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Originally Posted by foff667
fwiw when i rescaled for 4.10's the computer says it should be shifting at ~86mph which i think worked out to ~5200 in kasey's car...once he gets dynoed we can see where his peak hp is & determine where we should set the 3-4 shift to occur. He was trapping at ~92mph in the 1/4 and we'd prefer not to have his car shift into od before the traps.
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Out of curiosity, why can't he put the shifter in "D" instead of "OD" at the track? I used to do that with my '96 Impala SS. As long as it doesn't hit the rev limiter, it shouldn't shift into the next gear, right?
Another question, is he running taller slicks at the track? When I had 3.73s and the auto in the Monte (stock 26" tall tires), I used to shift around 5K rpms, and would have to shift into OD just before the traps (otherwise she woulda been screaming). With the 4.10s and stock tires, is there enough room on the track to leave it in 3rd assuming a 5200rpm shift point? He might cross the finish line a bit higher.