I swapped the entire unit from another barracuda so I'm not sure what springs they are. There are lots of threads here about different brands and part number of springs. The important thing is to make sure your pinion angle is correct when you mount the housing on the spring perches. Lots of discussion on here about pinion angle also.
Great idea of soaking the nuts...it will help for sure. You'll love the 3:55. That's what I went to and except for the long highway drives, I love them.
