Gears newb question

[07f150]

When I purchased my truck
It stated it had 3.73s on there well I now lifted my truck 4" and added 315s tires do I need bigger gears? If I do I was over hearing a conversation of something with the 4x4 and needing to swap out something in the front cause it wouldn't match up when in 4x4 does someone know ?
And what gear ratio do you recommend?

[2004XLT5.4LTritonV84X4]

I don't believe that you would have to switch out the rear end just with a lift......3:73 isn't super super high, so I would think you'd be ok. Don't go 100% off of my guess though, I'm not a Ford service tech or anything:)

[CountryF-150]

I think 3.73 will be just fine.

[bigred5.4l]

3.73 gear is fine, it's by far the mostly used ratio in rear ends, the only thing to worry about is your torque converter it could start slipping

[mhillgardner]

It all depends on what kind of service the truck will see. If you are just using it for a daily commuter you should be fine. If it doesn't have a tranny I would consider adding one. If you are going to to play in the mud and wheel it I would look at swapping out the diffs from 3.73 to 4.11 or 4.56 gears as it will be a hell of alot easier on your transfer case and axles under load.