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The 5.4L 3V is a dandy monster torque at low rpm engine. It grunts like a champion and is why Ford hauls better than most during those times. The 3.55 gears paired with 35s will work just fine, as I got away with it for a while. I wanted more performance so I went with 4.56 gears on both diffs and the truck is a whole new machine since. The smaller V8 is not the same. I can't imagine how your gas mileage is hurting with those 35s. The driveline will be taxed, but I firmly believe you won't damage your tranny so the sky is it falling. I think you have to ask yourself if you want better performance and better economy and then make the financial commitment to make that happen.
A lot of people make that commitment for bigger wheels and lift kits, but don't want to invest in gears and tuning. Then they turn into adamant advocates of "oh you don't need all that -you'll be just fine". I should know because I was one of those people and I would preach from the hilltops on this board about it. After my 4.56 gears and the tune, let's just say I have changed my tune. Single best thing I did for the enjoyment of driving my truck was adding gears and the tune.
My .02.
__________________ 325/65/18 Toyo Open Country ATs * 18X9 XD Series Cranks * Rough Country 2.5" Level Kit * 40-Series Flowmaster SIDO with chrome duals * 4.56 Yukon gears on both diffs * SCT X3 programmer with custom tunes from Mike at 5star (87perf, 87econo, 93perf) * S&B CAI * EBC 6000/7000 brakes and rotors
How is that SCT tuner? I want a tuner but worried about all of the possible issues that people talk about such as overheating, transmission issues, etc?
I have the SCT X3 with customs tunes from Mike at 5 star. PM me and I will tell you all about it. Unbelievable performance gains... Mike can create safe power gains that will make you never want to trade your truck in for something newer.
__________________ 325/65/18 Toyo Open Country ATs * 18X9 XD Series Cranks * Rough Country 2.5" Level Kit * 40-Series Flowmaster SIDO with chrome duals * 4.56 Yukon gears on both diffs * SCT X3 programmer with custom tunes from Mike at 5star (87perf, 87econo, 93perf) * S&B CAI * EBC 6000/7000 brakes and rotors
The Following User Says Thank You to OkaloosaFX4 For This Useful Post:
Anyone running a 99-03 4.6L 2wd with 3.55s and 285/70/17?
I've got am 07 with that setup...and it is pretty slow to take off from a dead stop
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07 XLT SCrew, 3/1 Level, 17" Vision Warrior Wheels, 33" x 11" Rocky Mtn AT/S, Gotts, DIY Thrush Side-Exit Exhaust.
Next on the list is Black-out headlights, 4.10/4.30 Gears, E-fans, Under cab Turbo!
It's capable, but a little slow. I live on the plains of west Texas, so hills are nonexistent. It tows fine on the highway under 70mph. That said, I am planning some 4.10 or 4.30 gears this winter to get a little pep back. The most I've pulled is about 6500 pounds and I've had well over a ton in the bed. It's a good solid truck with enough power for most applications without the engine problems that can come from the 5.4.
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07 XLT SCrew, 3/1 Level, 17" Vision Warrior Wheels, 33" x 11" Rocky Mtn AT/S, Gotts, DIY Thrush Side-Exit Exhaust.
Next on the list is Black-out headlights, 4.10/4.30 Gears, E-fans, Under cab Turbo!
Go 4.10. The difference between a 3.73 and 3.55 with a 4.6L is going to be far from earth shattering. If you're going to regear it- 3.73 is almost moving laterally.
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2010 Screw 4x4 5.4L, Rancho Quicklift, Rancho 9000XL shocks on the corners, Procomp AAL, MBRP SI/DOS exhaust, Kenwood noise maker, and CHROME
325/65/18 Toyo Open Country ATs * 18X9 XD Series Cranks * Rough Country 2.5" Level Kit * 40-Series Flowmaster SIDO with chrome duals * 4.56 Yukon gears on both diffs * SCT X3 programmer with custom tunes from Mike at 5star (87perf, 87econo, 93perf) * S&B CAI * EBC 6000/7000 brakes and rotors
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