Best Penetrant to Remove Differential U-Bolts?

dibbons said
Going to remove the rear end from the '65 Formula S in order to tip it on its side and paint the bottom floorboard. I hear PB Blaster is good (don't know if it's sold in stores around here). Any other recommendations? Thank you.

Demonic said
Any the above. PB Blaster, Liquid Wrench, or Kroil. Then time, and patience. Brush the exposed threads with a small wire brush first. Allow the penetrant to soak for a day. When you put your socket on ti, try tightening first but only 1/16 of a turn. Then loosen but do not try to remove all at once if it gets so hard to turn it feels like it will break. Work the nut back and forth until it comes off easily.

Some folks just cut and replace all the U bolts, 'cause doing all 8 like this can take some time.

This is the ticket right here, no matter what lube you use.
I use a drill with about a 3 inch round wire brush to clean the threads before removing the nuts.
Note that I just did three cars of U bolts and they all came off easy with cleaned threads.
Didn't break or trash threads on any of them.