Originally Posted by Sahara Lee

And no, all gears are not the same. The source of the steel used to make the gears makes a big difference in strength and wear resistance. The installer is also important. They should be experienced enough to spot poor fitting or underrated parts and correct potential problems before they become actual problems. When was the last time you heard of an installer lapping the rear face of a ring gear or even checking the run-out after installation? Does the installer give you a written brake-in schedule? Since factory components go through a break-in at the factory people tend to discount the importance of proper break-in for upgrades.

Originally Posted by badeye

Check out 4WS.com. They are a sponsor on here. I got a set of front and rear Yukon 4.56 's (and master rebuild Timken kits) from them at an unbelievable price. Did the rebuild myself while installing trutracs in front and rear. These gears set up really nicely. I re-installed using the same shims that came out of old gear set-up. Contact pattern and backlash were spot on. Only had to add a small amount of shim to get the differential preload to factory specs. The gears run smooth and quiet. I'm very happy with them. I've read only good things about the strength of Yukon gears.

Originally Posted by BarbarianBandit

I just recently had Nitro 4.10 gears installed in my JK because Yukon doesn't make 4.10 gears apparently. I have a little over 500 miles on them, and can report that there is no howling or noise coming from the new gears. Just changed out the gear oil at 500 miles and all appears to be wearing normally. If my gears end up failing I will be sure to let everyone know. So far so good though. Most ring & pinion sets appear to be made in China unfortunately.

Originally Posted by Kevin123

Just had my Nitro gears (4:10's) installed today and I ask the guy that did it, who worked for TXDOT for 35 years as a mechanic about break in and he said drive it how you always drive it. He also put my 4:88's in my 08 and never had a problem. My bolt's for the gears came in the master install kit, so gears shouldn't have anything to do with the bolts breaking unless installed wrong.

Originally Posted by Invest2m4

While this goes against what most say, it strikes me as logical. Can't say I ever bought a new Jeep or car and on my way out they told me a break in procedure for the gears. So why is it different after a regear?!?!

Originally Posted by WHT_JKUR

Are you talking about the "gear package" they offer? They don't mention a brand. Are they Yukon? I assumed they were Standard gears at that price. If they are Yukon seems like a good deal.