Removing rusted driveshaft bolts

[Shorty]

I have just got the full rear axle from a sierra gt with rear disc brakes and bolt on driveshafts but having trouble removing the bolts from the driveshafts as very rusted.
Ive tried giving them a quick clean up to remove the thick of the rust but they are very tight and having trouble getting a good grip with the torx bit(40 or 45 I think it was)
Any ideas? heat or grind off are the first methods that come to mind but don't want to do any damage.

[K4KEV]

heat cool quickly,repeat repeat repeat repeat etc until they give

[mopple]

Cold chisel and big hammer is an option. Bash the bolt heads CCW from the middle of the head until they undo.

[robo]

Originally Posted by mopple

Cold chisel and big hammer is an option. Bash the bolt heads CCW from the middle of the head until they undo.

As above but its a shitbag to work on rolling it around on the floor. If your still having grief those 1mm thick cutting discs for the small grinder would cut all those heads off without hurting anything else.

bob

[ozzy1]

Give it a good soaking of wd40 for a day or 2 then use the heat method

[rapidtornado]

Tried for a week to get them off my drive shafts... in the end just ground them off... think I went through 5 torx bits and a torx driver