Dont know what trans your truck has, but a place called Novac had the parts for my 47. They have rebuild kits + their website as alot of good info. Hopefully if you punch in Novac it will come up. I did my sm420, first trans I had ever done. 400 miles and appears to be working well. Also check your rear end, if your trans was low maybe the rear end might be too. Mine was out of oil, or atleast it had been at some time or another,Expensive repairs.