Looking for Re Gearing advice
#1
Member
Thread Starter
Looking for Re Gearing advice
I'm trying to figure out if I should re gear my truck. I have a 2010 F150 Lariat 4x4. Stock tires were 275/55/20 and I recently put 33" cooper STT tires on. My gas mileage dropped to 13 around town, maybe 13.5 or a little better on the highway. RPM's are about ~1800 at 70mph.
I am having a hard time finding information about re gearing. I would love to get a little bit of my power back, but would also love to get better gas mileage. I'm not sure if that is possible at all. I'm thinking my stock gears are 3.73, would it be better to go up (say to 4.10) or to go down?
Can someone explain the what would happen if I went down, or if I went up? I know you can re gear to get better power, but can I re gear and get better fuel economy? Would it be worth it? Thanks for any advice you can give me!!!
I am having a hard time finding information about re gearing. I would love to get a little bit of my power back, but would also love to get better gas mileage. I'm not sure if that is possible at all. I'm thinking my stock gears are 3.73, would it be better to go up (say to 4.10) or to go down?
Can someone explain the what would happen if I went down, or if I went up? I know you can re gear to get better power, but can I re gear and get better fuel economy? Would it be worth it? Thanks for any advice you can give me!!!
#2
Senior Member
iTrader: (3)
Long story short, no it is not worth it. You will be looking at around $1,000/differential. Since you have a 4x4 you will have to replace the gears in the front and rear diff. You have poor gas mileage now because of your bigger tires, the minimal savings in mileage that you "might" get from re-gearing are not worth the expense it cost to re-gear, besides re-gearing is typically to recoup power not gas mileage. A tune might be in your future tho, it will get you some power back, re-calibrate your speedometer and you might get a mile or two per gallon back.
#3
Member
Thread Starter
Long story short, no it is not worth it. You will be looking at around $1,000/differential. Since you have a 4x4 you will have to replace the gears in the front and rear diff. You have poor gas mileage now because of your bigger tires, the minimal savings in mileage that you "might" get from re-gearing are not worth the expense it cost to re-gear, besides re-gearing is typically to recoup power not gas mileage. A tune might be in your future tho, it will get you some power back, re-calibrate your speedometer and you might get a mile or two per gallon back.
#4
Senior Member
you only went up about 1" with the Coopers. the weight and tread pattern on that tire is what is causing the lost mpg. not much you can do, i doubt a programmer will do very much.
#6
Member
Thread Starter
Yea I'm not sure I want to drop $500+ on a programmer to not get results to make it worth it anyway. Gonna put a cold air intake and exhaust on in the future, so maybe I'll see some sort of increase on my mpg's
#7
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Thread Starter
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#8
Senior Member
Your 32"s went to 33"s, ~3% bigger.
Going from your stock 3.73s to 4.10s is ~10% lower.
Going from your stock 3.73s to 4.10s is ~10% lower.