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

Make your LS engine swap simpler and more compatible with this Chevrolet Performance 6-bolt crankshaft adapter (12563532). 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:
- 1960-1987 Chevy C10s
- 1988-1998 Chevy C/K Trucks