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Unread 10-12-2007, 03:19 PM   #1
snellav
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New Gears-Break in period?

Ordered my new 4.10 gears for my front axle today. What do I need to do to properly break them in? Would it be a bad idea to go wheeling within a few days of having them installed?

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Unread 10-12-2007, 03:39 PM   #2
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When you first get them, drive about 15 miles, then stop and let them cool for about 20 - 30 mins. Then do one more cycle of that. Then drive them normally for 500 miles and then change the diff fluid. No wheeling or hard driving in the first 500 miles.
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Unread 10-12-2007, 03:41 PM   #3
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No highway during break-in...
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Unread 10-12-2007, 03:50 PM   #4
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I always hear the same things about a 500 mile break in for new gears. But what is so different than when it comes brand new off the assembly line. Jeep doesn't tell you to do all that stuff with easy driving for 500 miles and then change the diff fluids. So what makes a gear change rather than a brand new axle from the factory so different that it requires this special attention and service?
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Unread 10-12-2007, 03:54 PM   #5
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Quote:
Originally Posted by chefdab
I always hear the same things about a 500 mile break in for new gears. But what is so different than when it comes brand new off the assembly line. Jeep doesn't tell you to do all that stuff with easy driving for 500 miles and then change the diff fluids. So what makes a gear change rather than a brand new axle from the factory so different that it requires this special attention and service?
Mine are 4.88's and 35's. I thought it wasn't worth it to not break them in...

http://www.4x4now.com/gt0999.htm
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Unread 10-12-2007, 04:33 PM   #6
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Quote:
Originally Posted by chefdab
So what makes a gear change rather than a brand new axle from the factory so different that it requires this special attention and service?
I've often wondered the same thing but if the vendors and mechanics all say to do it then I'll do it. Going to 4.88s with rear ARB as soon as the parts get here.

I'd love it if someone who knows for sure why aftermarket needs a break in period would chime in.
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Unread 10-12-2007, 05:10 PM   #7
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Quote:
Originally Posted by daveshan
I'd love it if someone who knows for sure why aftermarket needs a break in period would chime in.
Dave, did you read the article from the link above?

http://www.4x4now.com/gt0999.htm

I think it's a pretty good explanation and written by someone who should know. Good luck with the ARB and 4.88's; we're running that with no issues. One thing to be sure of, if you didn't know already, is to be certain the drain back holes are cut during the ARB install (it's in the instructions) so you don't pump the gear lube out the breather during break in.
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Unread 10-12-2007, 07:29 PM   #8
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Quote:
Originally Posted by chefdab
I always hear the same things about a 500 mile break in for new gears. But what is so different than when it comes brand new off the assembly line. Jeep doesn't tell you to do all that stuff with easy driving for 500 miles and then change the diff fluids. So what makes a gear change rather than a brand new axle from the factory so different that it requires this special attention and service?

Well, I didn't buy my Jeep new, so I didn't look at the engine break-in period. I did the regear when I got the Jeep.

However, every new car I have had, the recommendation was a 1,000 mile break-in on the engine. So, obviously, the diff gears would be covered in that.
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Unread 10-12-2007, 11:11 PM   #9
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but how are you to properly break in gears for the front axle without going off-road?
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Unread 10-13-2007, 12:00 AM   #10
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Quote:
Originally Posted by bigj1974
but how are you to properly break in gears for the front axle without going off-road?
Yeah this is my question too. I swapped in my rubi d44 so those gears are already broken in. Only gears I have to break in will be in the front axle. I basically wanna know how long until I can wheel it
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Unread 10-13-2007, 12:13 AM   #11
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Quote:
Originally Posted by bigj1974
but how are you to properly break in gears for the front axle without going off-road?
They don't make gravel roads in your part of the country?
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Unread 10-13-2007, 12:19 AM   #12
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Originally Posted by Stu Olson
They don't make gravel roads in your part of the country?
at least where i live its a bit of a drive to find anyplace that isnt paved where its legal to drive
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Unread 10-13-2007, 06:14 AM   #13
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In a Jeep just driving turns the front gears. No hubs remember.
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Unread 10-13-2007, 06:26 AM   #14
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Quote:
Originally Posted by robncar
Dave, did you read the article from the link above?

http://www.4x4now.com/gt0999.htm
OOPS, at a glance I thought it was part of your sig' Good writeup and explains a lot.
Thanks
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Unread 10-13-2007, 07:57 AM   #15
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Quote:
Originally Posted by chefdab
I always hear the same things about a 500 mile break in for new gears. But what is so different than when it comes brand new off the assembly line. Jeep doesn't tell you to do all that stuff with easy driving for 500 miles and then change the diff fluids. So what makes a gear change rather than a brand new axle from the factory so different that it requires this special attention and service?

Dana laps the gear sets, on the assembly line, before delivering the axles to Chrysler. They already have a few hours of 'wear', before they are installed on the Jeep.
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