Have used synthetic in my 68 with no problems. I did add a tube of sure grip additive. --- John and Donna <drjjkoot@xxxx> wrote: > Has anyone used one of the synthetic gear lubes like > the one from MOBIL 1 in the rear end of their > Chrysler? Also, does anyone have any experience in > using this same synthetic gear oil in an older > straight stick transmission (on that originally > speced an EP 90W oil)? Thanks, John in Wisconsin > > > [Non-text portions of this message have been > removed] > > ===== __________________________________ Do you Yahoo!? Protect your identity with Yahoo! Mail AddressGuard http://antispam.yahoo.com/whatsnewfree