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Does a new ring/pinion need to be broken in?

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Old 10-21-2007, 01:37 PM
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Default Does a new ring/pinion need to be broken in?
Just installed an Eaton posi unit and a new 3.73 ring and pinion. Car is used for bracket racing (drive to the drag strip is approx 30 miles each way). Thanks
Last edited by omcar; 10-21-2007 at 04:05 PM.
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Old 10-21-2007, 03:16 PM
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Yes. Heat cycle them several times, and then put some miles on them as well. After 2-3 heat cycles, I would drive them for at least a few hundred miles under low load. It would be even better to go 350-500.
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Old 10-21-2007, 03:29 PM
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is 30-50 miles at moderate mph and then a cool down period considered a heat cycle?
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Old 10-21-2007, 03:51 PM
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Originally Posted by omcar
is 30-50 miles at moderate mph and then a cool down period considered a heat cycle?
Absolutely. In fact, a shorter interval of mileage, like 10-15, would also suffice.
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Old 10-21-2007, 04:05 PM
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great..thanks
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Old 10-21-2007, 06:46 PM
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Anytime
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Old 10-22-2007, 11:44 AM
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Originally Posted by BriancWS6
Yes. Heat cycle them several times, and then put some miles on them as well. After 2-3 heat cycles, I would drive them for at least a few hundred miles under low load. It would be even better to go 350-500.

Absolutely! We go 500 miles, and we also break in on regular Dino lube & replace w/full synthetic after that. If you use Syn from the beginning we see high spots in the wear patterns & shorter gear life.
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