Stock planetaries? You need steel.
The stock Dana axles will take a lot of abuse. If I'm not mistaken, Jim Pranis had stock Dana axles in his 8 sec 3900 lb '68 hemi charger for a while. Personally, I'd rather see some good aftermarket axles and 5/8" studs.
If you do get good axles, don't waste money on 1/2" studs. Go 5/8" and be done. You won't regret it.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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