I have a Detroit Locker that I put into a 8 3/4 742 case. The Locker was used when I bought it and I have been running it on the street since 2002. I have never had any problems with the diff after 10,000 street miles.

An occasional rachet or clunk from the diff when it disengages and reengages around corners. Also no abnormal ring and pinion wear. No abnormal axle shaft spline wear.

Don't expect to take corners fast, its a Locker diff, not a clutch/cone type posi.

I recommend it for street use.