The Toyota 4Runner Transfer Case Seal is a small lip style ring that locks transmission lubricant inside the transfer case so the gears stay cool, quiet, and damage free. A leaking Transfer Case Seal on any Toyota 4Runner should never be ignored because oil loss rapidly lowers fluid level, heat builds, and gears or bearings can suffer rapid wear. The seal accomplishes its job by gripping the rotating output shaft with a flexible elastomer lip backed by a spring, while the metal outer shell presses firmly into the case housing to block any escape path. Over the years two main seal variations have appeared, an earlier single lip design and a later dual lip version, with the second adding an extra wiping edge that shields the primary lip from dirt and offers a tighter hold on fluid, yet both styles fit the same bore and shaft. When a leak develops owners can jack the truck up, mark and detach the driveshaft yoke, pry the old ring out, clean the bore, grease a fresh Transfer Case Seal, tap it flush, then slide the yoke back in and secure the clips and bolts, restoring a dry undercarriage. Choose a quality Transfer Case Seal during replacement. Regular inspection of the Transfer Case Seal on a Toyota 4Runner keeps costs low.
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