Check your base timing. it should be at 6* BTDC. 7 is ok too, as long as its 6 or 7.
I doubt the trans is slipping because then the engine would freely spin without the car going anywhere and you would definatly eclipse 3k RPM.
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Formerly known as blk95formula
86t/a_ram_air on TGO
2018 Silverado 1500
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