This rear main seal is designed for GM Gen III and Gen IV LS engines and replaces the factory rear main seal to provide a reliable, oil-tight seal at the crankshaft’s rear snout exiting the block. It is intended for use during engine rebuilds, crankshaft removal/installation, or whenever the rear cover is serviced to restore proper oil containment and prevent leaks into the transmission bellhousing or under the vehicle.

Brian Tooley Racing BTR60436 Features:

• Fitment: GM Gen III and Gen IV LS-series engines
• One-piece rear crankshaft seal construction for secure, leak-resistant sealing
• Prevents oil leaks at rear main bearing area and maintains crankcase integrity
• Direct-fit replacement for OEM rear main seal (replaces GM 89060436)
• Suitable for stock engines, rebuilds, and performance builds — including high-RPM or boosted applications
• Sold individually — one seal per engine rear-main application

Brian Tooley Racing BTR60436 Notes:

• Sold individually — order one per rear-main seal installation
• Recommended replacement whenever rear main cover is removed or during full engine teardown to ensure a leak-free rear crank seal
• Proper installation alignment and surface preparation recommended to maintain seal effectiveness