What automatic transmission fits a 1997 Chevrolet 1500 truck?
The 4L80E, Allison 1000, and 6L80E can be swapped in, but it
will not be a drop in swap... you would need to do a lot of
re-pinning, have the engine ECM reflashed, etc. If you want a drop
in replacement, 4L60E is your only option.