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Unread 11-04-2013, 06:46 AM   #1
LeePrather
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1978 CJ5 
 
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Fluids

Is there any issue running royal purple 75w-90 in tcase, tranny and diffs?

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Unread 11-04-2013, 07:11 AM   #2
WindKnot
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The FSM calls for 80wt GL-4 in the transmission & transfer case.
Differentials are 80-90wt GL-5 for open, & Trac-Loks want 80-90wt GL-5 LIMITED SLIP.

Personally, I would NOT use a GL-5 oil where GL-5 oil is called out. GL-5 has a higher sulphur content which will attack brass components. A differential has no brass parts, so the GL-5 is useful.

The oil weight is probably fine. Worry about the additives.
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Unread 11-04-2013, 07:41 AM   #3
LeePrather
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Quote:
Originally Posted by WindKnot
The FSM calls for 80wt GL-4 in the transmission & transfer case. Differentials are 80-90wt GL-5 for open, & Trac-Loks want 80-90wt GL-5 LIMITED SLIP. Personally, I would NOT use a GL-5 oil where GL-5 oil is called out. GL-5 has a higher sulphur content which will attack brass components. A differential has no brass parts, so the GL-5 is useful. The oil weight is probably fine. Worry about the additives.
I saw most people recomending the 75w-80, but I couldn't find any...it's just crazy how different this stuff can be when it looks so similar...
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Unread 11-04-2013, 07:43 AM   #4
CSP
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Royal Purple is a synthetic and synthetic GL5s don't have the sulphur that eats yellow metals. It should be fine in all of the gearboxes.
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Unread 11-04-2013, 01:25 PM   #5
LeePrather
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Quote:
Originally Posted by CSP
Royal Purple is a synthetic and synthetic GL5s don't have the sulphur that eats yellow metals. It should be fine in all of the gearboxes.
Thanks...it ain't cheap and I wanted to cover them all
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