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The T1s with the ATX or ZR2 packages have front lockers. 99.9% of the time they are not necessary. Our factory front differentials are not sturdy enough according to GM to use them in those cases. However, I think Chrysler/Dodge/Ram used them in the 9.25" front differential which GM also uses and those too are made by AAM.Who has a locking front diff? What brand is it? And how do you like it?