being in '3' keeps you from shifting into 4th, until you hit a certain speed. some people do it in normal driving so the tranny doesnt do as much work. the same goes for the other numbers, 2 and 1.
i have experimented with these settings, and it is possible to rev the engine higher than if it were in drive, but its a good way to burn tranny fluid. i believe the manual states at what speed the gears will shift, because if you leave it in '1', you can eventually hit 4th on massive acceleration.
something else: if i find myself short of braking room, shifting to 3, 2, or 1 will dramatically reduce your speed. my friends call it stick-o-matic shifting. i call it downshifting.
its even possible to omit braking completely if you have enough space and swap into neutral. remember high revs = heat.
personally i shift into 2 at 20mph, and 1 at 10mph.
side note: another side effect of the 'ebay chip'. ever since installation shifting into 3 puts it in neutral, unless i hit the gas, then it pops back in. if anyone can diagnose this as a different problem please do. my gears arent showing any problems otherwise.
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