Why do u hav to break n a new set of supermarket gears? IS there really a difference between oem an aftermarket gears?

 

Good question! I have always wondered why I can pick up a new Jeep with 7 miles on it and not worry about breaking in the OEM gears!

 

You must mean after market. Shouldn't really be too much of a difference between those and oem gears. Definitely know most vehicles kind of need to be brought up. Like no towing for the first couple thousand and such

From what i have read, the break in is all about heating up and cooling down the gears. Get them to operating temp, and stop until they completely cool multiple times.

After the break in period, its always good to get some fresh gear oil in there and take a look at the wear pattern. And swap diff covers if you are feeling custom

 

Ok now about changing the fluid. I was going to use synthetic gear oil but with the suggestions of changing the fluid after what's a good mileage to change it ? Alps what's a good fluid to break the gears n with? An does fluid need to b changed after break n period?

 

The theory is that gears are lapped before getting to the factory for install in the axles, or possibly lapped at the factory after install. And aftermarket gears are not, so they need a break-in.

Haven't seen anything to verify that, but it makes sense.


For the break-in, this is from the FAQ's at the top of this modified area. Good info, if you haven't bothered to open it yet.

Q: I just had my axles regeared, is there a break in period that I should be aware about?
A: Yes. After regearing your Jeep, you should try to go real easy on the gas and drive your jeep unloaded for about 15 to 20 miles. Stop and let your gears cool completely and then, try to drive nice and easy for about the next 250-500 miles. Change out your gear oil.

You could also try Randys Ring and Pinion. They have a good faq also, with more detail on break ins.

For the oil, since you are changing after only 500 miles, just use a cheap oil of the proper viscosity for break in (the bulk stuff the shop fills it with is fine.) And then you can go more expensive for regular use.

 

Dam man can't we Jus get new wrk done an go out an hav fun. Lol

 

Talk to your installer. If he is willing to warranty your new gears if you go to the track instead of doing a proper break-in, go for it.

I think MKJeep posted that he did not break in his gears, and has had no issues at all. But for the price I paid, I will err on the side of caution and go with the installers recommendation.

 

That would be awesome if Jeep parts were available at the supermarket. You could pick up beer , food, and lift kits and gears and etc....

 

The factory gears are already heat cycled before the Jeep hits the lot. New aftermarket gears have to break in with heat cycles and possible teeth alignment.

 

My installer said drive it how ever I wanted. If it blew apart he'd fix it. My first hour and a half miles was at 75-80mph steady no stops.Same thing next day. Dig's checked with a temp gun after and were in normal heat range. That said, it's your monkey to do what u want and or what installer recommends to be safe