Best Penetrant to Remove Differential U-Bolts?

Cope said

Mine are torqued to what ever the manufacturer said when i bought them.

Im jist saying if i wanted to put the impact on the nut i think it would crush the 1/4" thick tube before the U bolt broke.

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I get what you're saying.....but the manufacturer of those U bolts doesn't know that 45 LB FT is the designated torque spec for Mopar leaf springs. Over torquing them will result in the springs not working properly. They will bind and not allow the suspension to work.