My trans has the TF2 shift kit. I simply set the line lock, pull the trans into drive, give it a moment to make sure it's engaged in gear, then start the wheels turning. You just need to be sure you get the r's up fast enough to keep em turning when the trans upshifts. I drive out of the water with the trans in high gear. Please bear in mind that my car does not have a ton of power, so I'm not putting much stress on any driveline/trans parts.