4spd swap checklist for a 68 Dart GT 318/904

JDMopar said
They came in both iron and aluminum, I think. Check the size of the front bearing retainer. The OD trans had bigger retainers. Maybe check the bellhousing you got to see if the 2 mate up snugly.

It’s already together.. came out of a running and driving car. Previous owner went to a 727 trans.