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If the RP is designed to have a higher film strength then it very well may be just fine for your transmission. I work in the gearing industry and you can see large gains from changing oil specs. I'll admit I'm no expert, but if RP recommends it I'd be fairly secure that it'll work alright. If you are very unsure, use a magnetic drain plug, or drain the oil out in a few thousand miles and run a magnet through it. If you see metalic particles there is obviously wear going on. Keep in mind they may be remainders from the first oil change that weren't flushed out initially though.
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