Postby OldGreen » Tue Oct 08, 2013 3:03 pm
Let's clear a couple of things up:
1. JK owners, as a group, typically don't have a horse in their own race. . .to use your analogy. They think the platform is "special" as a group. . .and somehow different. Even though the basic suspension configuration has been in use since the 1984 Cherokee and live axles have been in use since the invention of the wheel. . . Yes, I just perpetuated a stereotype. It is called that for a reason. You need not think I was applying it to you. I hope not.
2. The specific "platform" is only a basis on which to build. The fact that it carries a JK emblem or a Toyota or a Radio Flyer or whatever. . .means absolutely ZERO. If you take any vehicle of similar size, weight and configuration, the ratios and ideas are equally applicable across the board.
Now, the idea of putting in an automatic locking carrier as an upgrade to avoid breakage. This is a "double edged sword" in the real World. Conventional wisdom is that lockers are for traction and not for strength. D44 carriers aren't known to be weak in the first place, but, if a person has the wheels spinning and shock loads the "non traction" side with a giant tire and a bunch of weight, the spiders are going to break into neat little chunks and start a pretty cool chain reaction that ends up being metal soup in a broth of gear oil. Now, if a person were hammering the throttle like that ONLY to keep forward progress because of a lack of traction, then a locker and the commensurate added traction can lead to a lower application of skinny pedal and/or less wheel spin in the same situation. However, for many situations where the driving style is dictated by the right foot of the driver, the locker just makes it so other things break first. Typically, it is an axle shaft or a driveline/joint, but the gear set and the locker itself have been known to grenade as well.
So, my point here is two-fold:
1. Listen to people with experience. It doesn't have to be with a JK. The fact is that the platform, while it is very cool, attracted an absolute crapload of people that only know and regurgitate what they also hear online and then spend their time justifying their decisions by trying to get the rest of us to make the same ones. (by the way, actual facial expressions, infection, body language, and sarcasm don't come through on the internet, so keep to the facts and don't let a perception of attitude get under your skin. I'm a reformed internet thug. . .take it from me).
2. Spending money on the axles you have isn't a good idea in your use case (rookie driver, huge tires). Period. The end. Don't do it. Run away. Sell the Jeep, send a check to (insert D60/Ford 9"/D70 company).. .whatever you have to do to NOT polish those axles. Now, conversely, since you have the locker coming, that's a GOOD thing as long as you adjust your driving style appropriately. The question you have to ask is, "how will I do that?" Driving effectively in our sport is 100% counterintuitive. So. . .It is a combination of seat time (good on you there) and paying close/careful attention to the guy in front of you.
Also, realize this: for most 4x4 platforms, the leap from 35 to 37" tires requires a HUGE commitment that is far beyond the cost of the tires. The massive leverage created makes the suspension and its mounting points very weak (even aftermarket stuff), it is very hard on transmissions, mounts and the poor little motor. Not to mention the cooling system.
Trust me on this. . .I have several horses in your race. I defer to Trash on the "what parts to put where" conversation and to Roy for "how to wheel a washing machine". . .but don't get caught up on your platform. It just doesn't matter.
As a matter of suggestion though. If you truly want to make 37s work with your Jeep. Your front end is probably squared away for a long while as it sits if you keep a steady right foot. A D60 or 9" would work well in the back. Automatic lockers (like a grizzly) work well in the rear because it is one less thing to remember to deal with on the trail. I'd also throw a truss or something on it to keep it all straight under the shock loads. Additionally, some beefing of the mounting points on the axles and frame wouldn't hurt. . .
But. My real and primary advise is always the same: be safe and burn gas. Lots and lots of gas.