Thanks for the feedback guys,
I guess I'm hearing that with the stock rear end I would get more torque but couldn't get too far over 50 mph. Hmmm. What to do. Switch it out with a 4.10 or I'll just leave it alone- burn rubber then drive like AARP on the freeway. Oh and thanks for the vote of confidence in keeping the hydramatic- it is a very unique piece of mechanical history.