Scott,
I am using Royal Purple in axels and tranny. When I've changed it ATF was about $5 (Performance store in Bellerica). I can not stress enough what kind of difference is there in using synthetics - very smooth shifting, quite.... the only minus is that it is hard to get Royal Purple. I think next time I'll go with Mobil 1 as it is easier to get here in Boston.
PS Yes it is worth every penny ! Your VX works hard (you are supercharged) so it needs to play hard
Good luck !
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