Chevrolet Performance LS Swap 6-Bolt Crankshaft Adapter For Early Non-LS Auto Trans

This 6-bolt crankshaft adapter (12563532) from Chevrolet Performance makes your LS engine swap project simpler and more compatible. It’s engineered to mate Gen III and Gen IV LS engines to early GM automatic transmissions. This adapter ensures proper alignment and operation with an 11.5" bolt circle that matches traditional converter patterns. The adapter installs cleanly and allows you to retain your existing transmission while upgrading to modern LS power.

Features and Benefits:
- Compatible with early GM automatics
- Fits Gen III and Gen IV LS engines
- Works with TH350/TH400/700R4/4L60/4L60-E/4L85-E
- 11.5” bolt circle
- Ensures proper converter alignment
- Use with bolt kit P/N: 19257940k
- Ideal for LS swaps in classic builds

Vehicle Fitment:
- 1964-1972 Chevy Chevelle/El Caminos
- 1964-1972 Pontiac GTO/Lemans/Tempests
- 1964-1972 Buick Skylark/GS/Special/Sportwagons
- 1964-1972 Oldsmobile Cutlass/442/F-85/Vista Cruisers
- 1971-1972 GMC Sprints
- 1964-1969 Beaumonts
- 1967-1981 Chevy Camaros
- 1967-1981 Pontiac Firebirds
- 1968-1974 Chevy Novas
- 1971-1974 Pontiac Venturas
- 1973-1974 Oldsmobile Omegas
- 1973-1975 Buick Apollos
- 1970-1972 Chevy Monte Carlos