Product Description
Genuine GM Chevrolet 12563532 LS Crankshaft Flange Spacer
Adapts Pre-1997 TH350, TH400, 700R4, 4L60 & 4L65 Transmissions to GM LS Engines
The Genuine GM 12563532 LS Crankshaft Flange Spacer is required when adapting earlier non-LS automatic transmissions to modern GM LS-based engines. This OEM spacer installs between the crankshaft flange and torque converter to provide the correct converter spacing and engagement depth, preventing transmission pump damage and driveline issues. Designed for swap applications using TH350, TH400, 700R4, 4L60, and 4L65 transmissions, this spacer ensures proper torque converter clearance and reliable operation when mating older transmissions to LS engines.
Key Features & Benefits
- Ensures Proper Torque Converter Clearance: Correctly spaces the torque converter when installing pre-LS transmissions behind LS engines, preventing pump damage and premature transmission failure.
- OEM GM Fitment & Reliability: Genuine GM component engineered to factory specifications for accurate thickness, strength, and long-term durability in swap applications.
- Supports Common LS Swap Transmissions: Designed for use with TH350, TH400, 700R4, 4L60, and 4L65 transmissions commonly used in LS engine conversions.
- Compatible with Most LS Engine Variants: Works with 4.8L, 5.3L, 5.7L, 6.0L, and 6.2L LS engines, excluding specific applications noted below.
- Recommended Upgraded Fasteners: Requires longer crank bolts; ARP 244-2902 bolt kit is recommended for proper length, increased strength, and cost savings over OEM bolts.
Key Fitments
- Compatible Engines: GM LS-based engines 4.8L, 5.3L, 5.7L, 6.0L, and 6.2L
- Compatible Transmissions: TH350, TH400, 700R4, 4L60, and 4L65 (Pre-1997 designs)
- Not Compatible With: 1999–2000 6.0L engines (longer crank flange), LSA, and LS9 engines
Important Notes: Longer crankshaft bolts are required for installation. ARP 244-2902 bolts are recommended for proper length and increased strength. This spacer will not fit 1999–2000 6.0L engines due to their longer crankshaft flange.
