OK - Originally, I posted and asked if any actually knew for sure if it was possible to exchange 63-64 tapered axles for 65 up flanged axles in my 8 3/4 741 case with 3.23 sure grip. I need to install a 4.10 Sure grip. Do the 63 and 66 Axles have the same axle housings? Can I swap in the complete 66 Axle assembly IF I use the correct length axles?So far, I have learned that:- it IS NOT POSSIBLE as bearings are different- it IS POSSIBLE and a simple swap if all compatible parts are used- Green bearings suck,- Green bearings do not suck- Its easy to replace Wheel Studs,- Its easy to upgrade brake drums,- the spacers in early and late sure grip units are differentSo far no one has offered any advice from personal experience concerning the exchange of tapered axles for flanged axles and what is needed for the swap......Does anyone have an empty 53-64 8 3/4 housings to examine for fitting green or stock adjustable bearings? Are the bearing retainer plates the same between 63-64 and 65 up?