Red loctite and as tight as I can get em with a box end wrench. Surprised you fellas can't loosen bolts that have had red loctite on em, just a quick hit w/ your hand on the wrench and they start to move for me...although they are stubborn. CHIP

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