Rear diff oil additive ?

**Weathermanmc** · #1 (**permalink**) 03-16-2010, 04:03 PM

Hopefully this weekend I will be regearing my truck, I was thinking that I would use Amsoil 75-140 extreme gear full synthetic oil in the rear. My truck has the stock limited slip so do I need to add the friction modifier if I use this synthetic oil? Whats your thoughts?

Thanks,

yosh30 · #2 (**permalink**) 03-16-2010, 05:35 PM

I used royal purple duferential oil, and it has the friction modifier within the oil already.

Davey~do · #3 (**permalink**) 03-16-2010, 05:57 PM

The spec sheet on the web site doesnt say that it does, nor does it say it doesnt. For some reason I am quite sure it does though. Not much help but maybe the bump will get someone for you that does know for certain.

**PGreenSVT** · #4 (**permalink**) 03-16-2010, 06:13 PM

Put the Amsoil in. If it chatters on turning add the friction modifier.

**Weathermanmc** · #5 (**permalink**) 03-17-2010, 07:42 AM

Cool deal guys thanks for the replies! But if anyone knows for sure please let me know.

Thanks

dusted4eva · #6 (**permalink**) 03-17-2010, 07:57 AM

AMSOIL SEVERE GEAR is compatible with most but not all limited slip differentials. If limited slip differential chatter occurs, add AMSOIL Slip-Lock™ friction modifier additive.
I have the Amsoil sever gear in my rig but as an added precaution I did add the modifier. It's only 10 bucks.

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