One thing to consider is the bending of axle tubes. This was always something Monte Smith pointed out. At high power levels, you can't stop the tubes from bending on a Dana. 9" rears have all sorts of stronger housings and their design makes them easy to brace up real good.
The Dana housing in my car is bent and I'm not at a really high power level so it only takes a heavy stick car with a stiff clutch and medium traction to bend one.
There are some guys that brace them with tubes and heims like the 8.8 Ford guys do.
I'm not sure the back brace tubes do any thing with the Ultimate 60 covers have but it looks cool
Gus
