, you are just fine.
If you go to 35" tires, to get back to the stock gearing, you would need to put in 4.30 gears.
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2012 F350 XLT 6.2 4X4 CC 4.30 with 285's, Bakflip cover with Rhino Bedliner so far.
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Try slowing down, keep rpm's below 2000 and I think you should see 10-12 mpg. I get 9-10 towing the trailer in my sig, and I have a dually with 4:10's!!
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You have a Diesel....different animal. Personally our V10 has 4.30's and stock tires and we almost always get around 10 pulling closer to 6K in and enclosed trailer. And we are no where near 2000 rpm. I think that the V10 needs to be revved to get it in the sweet spot. I think half the reason there are so many V10's reporting poor mileage is because the are lugging the motor with slower speeds and higher gears.
Trinity
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Early 99 6spd (Eaton Fuller Knob), 285x75 MTR's, DI 4 POS Chip, Walker BTM, listening to XM Delphi skyfi, pulling 24 ft full of Mechanical Bull, heading to a bar near you! Truck pics
Im in a different catagory than most as i drive a 99 150 with the 5.4.
I did put 2 new ready to run heads on due to cyl3 blowing a plug at 197K but.. now with 208K i swapped out the factory mass air, throttle body ( just did not feel like cleaning. it was crusty man) and a tb spacer. it already has an air force 1 intake on it. no muffler.
i added an edge programmer. stage 3 tune ( performance and towing tune) and then adjusted the gear ratio and tire size. ( 285 70 17 )mud terr. cooper stt's. well after adding the edge ( which is very cool in itself with all the info it gives. normally at 75 on the interstate i would run 2250/2300 now it runs 1750 or so.. BIG difference in mileage. not sure what the programer did. some how locked the TQconv in better? anyway.. this helped me. last highway tank i got was 18.8mpg
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