Quote:
Originally posted by James Scott
I recently put "all" Redline D4 ATF synthetic automatic transmission fluid in my 4eat. A year ago, the dealer thought a shuddering (intermittent) problem (and rough idle) was the AT. So, before recommending a new or rebuild AT, they did a AT fluid transfer, putting in all new Dexron (I had 1/2 Redline synthetic 1/2 Dexron at that time). I thought I heard it's best to have synthetic, so I did a transfer of all AT fluid to Redline synthetic.
I notice more slipping between gears. Is it better to have the slipperier fluid (less friction/wear), or does the increased lubrication and resultant slipping between gears cause MORE wear (or damage)?
THANKS for your input!  
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This is an ETERNAL debate. There are those of us who don't see the need for the added expense of synthetic, IF you keep your fluids fresh. Others swear by synthetics. You'll get mixed reviews.
More slippage means more wear. I think that may be one of the "gremlins" in the SVX tranny. The TCU was tuned to give the SVX a "sport shift" feel, by sending a signal to the necessary solenoid for a long shift (adding a bit of slippage). They wanted to try to emulate a clutch and shift feel. Perhaps this increased slippage along with indadequate cooling is the downfall of the Subaru 4EAT (4-Speed Electronic Automatic Transmission). That's just opinion, based on my limited knowledge.
Perhaps your tranny had a few too many miles on it to begin, midstream, with synthetic. Again, that's just opinion.
I suggest you do what you want, and what makes YOU feel good. Just keep the fluids fresh.