ape:
I have done my 46. It isn't that hard. It's a lot of work, but not that difficult to change out those gears yourself. When I started my truck I knew nothing about turnning a wrench except maybe a basic tune-up. Take your time read the instructions that Patrick sent you, and the shop manual for your truck.
You can do this. There are a lot of helpfull guys here ready to answer any questions you have. Give it a try, you'll be glad you did.
Good Luck
George
