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Switching to synthetic gear oil- question

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Old Nov 27, 2011 | 11:41 AM
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Three Wheeling
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Default Switching to synthetic gear oil- question
Going to switch to synthetic, probably Royal Purple 75w140, in my front and rear differentials. Any problem with draining the old and filling up w/ the new, or do I need to clean it out somehow?
 
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Old Nov 27, 2011 | 11:45 AM
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Nope, no problems.
 
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Old Nov 27, 2011 | 12:15 PM
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No problems until you need to drain out the $150 worth of gear lube you put in because you went wading or there is a seal you need to replace.
 
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Old Nov 27, 2011 | 01:06 PM
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Danny Lee 97 Disco's Avatar
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I used Mobil One75/140 in my T/C, it was pretty cheap. Still got the 75w90 Valvoline dinolube in the diff's for now. The Mobil One quieted the T/C down nicely. Diff's doing fine on the lower viscosity.
 
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Old Nov 27, 2011 | 03:41 PM
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Three Wheeling
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$150? Hadn't priced it yet, just researching on the web. Time to shop around.
 
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Old Nov 27, 2011 | 04:00 PM
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Originally Posted by sclarkie
$150? Hadn't priced it yet, just researching on the web. Time to shop around.
$20 per quart, you need 7qts to do both diffs and the t-case.

Royal Purple/1 qt. 75W-90 synthetic Max-Gear oil (01300) | Gear Oil | AutoZone.com
 
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