Royal Purple gear oil

[stangboy]

If I'm using Royal Purple gear oil in my rearend do I need the friction modifier? Royal Purple claims to already have friction modifier in their gear oil. LMR sells RP gear oil with a bottle of friction modifier. I always wondered why if RP already has friction modifier in it already. Is there something I'm not getting here?

 

[srtthis]

it has it but some people still like to add it. doesnt hurt anything by adding it

 

[Riverart]

i added both to my ride.

 

[stangboy]

Ok then I guess I'll add it just for good measure.

 

[srtthis]

im kinda curious to know if there is any advantage to adding it with my spool... id like to try and make things spin as freely as i can

 

[90lxcoupe]

Ive read some not so stellar reports on RP gear oil. I switched to amsoil in that and in my old truck, when i had the rear rebuilt from ford, it would chatter like crazy around corners. I swapped that to amsoil also, and the chattering went away 100%

When i had a posi, i always put two containers of friction modifier in with the oil.

Id use amsoil, mobil1, or redline. All three of these brands did well in the analysis that i read.