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Old May 18th, 2007, 07:38 AM   #1
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Default Ok, whats the deal with breaking in gears. Is it necessary?

The old school guys will tell you that it is a must to do the warmup/cool down cycles on new gears.

The new school guys will toss in gears and give 100% throttle the first 10 seconds of the gears life. Saying there is no need for breaking in.

I guess if you go test drive a new pickup at the dealership, they don't make you do a gear cool down.

Any input?
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Old May 18th, 2007, 07:57 AM   #2
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The reason so much attention is given to proper set up is so that the gears mesh correctly from the git go. There is no such thing as a break in period.

Go ahead and drop the hammer CC.
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Old May 18th, 2007, 08:31 AM   #3
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Originally Posted by clarkstoncracker View Post
The old school guys will tell you that it is a must to do the warmup/cool down cycles on new gears.

The new school guys will toss in gears and give 100% throttle the first 10 seconds of the gears life. Saying there is no need for breaking in.

this sounds like the conversations that go on in my garage everytime my dad is over. Granted he is rigth on alot of things but Im not so sure about this. I mean if its set up correctly why would you need break-in? What is there to break-in? I always go back to "drag racers throw them in and hit the strip with 500hp plus" then he comes back with "but they don't generate the heat that comes with a bunch of highway miles at 70mph"

Curious to see what eveyone else thinks...
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Old May 18th, 2007, 09:02 AM   #4
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Well, drag gears aren't the same as regular gears.

They WILL generate excessive heat for the first ~50-100 miles.

Just drive it to work a couple days, thats usually perfect, a few ~10 mile trips and they are set.

Like any major mechanical part that can kill you if it fails, you usually want to do some test drives before hitting the open road or trail, anyway.

Its not listed in the manual because its just factored into the overall easy driving that you are supposed to do with any new car. If you ahve them replaced at the delare after that time, they will tel you a break in procedure. Well, they did every time they replaced them on my TJ. And each time, that first 50 miles, that diff cover was roasting hot.


Most 'New School' wheelers are idiots anyway. At least on this site :tonka: They think full throttle is the solution to evrything. That and paying someone to build their Jeep for them.


Now, if it was an engine, yeah, thats how I like to break them in, full throttle, with full vacuum coast downs.
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Old May 18th, 2007, 09:16 AM   #5
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What is breaking in on a new ring and pinion? Is it actually eating away the gears?
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Old May 18th, 2007, 09:19 AM   #6
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Hagger's right on!

I guess that I would look at it this way. Ever put a new gear set in? Notice the face of the gears is not as shiney as it is after they have been run. The idea is to let them mesh with out heat spots in the contact/ face of each tooth. There is a deeper science that deals with expansion and contration due to the heat build-up during the first miles, but I'm sure we can live with-out.

If you read most New Truck owners manuals, they specify at least 150 miles before towing with a new truck to break in the gear sets. And then even the first pull to be easy and let the rear end cool during your first trip with trailer.
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Old May 18th, 2007, 09:24 AM   #7
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Just drive it like it's Stan's


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Old May 18th, 2007, 09:35 AM   #8
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I've been Installing ring and pinions for about 10 years. Its always good practice to give them a good break-in period of about 50 miles of easy driving and a good cool down period of about 4 hours. Then for the next couple hundred miles try not towing with it. I would never just throw them in and beat on them it just shortens their life. The gears need to "mesh" with each other, and they kind of cut a pattern into themselves and the pattern is formed when they cool. thats just my 2 cents, and I've never had one come back.
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Old May 18th, 2007, 09:53 AM   #9
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I would never just throw them in and beat on them it just shortens their life.
how does it shorten their life? Will the teeth chip off? Will the gears start humming after awhile?


Okay so you are telling me that when you intsall gears in teh front and rear you drive around in 4X4 for 50 miles. I mean you need to get the front gears broke-in also...
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Old May 18th, 2007, 11:15 AM   #10
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The front gears are still turning and meshing together.
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Old May 18th, 2007, 11:20 AM   #11
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The front gears are still turning and meshing together.
they arent under power so they are coasting..
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Old May 18th, 2007, 11:21 AM   #12
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they arent under power so they are coasting..
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Old May 18th, 2007, 12:07 PM   #13
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here it is most of the gears purchased are aftermarket And they have a sulphur oxide on the just like a flat tappet camshaft. That is why they are black in color. When a gear or cam is not broken in properly or used heavily right away. The hardening process is gone. The sulfur oxide when run too hard burns off at such a high teperature that it boils the oil off. And then there is no lubrication where it is needed most.

OEM gears spicer included are already "lapped together" (Run as a set). There fore they are able to be driven right off the lot. But still require a 200 mile no load break in.

As far as most go in trail rigs and drag cars... Aftermarket gears never really get broken in properly. With that the gears gaul and gouge. peoples rigs/cars aren't suitable for the road wether they are not road worthy at speed, or not registered or what not. in any case the gears miss out on their crucial break in period especially with aftermarket gears.

So question the question in hand? Can you take off and run down the road Yes as long as it is a 20 minute drive no more than 50 MPH constant speed and let it cool for 2 hours. Have fun and enjoy. Get there early break them in let it cool and by late morning you will be running the coarse.
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Old May 18th, 2007, 12:22 PM   #14
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So Bill, a 20 minute drive and a cool down is all you recommend?
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Old May 18th, 2007, 12:34 PM   #15
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I don't know you but you seem to have a very good reputation around here so thanks for the explanation. I enjoy learning new stuff, especially stuff that will make me look smart......




I think I'm still gonna argue with my old man though cause he doesn't know any of that shit :tonka:
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Old May 18th, 2007, 12:59 PM   #16
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So Bill, a 20 minute drive and a cool down is all you recommend?
I would do it once again before you cruise it on the street, and don't go over 60 for the first few drives/cool downs. But just to do the coarse. I believe you will be fine after the initial drive/cool down.
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Old May 18th, 2007, 01:01 PM   #17
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Here's the break in procedure from Marlin Crawler, for reference.

New Gear Break-In Procedure

All new gear sets require a break-in period to prevent damage from overheating. Any overloading or over-heating will cause the gear oil to break down and the ring & pinion will fail. Please follow these guidelines to insure proper break-in.



Avoid heavy acceleration during the first 500 miles.
After light use for the first 15-20 miles it is best to stop and let the differential cool before proceeding.
Our warranty requires at least 500 miles differential break-in before towing.
The first time you tow the rig, travel a short distance (about 15 miles) and stop to let the differential cool before proceeding.
We highly recommend changing the oil after the first 500 miles. This will remove any metal particles or phosphorus coating that has come from the new gear set and bearings.

This may seem unnecessary but it is very easy to damage the differential by loading it before the gear set is completely broken in. The greatest damage results when a new ring & pinion has been run for several miles during the first 500 miles and the oil is very hot.

Any heavy use or overloading during the first 500 miles will cause irreparable damage to the gear set that can be determined by inspection of the gear set and will void our warranty.
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Old May 18th, 2007, 01:04 PM   #18
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I know once, we had a brand new durango (this was 1996, if you want to know just how new :tonka:), right from the pilot plant. We ran it on a chassis dyno, doing simulated testing driving Baker Grade with a 6,000lb trailer @ 105 degrees (F) outside temp, full throttle 0 - 70 runs.

After about 20 minutes, the diff fluid was around 430*F, and the gears failed.

It took me 2 showers to get that stink off me. Blech. Wasn't a good day to be a dyno driver.
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Old May 18th, 2007, 04:28 PM   #19
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Well I stand corrected.
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Old May 18th, 2007, 04:39 PM   #20
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Quote:
Originally Posted by KILLER"B"468 View Post
here it is most of the gears purchased are aftermarket And they have a sulphur oxide on the just like a flat tappet camshaft. That is why they are black in color. When a gear or cam is not broken in properly or used heavily right away. The hardening process is gone. The sulfur oxide when run too hard burns off at such a high teperature that it boils the oil off. And then there is no lubrication where it is needed most.

OEM gears spicer included are already "lapped together" (Run as a set). There fore they are able to be driven right off the lot. But still require a 200 mile no load break in.

As far as most go in trail rigs and drag cars... Aftermarket gears never really get broken in properly. With that the gears gaul and gouge. peoples rigs/cars aren't suitable for the road wether they are not road worthy at speed, or not registered or what not. in any case the gears miss out on their crucial break in period especially with aftermarket gears.

So question the question in hand? Can you take off and run down the road Yes as long as it is a 20 minute drive no more than 50 MPH constant speed and let it cool for 2 hours. Have fun and enjoy. Get there early break them in let it cool and by late morning you will be running the coarse.

exellent topic, just what i needed.........

i am going to miffy spring fling next weekend and i will be installing new gears frt/rr on tues nite (knock on wood that they come in) so this was right up my alley

and the question on frt gear break in, not everybody has engaged frt axle while driving in 2wd, i have hubs to lock unlock--so should i drive it with the hubs locked in to break those in?
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