Larry, 25 years ago I had the same issue with one keeper on a 46 3/4t. After a week I gave up, pulled the axel and had the keeper pressed out at a machine shop. Cost me $10.00. I didn't have a torch, so i soaked the U-bolts in paper cups with tranny fluid for a few days, borrowed a 3/4 drive rachet with a 3' pipe on it and got everything off and 2 the machine shop.
Good Luck!
