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I'm surprised with all the 255/3.23 theorists. I got a similiar mild built 360 with 3.55 and 305's and a tighter converter can't keep the rear tires stuck. Something in the OP's tune is off, I don't see a drive train issue, except the 255's are too narrow.



Same here, pretty stock 340, had 3.55s, now have 3.73 and no problems spinning the tires from a dead stop, and still spinning as car is shifted into 2nd.
Auto with RMVB.

Something else going on, gears or TQ isn't your problem.