Final drive ratio

[Kbidgood]

Has anyone changed their final drive gearing? I’m thinking about this but couldn’t find any info on it.

 

[TwizzleStix]

What’s your goal with a ratio change?

 

[Kbidgood]

My understanding from the car side of performance, aside from forced induction, gears are among the best bank for your buck mod.

 

[TwizzleStix]

Yes, gearing makes a huge difference in measured performance. My point is that you need not replace the ring/pinion gears for lower gearing. The best way on a the Gen2 like ours is to change the tire diameter. Using separate sets of tires, you can change the overall ratio for just about any task.

So, are you looking for better street acceleration & cornering or maybe to get back to the original overall ratio after installing the "bigger" tires that so many seem to want for "better" ground clearance?

Real Street Performance stuff= shorter, wider tires
Off-road or street-bragging= bigger (taller) tires and a ring/pinion swap(x2 for front/rear)

 

[BroncoAZ]

Stock is 4.10 ratio. If you went to a 37” tire The correct ratio to match stock would be 4.30, if you wanted a little lower than stock ratio for better acceleration then 4.56 gears would help turn the bigger tires. In reality with the 10 speed automatic trans there are enough ratios in the trans that a gear change for 37” tires shouldn’t make a huge difference unless it’s struggling to get going in first gear. If you had a non Raptor F-150 with 3.55 ratio and went to 37” tires then the gear change would make a more dramatic difference. Back in the day with a 3-4 speed automatic or manual trans the gear changes were more imperative to try and get your highway RPM in check, on these trucks the truck might decide to stay in 9th gear instead of 10th more often.

I don’t have the Raptor I ordered yet, but from what I understand the best performance mods would be a larger intercooler, a good tune, and CAI/exhaust. I think for many the engine performance is fine and they spend their mod money on suspension and lights like I plan on doing.

 

[TwizzleStix]

Yeah if considering increased performance/power, then an aftermarket tune for the ECU and TCM (engine and Trans) from Cobb or MPT is the most bang for the buck. In OTS tunes, the Cobb makes the most safe power plus there are several tuners that can get you more from the Cobb. There rest of the truck can stay completely OEM stock and you will LOVE it, on or off-road.