Just to close this thread, I opened the 8.8 ford and there i saw i air locker, i have nothing to do with that so i returned the thing.
Now have a 9 inch ford out of 74 bronco. Here in Iceland i talked to several guys, and it seems that the 9 inch has many advantages over the 8.8 one of them ofcourse being that its simpler to weld brackets on, and other things like its easier to tune in a new gear, and if wheel bearings go bad, it often destroys the axles, but not in the 9 inch. although the 8.8 and 9 are similar in size it seems that the tooth´s on the 9 inch are shaped so they can handle more force.
I don´t know, but i´m happy to have the top gun in my garage.
Tomas
p.s. i´ll maybe post pics when done.