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Old 05-03-2012, 09:12 AM   #1
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Break in period for new gears?

Whats the proper gear ratio break in period? I got 4.88's put in yesterday and I noticed a slight wobble when I reached around 55mph. Nothing too serious, I'm
Just curious if maybe I need to break them in or did the shop mess up my alignment??

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Old 05-03-2012, 09:16 AM   #2
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I have never broke in a set of gears although some people claim its necessary. The guy who does mine told me to drive it like I stole it and roll on

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Old 05-03-2012, 09:31 AM   #3
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Do you think the wobble was due to the alignment?
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Old 05-03-2012, 09:34 AM   #4
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Man I dunno, most of the time they just pop the tierod off one side to do the swap....could be tires too I guess.
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Old 05-03-2012, 10:01 AM   #5
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I don't see how new gears would cause a wobble. And why anyone wouldn't follow a strict break in procedure on a very expensive new set of gears is beyond me. Its not so much for the gears but for the bearings. New bearings have a lot of preload and generate a lot of heat. If they get to hot from a lot of driving it will guarantee you burn the gear oil which can in turn ruin your brand new gears.

At the very least change the gear oil after 500 miles to remove metal shavings.
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Old 05-03-2012, 10:09 AM   #6
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He knows his stuff so whatever he says is fine with me....he is a TTC winner and does diffs for a living.
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Old 05-03-2012, 10:11 AM   #7
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^^ What he said. I've changed gears on trucks before and never had any issues. Gears that are correctly installed would not cause a wobble. Either there is a gear issue or its something else. If its the gears I am sure it will show itself shortly. Also, I would go easy for about 100 miles then change the fluid at about 500-1000 miles to be safe. Cheap insurance.

edit: I should have said I've HAD gears changed before....lol
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Old 05-03-2012, 10:13 AM   #8
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Another thing to think about is when vehicles are new, they dont have any miles on them and are not required a breakin
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Old 05-03-2012, 10:27 AM   #9
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Gear companies sometimes say to break in a few miles, but we've done countless gears on Mustangs then take them to the track that night. Never had any wobble though. Had them explode, but not wobble. lol
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Old 05-03-2012, 10:38 AM   #10
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Right, you guys do whatever you want but if I've just dropped 1k+ in new gears i'm going to take it easy while the gears wear in and bearings loosen up, cheap insurance. And frankly its bas business practice to not give customers a break in procedure. Its an easy way to prevent more failures and not be losing money on gear set ups because it has to be done twice. I don't care if your the freakin gear god installer himself.
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Old 05-03-2012, 10:42 AM   #11
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Quote:
Originally Posted by Ibuildembig
Another thing to think about is when vehicles are new, they dont have any miles on them and are not required a breakin
How many new cars have you bought off the lot with less than 50 miles? Vast majority of new cars are test driven (which is perfect break in) and have at least a couple hundred miles on the odo.

My parent just leased two brand new hyundais with 300 miles on the odo. They go in next week for the 500 mile fluid change.
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Old 05-03-2012, 10:43 AM   #12
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If they are installed correctly, there's no issue.
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Old 05-03-2012, 10:44 AM   #13
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How many new cars have you bought off the lot with less than 50 miles? Vast majority of new cars are test driven (which is perfect break in) and have at least a couple hundred miles on the odo.

My parent just leased two brand new hyundais with 300 miles on the odo. They go in next week for the 500 mile fluid change.
Id say at least 10-15 in the last 20 years but I dont buy new that often
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Old 05-03-2012, 10:47 AM   #14
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Look, I'm not saying every gear set is going to fail if you don't follow some rigorous procedure, but why wouldn't you? You wouldn't go hammering on a brand new engine would you? And no body give the "well on the track" bs. This isn't a track.
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Old 05-03-2012, 10:49 AM   #15
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definitely no break in time for gears. new cars have brand new gears and they don't specify that you break those in.
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Old 05-03-2012, 10:51 AM   #16
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Actually I as well as alot of people break in a motor the same way they drive it. I promise when my GE jeep is able to be driven, it will go flat on the floor in every gear.
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Old 05-03-2012, 10:55 AM   #17
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Quote:
Originally Posted by Miguedona21 View Post
Whats the proper gear ratio break in period? I got 4.88's put in yesterday and I noticed a slight wobble when I reached around 55mph. Nothing too serious, I'm
Just curious if maybe I need to break them in or did the shop mess up my alignment??
My guess is they didn't install the shafts, unit bearings, rotors and wheels in the EXACT same orientation as before - they're just indexed different. The stacked tolerance in all those parts is probably enough to make the whole rotating assembly slightly off-balance....so you got a slight wobble.

As for breaking in the gears themselves, I've heard lots of different stuff. I say drive it, vary your speeds regularly and change the diff oil at 500miles. While the cover is off, inspect the gears for damage or wear pattern problems. After that, just drive it like normal.

Quote:
Originally Posted by Ibuildembig View Post
Another thing to think about is when vehicles are new, they dont have any miles on them and are not required a breakin
Ahh...actually you are. I don't remember of the top of my head what the break-in recommendations for the TJ were, but I can dig my manual out and find it. There is a statement in first few pages talking about break-in for engine, transmission and axles. Something to the effect of drive with varied speeds, keep it under 40mph or whatever for the first 100 miles or something, then keep it under 60mph or whatever for 500 miles, etc...etc..
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Old 05-03-2012, 10:59 AM   #18
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Oh Im sure your right but its not required like I said....if it was required, you would have to sign off on that statement when purchasing or the dealer would do it for you. Its more of a suggestion I guess, kinda like not driving your jeep with water over the hood
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Old 05-03-2012, 11:11 AM   #19
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heres a link from Randys ring and pinion on gear break in


New Gear Break In
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Old 05-03-2012, 01:31 PM   #20
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Thanks for all the info. I will continue to take it slow. Is the gear oil change something I could do? I also forgot to mention that I got my rear breaks and break cylinders replaced as well. I'll continue to drive and see how things roll.
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Old 05-03-2012, 05:17 PM   #21
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I was told by the shop that did mine to change the gear oil after 1000 miles, just to clean out any shavings from the new setup, other than that just run em.
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Old 05-03-2012, 07:12 PM   #22
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I was told to drive at no higher than 65 for the first 500 miles and to stop every 50 or so on long trips to let the diff cool down. I had ARB diff covers put on and the magnets on the ends of the plugs were just covered with shavings from the new gears and locker. I don't know, do what you feel is right.
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Old 05-03-2012, 07:15 PM   #23
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Originally Posted by Miguedona21 View Post
Thanks for all the info. I will continue to take it slow. Is the gear oil change something I could do? I also forgot to mention that I got my rear breaks and break cylinders replaced as well. I'll continue to drive and see how things roll.
Yes, stinky but something anyone can do with a funnel, something to catch the fluid, and the fluid. (If you have a diff cover with a drain plug). If not you are going to need a seal, and a couple of rags.
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Old 05-03-2012, 07:20 PM   #24
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Quote:
Originally Posted by Kota7x

Yes, stinky but something anyone can do with a funnel, something to catch the fluid, and the fluid. (If you have a diff cover with a drain plug). If not you are going to need a seal, and a couple of rags.
YouTube will be my professor. And yea I called my mechanic and told me similar things, I'm just a little concerned about the wobble. Maybe I just need an alignment...
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Old 05-03-2012, 07:43 PM   #25
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The wobble only happens at 50mph. Any faster or slower it goes away.
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Old 06-13-2013, 07:47 AM   #26
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Originally Posted by Ibuildembig View Post
Another thing to think about is when vehicles are new, they dont have any miles on them and are not required a breakin
Gears are lapped at the factory on new vehicles and do not require the break-in procedure.
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Old 06-13-2013, 07:59 AM   #27
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Originally Posted by freeskier View Post

How many new cars have you bought off the lot with less than 50 miles? Vast majority of new cars are test driven (which is perfect break in) and have at least a couple hundred miles on the odo.

My parent just leased two brand new hyundais with 300 miles on the odo. They go in next week for the 500 mile fluid change.
Three new cars all less than 6 miles on the odometer.
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Old 06-13-2013, 08:07 AM   #28
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Three new cars all less than 6 miles on the odometer.
The only time a new car has more than 5-6 miles is if they pick it up from another dealer and had a transporter drive it. Some dealers will transport new vehicles on flatbeds to not add any miles to the brand new vehicle. I ordered mine at the dealer so I did not have to accept a vehicle on the lot with something I did not want and when I picked it up from the dealer I drove it to work and back, 100 miles, keeping it under 50 mph and then it was pedal to the metal.
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Old 06-13-2013, 08:50 AM   #29
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The only time a new car has more than 5-6 miles is if they pick it up from another dealer and had a transporter drive it. Some dealers will transport new vehicles on flatbeds to not add any miles to the brand new vehicle. I ordered mine at the dealer so I did not have to accept a vehicle on the lot with something I did not want and when I picked it up from the dealer I drove it to work and back, 100 miles, keeping it under 50 mph and then it was pedal to the metal.
Imagine the new car with 300 miles. Probably the hardest 300 miles that car will see. All during the "break in" period.
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Old 06-13-2013, 09:11 AM   #30
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Gear companies sometimes say to break in a few miles, but we've done countless gears on Mustangs then take them to the track that night. Never had any wobble though. Had them explode, but not wobble. lol
Had 3:73's put in my 88 Mustang GT a few years ago, beat the hell out of it right out of the shop. Never had a problem.

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