rear end lube

[bosted86]

anyone using royal purple for their posi rears? any good?

 

[Stage 5]

Royal Purple

I just put 75-90 im my posi when I put on my TA Girdle, I was running it before too. RP is Awesome! It has all the additives in it. I give two thumbs up!

 

[bosted86]

thanks, thats what i will use.

 

[Dreamcar86]

I just put 75-90 im my posi when I put on my TA Girdle, I was running it before too. RP is Awesome! It has all the additives in it. I give two thumbs up!

I switched to a synthetic several years ago and still wound up having to get GM's additive. Are you running straight Royal Purple without the additive and the clutches are not grinding?

 

[NC87GN]

You do not need to run the additive (friction modifier) with the royal purple synthetic.. Have done this on my car as well as a couple others with no roaring, whining, etc.. I cannot vouch for the other synthetics though..

Mike Banas
87GN

 

[Stage 5]

I switched to a synthetic several years ago and still wound up having to get GM's additive. Are you running straight Royal Purple without the additive and the clutches are not grinding?

When I first changed the oil 1yr ago I used the Gm Additive. But this time I used straight RP. Its running as smooth now as it did before. It doesnt need it and I think is messes with the mixture

 

[my1stgn]

What about running Lucas Synthetic Diff fluid? Im about to put in a new Eaton Posi unit and want to know which fluid to run. Or is Royal Purple that much better?

 

[Lee Thompson]

fluid

What about running Lucas Synthetic Diff fluid? Im about to put in a new Eaton Posi unit and want to know which fluid to run. Or is Royal Purple that much better?

My instructions for my Eaton says to DO NOT use syn. fluid.

 

[Dreamcar86]

My instructions for my Eaton says to DO NOT use syn. fluid.

That is interesting. I wonder what the thinking is behind that?

 

[meanchicken]

My instructions for my Eaton says to DO NOT use syn. fluid.

Same with the Detroit TruTrack in my Camaro's Moser 12-bolt. Says to use non-synthetics only.
But I also don't have to run additives since this diff doesn't use clutches.

 

[Getsidewayz04]

anyone else think the title of this thread is a lil funny?? haha

 

[meanchicken]

anyone else think the title of this thread is a lil funny?? haha

Not me...I was just at the Dr. office last week...still feeling unclean...thanks for reminding me why.

 

[Lee Thompson]

Imo

That is interesting. I wonder what the thinking is behind that?

I assume it has to do with the carbon fiber clutch material.

 

[turbo39151]

I run a basic synthetic (valvoline or castrol)- can't remember. No issues at all.