I sand blasted the cover for the rear axle over the weekend and saw a 7 stamped on the cover, I think you can't see the stamping unless the cover is very near new looking, Also Nick was talking about how to determine ratios by rotating things, don't forget that on an open diff this method only works when one wheel can't rotate. Armand >Which differential ratio do you have? Ken Ames <ameskg@xxxxxxxxx> said: week, I spent ten minutes looking for a stamped code on the rear axle, but I'll be danged if I can find it. I even scraped off the grime and paint with a razon on those small bosses where I would have expected a stamping. No joy. I would assume it's a 3.15 or 3.54, although as I recall the 3.54 was more likely found on 343/390 cars. _______________________________________________ AMC-list mailing list AMC-list@xxxxxxxxxxxxxxxxx http://list.amc-list.com/listinfo.cgi/amc-list-amc-list.com