new 12bolt

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Sep 28, 2011 | 12:45 PM

ls1m6nichols

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new 12bolt

i just installed a 12bolt detroit true trac with a 3.90 gear 30 spline how many miles do i need to keep it easy on it or how should i break it in
Thanks

Sep 28, 2011 | 01:43 PM

MeentSS02

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New gears (as in not run before)?

New gears generate lots of heat during run-in, and that tends to be what causes issues. When I asked this question in the past, I was told 10 total heat cycles (full warm up to full cool down), change the oil, then go for it. For the warm-up, they recommended a full 30 minute or so drive including at least some highway driving to get everything up to temp, and for the cool-down, let it sit all day or overnight.

Sep 29, 2011 | 08:26 AM

ls1m6nichols

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Will a new gear whine a little and quiet down when worn in
Thanks

Sep 29, 2011 | 08:42 AM

marubsls1

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i was told easy on it for 500 miles then change the fluid then you can get on it hard stange 12 bolt 4:11s posi

Sep 29, 2011 | 08:50 AM

MeentSS02

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Quote:

Originally Posted by ls1m6nichols

Will a new gear whine a little and quiet down when worn in
Thanks

If it whines now, it will probably always whine. The new gears in mine whined loud right from the start, and are still just as loud if not louder.

Sep 29, 2011 | 10:21 AM

marubsls1

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If it whines now, it will probably always whine. The new gears in mine whined loud right from the start, and are still just as loud if not louder.

Mine was just like that I had pro gears n switched to street gears n the is no whine