'11 5.0: RPMs w/4.56 gears and 35in tires?
09-11-2013, 07:26 PM
#11
Interested if anyone else can chime in on this who has done 4.56s?
From my research, 4.56 is the way to go to make up for the tire size (35's) as well as the weight of the heavier tires, as opposed to going with 4.10's.
From my research, 4.56 is the way to go to make up for the tire size (35's) as well as the weight of the heavier tires, as opposed to going with 4.10's.
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rdkev (09-12-2013)
09-11-2013, 08:15 PM
#13
Senior Member
No no no! First, changing gears will not bring you back to stock mpg with bigger tires, there's so many other factors in play so it just won't happen. Second, the axle was changed in 2011 so as far as anyone on here knows, 4.56 gears are not available for our trucks. Third, changing gears in this truck is going to be more expensive than most others, let us know how you do.
09-11-2013, 09:30 PM
#14
One Bad MoFoMoCo Owner
I can tell you that with stock 32" tires, and 3.55 gears, there's plenty of power and mileage is great.
You're not going to get your mileage back from regearing, so forget that notion. Some report good results from a tune, CAI combo, without regearing.
However, the acceleration should feel about the same if you have 3.73 gears, and 4.10 gears should be better than stock. A tune that adjusts for the tire size, and changes the shift points could make those adjustments as well.
While I'm not a big fan of tuning, that may be a better option for you.
You're not going to get your mileage back from regearing, so forget that notion. Some report good results from a tune, CAI combo, without regearing.
However, the acceleration should feel about the same if you have 3.73 gears, and 4.10 gears should be better than stock. A tune that adjusts for the tire size, and changes the shift points could make those adjustments as well.
While I'm not a big fan of tuning, that may be a better option for you.
09-13-2013, 10:50 AM
#19
So it is. I thought that they made them for the 9.75" rear ends. Well I wish they had 4.30's available. I put in 4.56's with 35x13.50 tires with a 5.4. Although it is great for towing, for regular driving the power curve kinda plateaus a little too quickly. Even with the Evo. I would say if you don't plan on pulling anything heavy very often, go with the 4.11's.
09-13-2013, 11:42 AM
#20
So it is. I thought that they made them for the 9.75" rear ends. Well I wish they had 4.30's available. I put in 4.56's with 35x13.50 tires with a 5.4. Although it is great for towing, for regular driving the power curve kinda plateaus a little too quickly. Even with the Evo. I would say if you don't plan on pulling anything heavy very often, go with the 4.11's.