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New gear break in

Old 1/19/19, 05:50 PM
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New gear break in

is it wise to dyno tune after installing new gears. I understand that the car needs to be tuned to correct the speedo, but is dyno the way to go if there is a break in period? When I am ready to get the gears in the near future, Im also installing a new 1 piece driveshaft, lsd, axles, shorties, h pipe, cat back, shifter, and throttle body, so a tune will be necessary, but to push the new ring and pinion that soon seems like danger? Enlighten me.
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Old 1/20/19, 04:26 AM
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If the gears are installed 'right', no break in is needed. When I had my dealer install my 3.73's on my 2011 v6, I did a 500 mile break in 'only' for 'my' peace of mind. Didn't have to but did it anyway

The Lsd your talking about if I understand what your asking, we already have one. .

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Old 1/20/19, 05:05 AM
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Thank you for your reply. I was concerned about pushing the new ring and pinion gears so hard for dyno runs on the first day of installation, however, I never heard of or read of anyone having trouble, so I guess it should be fine. As far as the lsd, I was planning to have the Ford Performance Traction-LOK Installed. I figured since its all opened up, why not beef thing up a little. Im closing in in 70000 miles, so, why not.
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Old 1/21/19, 12:19 PM
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Originally Posted by Passtimik View Post
Thank you for your reply. I was concerned about pushing the new ring and pinion gears so hard for dyno runs on the first day of installation, however, I never heard of or read of anyone having trouble, so I guess it should be fine. As far as the lsd, I was planning to have the Ford Performance Traction-LOK Installed. I figured since its all opened up, why not beef thing up a little. Im closing in in 70000 miles, so, why not.
Is that limited slip any different than what is currently on your car? Most standard (non racing or track pack) Mustangs have the clutch style LSD from the factory. I'm not sure what that unit would offer over the stock unit - assuming it's even any different.
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Old 1/21/19, 01:01 PM
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My installer told me not to worry too much about break-in for my 3.73 gears; "just do a couple of heat cycles and you should be good." A "heat cycle" is one cycle of getting them warm then cooling off. I drove to the store about 15 minutes away, let them cool while I shopped, then drove home . . . he said that should be fine. But I think he might have been oversimplifying; if I was going to do it again, I would do the same, but make sure I drove at varying speeds during the warm-ups, and drive at least 30 minutes so they get good and warm, and let cool for at least a few hours.

I did a dyno run pretty quick after the trip to the store and back, and I always wondered if that had anything to do with the gear whine that I have now. It is not super bad, but definitely noticeable. The 3.73's are known for whining (sometimes) so I don't know if it really made any difference. If I was going it over, I would give them a better "break in" as described above; and probably 4 good heat cycle, not just two; just to make myself feel better.
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Old 1/22/19, 05:40 AM
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Joeywhat:
according to American muscle the v6 mustangs have an open differential: https://www.americanmuscle.com/differential-types.html
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Old 1/22/19, 05:41 AM
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Joeywhat:
according to American muscle the v6 mustangs have an open differential: https://www.americanmuscle.com/differential-types.html
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Old 1/22/19, 06:41 AM
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I know for sure that every 2011 and up has it, possibly starting sooner. My V6 most certainly came factory equipped with a clutch style LSD.
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Old 1/23/19, 04:30 AM
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Our 2011-2014 v6 Mustangs have the same 8.8 rear end's used in the v8 GT Mustangs We 'do not' have an opened differential …………….
.

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Old 1/23/19, 10:18 AM
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Originally Posted by David Young View Post
. . . We 'do not' have an opened differential .
thank goodness for that! all kinds of bugs and stuff would get in there, and the oil would fall out . . . ;-)
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