Correct me if I`m wrong but if you put it in first gear with an automatic , mash the throttle and throw it into 2nd at say 4500-5000 rpm the trannys not gonna upshift until the motors around 5900-6000 rpm. That`s about where it shfts if you were to put it in drive and let it shift its self manually. I`m almost positive that`s how my truck shifts when I`m manually throwing the shifter at full throttle.OkieScot said:I am not a mechanic nor a drag racer, but it doesn't look like it would matter unless you
went far enough and fast enough to shift from 4th into 5th. On the other hand if you
are good at shifting it looks like you would be faster if you manually shifted the transmission through the gears.
I am sure that the automatic would be short shifting you, thus losing a little bit of peak
power in each gear. and at a point if you needed the overdrive you could activate it then. That is assuming it does not hurt to activate the overdrive at high rpm's.
Maybe someone who really knows will chime in on this for you.