My mach 1 has a 9inch rear with most likely 28 spline axles. Its an open rear and it really sucks when I take it to the strip and have that right rear tire spinning like stupid and the other tire doing nothing. The car of course will be street driven 90% of the time and I will take it to the strip a weekend or two a month to embarass myself. I read the article on FM about 9 inch rears but didn't quite see the information I was looking for (it was 2AM so I could have missed it). Is there a locking rear that I might be able to scavenge from the boneyard? Is there a few years I should be looking for, or is this a futile attempt to find one and I should just get a new one?