The 199 used 12 counterweights and was made of cast pearlitic malleable iron. A steel crankshaft is rumored to exist (and would be very rare), but is supposedly stronger, and has been reported as the crank used in Barney Navarro's 640 HP turbocharged 199 Indy car engine. It is very doubtfull that a steel crankshaft was ever made, due to the original 232 engine design being based on a iron crankshaft. All 199 crankshafts use a 3.000" stroke.

A plethora of 232 cranks have been used. All are made from pearlitic malleable iron, and use a 3.500" stroke. The original 232 crankshaft was designed with 4 counterweights, and met all design requirements, but was produced with 8 counterweights in an effort to increase engine smoothness. I believe the crankshafts were changed to a 12 counterweight design shortly after the engine's introduction in order to increase smoothness further. No steel crankshafts were produced; the design concept of the 232 was based on a cast iron crankshaft as a means of reducing cost.

The 258 cranks come in two basic varieties: standard and lightweight. The standard cranks were used from 1971 to 1981 and use 12 counterweights. The lightweight cranks were used from 1982 on and use only 8 counterweights. Although heavier, the 12 counterweight cranks have been proven stronger with countless hours of SCCA car testing. The early 258 crank was designed for use with the Borg Warner automatic, and requires an adapter to be used with a Torqueflite automatic. The 258 crankshafts use a 3.895" stroke.

All 4.0L crankshafts utilize the same main journal and rod journal sizes as the AMC crankshafts. All 4.0L cranks are nodular iron, and use only 8 counterweights. The stroke used in the 4.0L engine is 3.44".

MODEL YEAR  ENGINE   PART #   CASTING #    NOTES                         
  1965       199    ???????    3172216     For Borg Warner automatic
  1965-66    199    3173430    3173429     For Borg Warner automatic
  1967       199    3208626    3173429     For Borg Warner automatic
  1968-70    199    3208793    3173429     For Borg Warner automatic

  1964       232    ???????    3160035     8 Counterweights, for Borg Warner auto
  1964-65    232    3172217    3172218     For Borg Warner automatic
  1966       232    3207019    3172218     For Borg Warner automatic
  1967       232    3208627    3172218     For Borg Warner automatic
  1968-71    232    3208794    3172218     For Borg Warner automatic
  1972-74    232    8120507    3214722     For Torqueflite automatic
  1975-79    232    8125449    3214722     For Torqueflite automatic

  1971       258    4488665    3199738     For Borg Warner automatic
  1972-74    258    8120508    3214723     For Torqueflite automatic
  1975-79    258    8125450    3214723     For Torqueflite automatic
  1980       258    8132619    3214723     For Torqueflite automatic
  1981-86    258    ???????    3235477     Lightweight (10 counterweights) crank
  1987-88    258    83503326   unknown     Lightweight (10 counterweights) crank

  1987-90    4.0L   83503409   unknown     
  1991       4.0L   83507107   unknown     
  1992       4.0L   4638952    unknown     
  1993-96    4.0L   4728882    unknown    
  1997       4.0L   4864726    unknown    

Part numbers listed starting with 81XXXXX are assembly numbers, and are presumed to include bearings. Other part numbers may represent either original part numbers, superceded part numbers, or both. Casting numbers are visible on the crankshaft. Casting numbers and part numbers may or may not be the same from year to year.