The 4:10s would probably be a little higher RPM than I would feel comfortable with. I think I'm going to put the lower gear set in my spare 904 and get a better converter. Then if I need more gear than the 3:23 set I might swap to the 3.55. The overdrive would be nice but I don't feel like fabricating a mount and all the other issues with fitting everything in the car. I wold rather rebuild the spare 904 and install the gear set then just slip everything in place. Easy peasy and no headache. I'm tired of headaches...