I’m currently running LT305/70R16 with stock 3.55 gears. I don’t tow, or haul. Do I need bigger gears to run these tires? Thank you.

 

Sure wouldn't hurt. 4.10's would be just about perfect.

 

Someone said 4.11’s, but I’m glad someone who knows Dodges well told me better. What gear brands would you recommend, does Spicer/DANA make 4.10’s?

 

4.10s and 4.11s are essentially the same. Some folks just round differently than others.

Yukon makes some good gears, don't know who Dana sourced their gears from though. Even the USA gears are decent, just gotta be REAL careful with setup on those, else they whine.

 

Awesome! I prefer to go with the 4.10’s. I apologize if this is a painfully obvious question, however it’s an honest one; do I have to do my front differential as well?

 

If you want to use 4 wheel drive, they both MUST be the same gear ratio. Otherwise, it makes rude noises, and things stop working.

You are likely looking at 1600 bucks or more to do both axles...... Labor is the big thing here, as gear set-up is essentially an art form.