Hello, after changing my transmission/rear end fluid, my transmission has started acting up, used shell tractor hydraulic fluid as i read on here is to be used. The tractor works fine when its cold, but after about 45/60 minutes of use the transmission starts to lock up, even stranger, once is begins to act up and the tractor is sitting idling in neutral, it was try to put itself into gear ( grinding noise for about 3 seconds and tires will jump ahead a couple of inches). No one around here will even look at it to work on it and Im at loss if it should just be parked in the hedge or if anyone knows what might be going on. Any info to get me on the right track would be appreciated. Its a 1974 4x4 model with the 8 speed tranny. Thank you