If the aluminum center section is listed as a Stock class contingency item, it should indicate that it is legal for use in Stock. It is legal in IHRA and I've been using it for almost 2 seasons. I thought I would be hearing some noise and possibly replacing the ring & pinion by now, but it seems to be holding up rather well. I've only had high 1.40 60' times, usually 1.50-1.51, but I have to weigh 3,530+ lbs.
On a similar note, the Moser 8 3/4 housing has been approved by NHRA for Stock!
http://www.dragracingonline.com/agen...0-xi_4-56.html