I have a 2005 Granite with the t310mlr trans. When I first got it the synchronizers from low to high went out. Then the high to low went out. Then trans cooler started dumping anitfreeze in trans. Trans grinding again. Changed fluid and put synthetic in and it helped, but got progressively worse. Now it wont even pull on the high side. Everyone has told me to not let drivers preselect ranges. That they should put in neutral then change range. It says on sticker in cab to pre select. Some say it is caused from shifting from forward to reverse with truck still moving. Salesman says that is case. He says everytime they have corporate meeting people are complaining about this trans. 5500 for reman trans or 4200 to fix. Im sick of this transmission. ive been looking at a swap. I have found eaton 10c and 8ll. Was told if I put 10c in I would kill resale value. I dont know what to do. Any ideas. Thanks