Royal Purple rear end fluid?
#1
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Car: 1984 Z28 HO
Engine: GMPP 350 HO
Transmission: 700R4 w/TCI streetfighter kit
Axle/Gears: 3.73 28 spline Eaton posi
Royal Purple rear end fluid?
Hi all.Can anyone tell me if I use royal purple rear end fluid that says it's good for posi rear ends,do I still need gm posi additive.I have an eaton posi with 3.73 gears.Thanks in advance for your help.
#2
Re: Royal Purple rear end fluid?
I have an Eaton as well . Its been a few years , but I think what I did as add one small bottle of that slip additive and I think royal purple claimed to have that stuff already in it . I broke in the posi with regular fluid then put in royal purple when it was suggested I change it . I like royal purple diff fluid , so much so I wanted some for my trans , but read people say it's no good . oh well
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Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: Royal Purple rear end fluid?
Although I don't have a posi, I still think every diff with a clutch or cone posi system should be using a posi additive. It's always nice to upgrade to a 75w90 synthetic oil while you're at it but the synthetic oil by itself normally isn't good enough for a posi.
Royal Purple does claim that the limited slip additive is already added to their Max Gear synthetic oil so according to them, you shouldn't have to add any more. Their regular 80w90 oil doesn't have the additive.
I run all Lucas oils in my race car.
Royal Purple does claim that the limited slip additive is already added to their Max Gear synthetic oil so according to them, you shouldn't have to add any more. Their regular 80w90 oil doesn't have the additive.
I run all Lucas oils in my race car.
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