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Originally Posted by nitrorocket
.... full power for short periods of time in 4th...
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Read between the lines. That phrase is contrary to a 200mph banzai run. If you're gearing for O.D. you will need to be in 4th for a
good long while. My guess is that shortly after shifting into 4th, the car will begin to shudder from insufficient friction surface. What is your top speed now at 1:1? A 4L80E shares more than 70% of it's parts with a TH400. So you already have a fair performance comparison at your disposal.
p.s.
See? No sarcasm. I was only trying to be straight with you--good news or bad. My customers come to appreciate my brutal honesty. Saves em money and grief in the long run.