Suddenly lost first reverse third and fourth and had to slip the clutch a lot to get home in traffic.Checked the linkage and found a loose nut in a slot at the end of one cable.Assume this is adjustable to allow for cable stretch but just tightened near one end of the slot and all gears are back!!.At 168k miles and box is a bit notchysometimes I thought this was scrappage time so lets see how much more time she has got left.Engine is still sweet and strong but thirsty as usual