Gen III Hemi TH400 Swap Kit


Rated to 2000 HP and bolts directly to your Gen III Hemi!
These transmissions are assembled in an SFI case with an SFI Mopar specific bellhousing. 
The appropriate SFI flexplate and bolts are also included.

Transmission includes as standard:

  • Billet aluminum direct drum
  • Billet forward clutch hub
  • Heavy duty input and main shaft
  • 36 element sprag
  • Billet aluminum reverse pattern valvebody with transbrake
  • Deep aluminum pan
  • Firewall mount dipstick
  • Transmission fluid
  • Gear ratios – 1st – 2.48,  2nd – 1.48, 3rd – 1.1 
  • Close ratio planetary optional (contact us)
  • SFI flex plate
  • SFI Reid case
  • SFI Reid bell housing
  • Custom converter (10″ Blower converter standard)
  • Converter and flex plate bolts
  • Custom converter options available (9.5″ 10″, bolt together, turbo or blower – contact us)

*Freight NOT included. We will contact you when the transmission is ready to ship for shipping costs.

Note: OST Dyno also offers programming, wiring and tuning support for swapping a TH400 into your late model Mopar (Hellcat, Scat Pack etc.)



Take advantage of our TH400 conversion experience and choose the optional components listed below in “Suggested Items” to significantly reduce the effort required to complete this conversion. 

Starter pocket note: Gen3 cars will use dual starter bell. Note that some Gen3 cars have the starter on the left side of the engine. All M6 Gen3 cars have the starter on the right side of the engine. The new style starter mounting on the dual pocket bell housing is for an M6 on the right side of the engine. If your car has the starter on the left side you will either need to convert to an old style starter or buy a right mounted starter and lengthen the power and bendix wires.




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