02/24/2026
4 speed automatic transmission swaps are a thing of the past with your standard small block, big block swaps. If you’re stuck with your built and heavily accessorized Ford, Mopar or Chevy engine has a solution for a 6 speed automatic swap. Whether your ride is equipped with a Stealth 4BBL or MPFI Terminator X Max we can retrofit a modern transmission behind it. The reliability, smooth shifting, increased mpg and updated performance will modernize your classic. Space constraints within the factory floor pan will allow the 6L80/6L90 transmission swap with no modifications in specific models only. Otherwise you’ll have to cut and fabricate a new tunnel.