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Break in motive 3.73 gears?

 
Old 07-21-2012, 06:36 AM
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Question Break in motive 3.73 gears?

Ill be driving the car home 80 miles from the shop with new 3.73 motive gears. Mostly all highway. What is the way these need to be broken in? This will be a major PITA if I need to keep the mph low and stop a million times coming home to let them cool

What do you guys say?
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Old 07-21-2012, 08:54 AM
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Per the instructions, what you are planning on doing is exactly what they say not to do. At the very least stop once and let it cool. New gears get HOT.
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Old 07-21-2012, 10:18 AM
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Yeah, I would drive it ten miles or so stopping and going regularly throughout the trip. After the 10 miles, stop and get something to eat or something so the gear set can cool off a bit and do it again. Should be fine to do whatever after that. It really doesn't take much to break in new gears.
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Old 07-21-2012, 02:38 PM
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Well I made a 60 mile trip nonstop on the highway. Installer said he did a couple cycles after the install and I would be fine.
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Old 07-21-2012, 03:43 PM
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from what i researched when i did mine (and my friends 8.8), the initial heat cycle was the most important. Once you heat and cool down the first time, you can drive around without a problem, just no punishment. Honestly, I did some street launches after 200 miles and haven't had any issues, but i still wouldn't recommend it till after 500 just to be safe.
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Old 07-21-2012, 04:48 PM
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changing speeds every ten minutes helps things seat i was told. im still breaking in my 4.10s.
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Old 07-22-2012, 02:24 AM
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If you have to drive all highway, take every other on/off ramp so you will not have a constant load on the gears. This varies things a bit and I believe helps a lot. I even do this when I buy new cars! I also agree with one of the other posts. Drive about 10 minutes and get something to eat. Then I would drive another 30 minutes and repeat after an hour of cool down drive an hour and let it cool down and then you are home!

I believe in 3 heat cycles. I dont know if its right, but its always worked for me!

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Old 07-22-2012, 08:17 AM
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The bulider and tuner (which I trust) put 2 cyles on before I picked up the car.

1 Took the the car for a test drive for 10 miles up to 50mph...then let car sit at his shop maybe 15 min.
2 Drove car 60miles on highway then car sat for 2-3 hrs.
3 Drove car home on highway 30 miles then car sat 3 hrs.
4 Then that night took car out, drove 15 miles highway/street and let car sit 15 min. I did this (#4) 3 times before bringing the car home to sit over night.

Anyone see anything wrong with this? lol I have 200miles on the gears so far.
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Old 07-22-2012, 09:49 AM
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Nope, you're good man. Take it out and have fun now
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Old 07-22-2012, 10:57 AM
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Originally Posted by Ethan[ws6] View Post
Nope, you're good man. Take it out and have fun now
Yea? Cant wait!

I took it for a 15 mile ride today on way to gym, let it cool for 45 min. Then took for another ride 15 miles and now ill let it cool maybe a couple hrs.
I was thinking on putting another 100 miles on or so today then letting it cool, and then having fun. Think im all set though huh?
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Old 07-22-2012, 12:06 PM
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id have it drained and refilled and you should be good.
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Old 07-22-2012, 12:12 PM
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I drove 2 heat cycles with low diff fluid. It had a very slight wine at 50. Now, even after a fluid change at 1000 miles, 5K miles later my gears are starting to get louder
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Old 07-22-2012, 09:53 PM
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Did a couple more cycles today and did some 1/2 and 3/4 throttle. I can hear the gears whining.
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Old 07-23-2012, 08:22 PM
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mine dont whine. i dont think thats good.
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Old 07-24-2012, 06:43 AM
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If you are hearing whining it is most definitely due to improper set up. Most likely, pinion depth is off just a touch. As long as the whine isn't unbearable, it won't hurt anything. if it were me, I would take it back to them and ask them to fix it. Before they even try, don't let them feed you the same BS as everyone else.. "Sometimes different manufacturers gears whine." That would be false lol.
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Old 07-24-2012, 03:16 PM
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Its not loud at all. On the highway I can hear it very little but on decel I hear it just a tiny bit more. You have to know what your listening for to actually hear it.
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Old 07-24-2012, 03:35 PM
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mine 4.10s dont whine. my 3.73s did and they fell apart.
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Old 07-24-2012, 04:11 PM
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Well no use crying over stuff I cant control...lets see how long they last before I get a 12 bolt or 9" aye? ha
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Old 07-24-2012, 05:39 PM
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Originally Posted by senicalj4579 View Post
Well no use crying over stuff I cant control...lets see how long they last before I get a 12 bolt or 9" aye? ha
normal driving itll last awhile. at least mine did. but it was a time bomb lol.
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Old 07-24-2012, 06:09 PM
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When I put 373's in my 98, they screamed until I got around 1k miles on them and the noise pretty much went away. Probably wasn't the smart thing to do to keep driving it, never had any problems though.
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