If you have 4.10s you will need over drive. That leaves out the Muncie. The Saginaw is the old school approach. The T5 is newer. A T5 may be the best way for you to go because the parts are easier to find. The solenoid that fits the Saginaw is hard to find and expensive. Maybe half the cost of a T5. There are some posts on this site about using then behind 250s. It takes some work but it isn't too hard. Here is some Borg OD info. Beater Borg OD
"I wonder if God created man because he was disappointed in the monkey?" Mark Twain
