The fourth-generation F-body is equipped with GM's 7.5-inch 10-bolt rear axle. It uses a rubber lip-type seal to keep gear lube from slipping past the pinion flange during normal operation.

How do you replace a seal and stop the leak once and for all. And—what else do you need to know about rear axle seal replacement while you're in there?

Car Craft expert Rocky Rotella shows you how to replace a leaky rear oil seal on an LS1 in a 1999 Trans Am. The right tools make it easy.

Other times luck runs thin, and the dreaded phrase rear main or axle seal surfaces. The seals that keep oil from escaping past a spinning axle or engine crankshaft are of the same circular variety.

If oil isn’t dripping from beneath your Jeep TJ’s inline-six, it’s because it’s either brand new or the rear main seal has been replaced within the last 40,000 miles. That’s just a fact ...