90 series and 120 series Rear diff, differences??

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melbourne australia
ok so i have somehow worn the bearing race surface of my rear axles to the point where i cant put new bearings on because they are undersize. so long story short, i need new axles! not cheap from Toyota so id rather go aftermarket which are slightly cheaper and supposedly better chrome molly. ive been thinking Nitro shafts, the don't however make/list a set for the 90 series but do list for 120 and 150 series. both there listings state that they are 30 spline shafts which i know is the same as what i have but i need to know if anyone knows if i can use the 120 or 150 series shafts in my diff, and what are the differences if any. i would hope that they'd be mostly the same as the 90....
 
120 series have disk brakes instead of drums. Sorry I can't be of more help.
 
From memory 1.2 or 1.5 liter/quart. Just fill to the bottom of the fill hole. Maybe that's the xfer case and the axle is 2.5.
 
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