I think the lock/unlock is from the trans having a pwm control for lockup. The pwm control is supposed to make the car ride and shift comfortably. So it gets confused with light or no gas and doesnt create a set pressure to stay in lockup or stay in 3rd. From what Ive been reading, the pwm control can be tuned out so you are either in lockup or in 3rd.
Staying in D wont hurt anything, you just wont or shouldnt go into lockup. No lockup = no pwm control = no clunking. I think D also increases the part throttle shift points.
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1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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