We use In-force at the shop as well, Spray it let it soak and Heat it up as hot as you can get it, Douse some gear oil on it, Let it absorb, Heat it up again and take em out!

 

2 other poorman's ideas- brake fluid works sometimes, and start it, let it get warm but not hot enough to start a fire, and hold a candle against it, let it melt and run down the threads, then tap lightly with a small hammer

 

What he said,

or ATF/Acetone mix 50/50

and take it apart hot, soak it, run the hell out of the truck break all bolts then soak again, wait till it cools and take everything out.

 

corrosion x, we use that at work, and if it that dont work we torch them bolts off

 

Heat is the most important it expands the metal pb is good for the cost areo kroil
Is 5 times as much

 

PB is the chit