[Jeff H]

The JL8 rear axle codes begin with "Q" so that does have some meaning. My car has the 3.73 rear which is the "QX" code. The GM crossram was an over the counter option so saying "dealer installed" doesn't really mean much since it wouldn't be original to the car. There are several aftermarket crossram's(Offenhauser, Edelbrock) with the Offy being very similar to the GM but with obvious differences. My car will probably be for sale some day, but right now it's still in the middle of the restoration. I've got the original protect-o-plate and broadcast sheet with it as well as matching #'s. One other thing, GM made some fiberglass crossram cowl induction hoods(less than 100) and I thought that yellow car had one of the GM hoods like I have. That will increase the value as well.