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Well i did my manual a4L80E over a year ago and 5000miles runs good and shift very firm much better than the 3l80 ever did ,and yes it uses a vacuum pump for increasing shift press, i'm not affraid and pull my M103A2 trailer several times, but like the previus thread put in in D hit the gas yes...

I have a manual 4l80E in my HMMWV and yes you have to shift up and down as needed and lock the converter on a switch i mainly only use the OD over 45MHP snd the lock up over 55MPH , the kit i use was trans-g0, using stock valve body however TCI or GM performance {both the same} make a stand...