28 spline. You should have better things to worry about as an L plater
1995 Manual HSV Clubsport
Wade Cam :: 9.2:1 CR :: Pacemaker headers :: Twin 2.5" Exhaust :: VT Brakes
1991 Supercharged VN Berlina
9 PSI SC14 Intercooled :: Genie headers :: Twin cats :: HM Twin 2.25 exhaust :: 3.45:1 LSD
i would never use a spool for just street so much nicer to drive with lsd and haven a locked diff can cause understeer when hard cornering
if you put a locker in a stock diff you will destroy it if its a daily. twist axles snap axles prematuer wear on everything including tyres. having said that itts just a borg warner 28 sline. 3.08 gear FYI. id personally just buy a second hand one disk to disk rebuild it with a lsd some gears good bushes when put back in and the car will drive amazing