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The one reason they never used low band apply years ago is because it gives a fast 1-2 shift without low band apply. But if you do a burnout in first without low band apply it can hurt the trans. You dont want to get on and off the gas with no low band apply in first. The down fall of low band apply is that if the low-reverse band does not release quick enough (before the kickdown band applies) you can get shift overlap which can slow you down from the 2 elements fighting each other which will cause the trans and eng to drag down some before the low band releases and the kickdown band applies. You want the low-reverse band to release before the kickdown band applies to eliminate shift overlap ( 2 elements fightin each other). Its like trying to be in 1st and 2nd gear at the same time. You will still have low without the low band apply as the overrunning clutch (sprag) will hold in low and it is like a mechanical one way clutch that can get damaged from the tires hooking while doing the burnout or going on and off the gas. The low band apply keeps the drum held and dont release in the rearward direction like the overrunning clutch does. Ron