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 Post subject: New Gear Setup?
 Post Posted: Sun Apr 11, 2010 6:24 pm 
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How much heat is too much in the pinion area on a rear differential? I checked mine several times on the 120 mile trip to Piedmont Dragway today and I'd like some opinions/experiences with others that have ever bothered to check temps on the rear end.

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 Post subject: Re: New Gear Setup?
 Post Posted: Thu Apr 15, 2010 2:45 pm 
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Got the following message back from Motive Gear Tech Support today. This kinda eases my mind on the heat the rear end is generating. We'll watch it for the next few trips to make sure I don't fry anything.

Morive Gear wrote:
Ken, the following came from one of my engineers:

All temps begin to come down as the rear end is broken in over a few thousand miles – just like an engine, without the recirculation oil and cooling system.

The danger zone of temps is really dependent on oil – some break down at lower temps than others. Once compromised, the oil is gone and doesn’t repair itself.

So – there is no “right” answer. Application, oil, etc. will determine the answer.

In his case, towing, and not knowing oil, etc., I would not want to see temps over 240. If he keeps it below that for 1000 plus miles, he should be fine for a long lasting tow rig. If it has exceeded that, and is not a good synthetic, he should change the oil now.

Thanks Bob

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