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Old 04-07-2011, 12:57 PM   #1
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Tires, Axles, gear Ratio.

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.

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Old 04-07-2011, 01:11 PM   #2
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4Lo.com :: Gear Ratio & Tire Size Chart
That chart will help you determine your gear ratio. Adding bigger tires will give you more ground clearance and more rubber on the ground, which equals more traction. With the added traction, you will add more stress not just to the axle shafts, but also to ball joints and steering components. Depending on what type of wheeling you do and your driving style, I would go with at least an 8.8 rear in your Jeep if you have a Dana 35 in there now. You can always get a set of Wagoneer Dana 44's or a 9" and HP44 out of a 77-79 Bronco or pickup. Both of these axles are a little wider (more stable) than your stock width axles. Of course you would need to buy new wheels for those axles. What type of wheeling do you do? What motor/tranny? Are you planning on changing the suspension? Is this a trail rig or daily driver?

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Old 04-07-2011, 01:13 PM   #3
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What engine and trans do you have? 37's are big tires, lots of $$$ to run them, bigger axles, streering brakes etc.. as for off road, will depend on the trail your on, are you running trails with jeep with 37's and not keeping up or can't go on the trail?
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Old 04-07-2011, 01:42 PM   #4
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Well my motor and tranny right now is the 2.5 liter engine and the AX-5 trans. Im going to get a new suspension....maybe a 5 inch lift kit from BDS? IDK yet. I use it for daily and i want to modify it for the trail. lol What is wheeling?
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Old 04-07-2011, 01:47 PM   #5
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Yeah and even with 33's the jeep can't keep up. I got the AMC 2.5 4 cylinder engine, and the ax-5 tranny. What engine would be best to run 37's? I can't go on the trail, i dont even have lockers. I want to modify it to lets say.....be good enough for the Rubi trail......somthing like that.
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Old 04-07-2011, 02:18 PM   #6
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35" tires can make it on the Rubicon. There are so many options out there it's not even funny. With the 4 cyl., you are probably going to want to gear as low as possible in the axles and a 4:1 kit in the transfer case wouldn't be a bad idea either. For the suspension, you could do a GOOD 4" SUA lift with 35"s and a little trimming or longer bump stops in a weekend to keep it as a daily driver. You could also do a SOA with stock or 1"-1.5" springs and fit 37"s easily, but it will probably take a couple of weekends to finish depending on your skills. For the axles, I would at least get an 8.8 in the rear with selectable lockers front and back to lessen the chance of breakage. I have the 9" and HP44 with ARB's and 5/13's in mine on 1.5" Rubicon Express springs and 37"s with the wheelbase stretched 4". I haven't done Rubicon yet, but I have done Fordyce, and it did well there. Maybe look into a cheap beater car so that you can take the time to build your Jeep the right way, it will save you headaches down the road. It took me about 4 weekends to finish mine, but it was worth it. I am not worried about breaking out on the trail with the ARB's, but I ONLY use them when I NEED them. You can go a lot of places open/open.
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Old 04-07-2011, 02:25 PM   #7
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Thanks for the advice.
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Old 04-08-2011, 12:41 AM   #8
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Without going too in-depth I'll tell you that it takes alot of money to run 37's. We're talking lift, rear and front axle swap, gears, SYE/driveshaft, and in your case a tranny swap. And that's all before you pay for the tires and wheels. Just be prepared.

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