This is my daily driver. Bought it with 141k. Currently has 183k, and hasn't missed a beat until recently. Sometimes when sitting completely still I will shift from neutral to 1st, and it will grind. At 1st I thought it was me, but after about 3 more times I knew something was up. When I got the truck I immediately changed trans fluid ,and went with Amsoil MTG GL4 75w90. Recently changed fluid less than a 1000 miles ago using the same fluid. To attempt to cure the problem I installed a new clutch Slave, and Master cylinder this wknd. Drove about 95 miles ,and sure enough it did it again tonight. Clutch does not slip at all in any gear, but it is possible it could be causing my problem right? Thanks for any feedback.