When going downhill in high gear, after about 5 to 10 seconds of coasting, the trans comes out of high gear and the engine freewheels. Once I slow down enough on level ground the gears start to grind and re-engage into high. Also get grinding if I try to accelerate before I slow down. Originally, I had noticed it would not always engage low gear every time. Cable has been adjusted about 1/8" now and low gear engagement has not been a problem, SO FAR. Still goes into park, reverse, neutral, high and low without issue. The coasting concern has not seemed to change. Old guy, no hair left to pull out. Anybody have some techy info for me?