31 spline will hold that and then some!! no need for 35's IMO. just added weight for nothing. and with 31 splines you can run a smaller 2.89 bearing and save a bit more. or even run a 3.06 case either way its cheap. as a 35 spline spool or carrier wont fit a 3.06 or a 2.89 case. and the ones that do i wouldnt use. the bearing race surface will be rather thing. if i were to run 35 splines id get a strange 3.25 case and build from there but wen you doen with a good posi or locker your looking at $700 Plus and for not a shit ton added strength for what your gunna use it for.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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