The Enginetech SK5671 is a 1-piece ptfe rear main seal kit engineered as a stock replacement for 1997-2020 Buick, Cadillac, Chevrolet, GMC and more engine applications.
Important Notes
- 1-Piece design: verify your engine uses a 1-piece seal before ordering - 1-piece and 2-piece seals are not interchangeable.
- Kit contents: includes housing gasket for a complete rear-main rebuild.
- PTFE construction: low-friction sealing for long-cycle durability.
Specifications
| Brand | Enginetech |
| Part Number | SK5671 |
| Product Type | Rear Main Seal Kit |
| Design | 1-Piece |
| Material | PTFE |
| Kit Contents | Housing gasket |
| Country of Origin | United States |
| OEM / Aftermarket Cross References | FEL-PRO:BS40640, Victor Reinz:JV1657, DNJ:RM3165 |
Vehicle Fitment
- Years: 1997-2020
- Makes: Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, Pontiac, Saab
- Models: 9-7x, Ascender, Avalanche, Avalanche 1500, CTS, Camaro, Canyon, Caprice, Colorado, Corvette, Envoy, Envoy XL, Envoy XUV, Escalade, Escalade ESV, Escalade EXT, Express 1500, Express 2500, Express 3500, Express 4500, Firebird, G8, GTO, H2, NPR, and more
The rear main seal (also called the crankshaft rear seal) prevents engine oil from leaking between the back of the crankshaft and the transmission bell housing. Over miles and heat cycles, the seal hardens, cracks, or takes a permanent compression set - producing the characteristic oil drip at the bell housing and, if left unchecked, oil contamination of the clutch disc or flex plate. Replacing the rear main seal during a transmission service or engine rebuild restores the final oil seal between the crankshaft and drivetrain, preventing slow leaks and protecting the clutch and flywheel from contamination.
