I switched over to the RedLine D4 ATF in the Tremec TR6060 trans. The OP is spot on with his review. I *instantly* noticed an improvement.
Most of the nibble/notchy shifts were gone. Cold start use was 90%+ better in smoothness and ease of shifting.
I don't know if this fluid change will impact the 2nd to 3rd gear brick wall issue I have every so often at 5k-6k rpm shifts but time will tell.
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What' the part number for the trans fluid?
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Red Line 30504 D4 Automatic Transmission Fluid