I locked mine when it applied the 2-3 shift. Definitely helped it out on the back half of the track. I had a 4L60E built by Rossler with an old Yank SY3500... it flashed closer to 4400-4600 with my engine. (the 3500 rating was figured with a stockish LS1) Was very tight around town, loosened right up as soon as I hung my foot in the throttle.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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