and therefore a couple of different Bearing sizes, Axle Sizes, Backing Plate/ Drum Sizes....
my hand is up now, only after pulling the diff out of the white one to put the locker in it yesty
i was gonna just change the whole drum assembly over to the locker (cos it had no brakes at all on it)
so i pulls the locker apart, cleaned up the housing, painted it all up nice... pulls the std diff apart, goes to fit the backing plates up, and see that the mount flange for it, is bout 15mm thick on the std diff and bout 6mm on the locker..
didnt think much of it at the time, until i have the axles sitting side by side and notice the std ones were a bit thicker than the axle from the locker... hmmm strange... measured the spline, yep same, goes to put axle in, and then notices that the bearing is about 10mm bigger than the other one :?
so, it became pull the locker centre out, fit in the other housing, and reassemble the original housing and put it back under the galant with the locked centre... and after all that, i couldnt really be fucked cleaning another housing and painting it lol so it went back in with 30 years of road grime and shit all over it still
so yeah, i have never seen any differences in them before, until yesty.. i have just been lucky i guess, all my spare axles are the small bearing, so now i gotta hunt a couple more big bearing axles, cos im pretty sure they wont last long at powercruise
anyone else came across the same sorta problem? - might be a difference between a GC diff and a GD diff? cos i know the locker was oringinally out of a GC (many moons ago, when jasons 8 second rotor galant, was running a std 2.6
)
as far as i now between gc/d the only differences is between wag and sedan diffs. wags obviously have bigger drums,a and they are slightly longer in housing width, the axels are dirrent in diameter, bearing size, and lenght. but as far as i know all the diff centers interchange. 
