Quote: i run a dana for a number of reasons. the dana may weigh slightly more, but has less rotating drag due to the fact that the pinion centerline is closer to the ring gear centerline (vertically). granted there is tons of aftermarket support for the 9", but i just didn't want a ford based rear in my car. that and i've broken a 9". and an 8 3/4. and an 8 1/4. i also agonized over which posi to use. i have a full spool. it was the right decision for me.
This rotating effort/efficiency of rear ends I find exceptionally interesting. I have NEVER seen an actual test, figures, or calculations. As such, I believe that it really doesn't make a difference, a measurable difference. NASCAR guys do everything to extract every bit of power, yet they run a 9". Show me facts, otherwise, I say this is 50 years of bull.....
