Originally Posted by vismark
Im new to these forums. I just want to hear some advice from others. I own a 92 Jeep yj with a 4 inch lift and 33 inch tires. I really want to get 37's on my baby, but I just want to know-are bigger tires necesserly better for off roading? And what type of axle would I have to buy to roll on 37's with lockers (because I heard lockers put stress on axles)? What gear ratio is best? And what about 35's? (Same Question) Thanks.
First off welcome to the forum.
Off roading is all about what you want to do with your vehicle. But to answer your question quickly a big lift and big tires do not necessarily make better off roading. Many times people hurt themselves.
Ground clearance is very, very important in offroading. This does not always mean bigger tires or lift. Most lifts required a t-case drop...that hurts your ground clearance. Using combinations of body lifts and suspension lifts you keep your center of gravity lower and still have more ground clearance.
I would recommend a dana 44 front and rear axle for 37's. The dana 35 is a weaker rearend. The dana 30 up front will hold up but again driving technique and terrain makes opinions on parts vary. A 44 in the back and some work to the front would be ok. Dana 30's are plentiful.
Now lockers....yes you need them. No debate. If you want to offroad, lockers are a very nice thing to have. Can you run without...yes... but get you'll know when you don't have them. ARB is awesome but expensive. Aussies work great up front....hard to drive in snow. That is what is going under my cj next weekend.
Gears. Again...you need them. I hope your Jeep is regeared from stock now w/ 33's but may not be. Recommendations vary but 4.10 or higher is needed for 33's...4.56 is a good gear. Now 35's to 37's...you need 4.88 or 5.13. It may sound like you are gearing way down but in fact you are just trying to return the vehicle to stock settings so you can crawl and drive it like a jeep.
Hope this helps. I have a cj7 I am in the middle of redoing. I removed my 4" Rough Country Lift. Installing a 2.5" OME lift and 1" body lift. Changing my axles from 3.54/open to 4.10/locked. I am running a lunch box locker front and back....not gonna be nice on the pavement. So I understand your questions.