Limited slip additive? Sealant or gasket? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 06-06-2010
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Limited slip additive? Sealant or gasket?

Well I replaced my rear pinion seal and I was gonna replace my axle oil.

I got the correct fluid as stated in my manual, but my buddy said I might have to put limited slip additive in the axle.

Plus is their a gasket or sealant for the rear cover of the axle?
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Old 06-06-2010
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I used red RTV sealant and has held up great for the last 4 or 5 months.
And ya if you have a limited slip diff then you need a limited slip additive.
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Old 06-06-2010
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You only need a limited slip additive if you have a limited slip or locker. Also, most synthetic gear oils don't require a friction modifier.

I'd use an RTV silicone gasket maker for the gasket between the housing and cover. Just be sure to clean both surfaces or it will leak fluid. Permatex also makes a new sealant that is specifically designed for use on differentials.
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Old 06-06-2010
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Thanks for the help, I do have limited slip, so I'll grab the additive and sealant
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Old 06-10-2010
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Like its been said if you have a LS then you'll need that additive, most of the better brands already have that modifier in them. I used cheap oil so it didn't have it and then got a bottle and added half the amount your suppose to. Works great and locks up well for me.
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Old 06-10-2010
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Quote:
Originally Posted by 01RangerEdge View Post
Thanks for the help, I do have limited slip, so I'll grab the additive and sealant
Run royal purple (additive already in the lube) and RTV and you will be fine.
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Old 06-10-2010
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Grey RTV.
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Old 06-10-2010
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Using sealant not a gasket. I recommend the orange high temp stuff.
If the gear oil says "limited slip" on it, do not use more additive.
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Old 06-10-2010
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post above me is perfect.
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Old 06-10-2010
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Thanks for the advice, I need to do this.
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