Good question. We did have a kit to the 4.0L version of the NSG for a time period. I really liked the kit. It was not a great mover… and as you've correctly stated, the 3.8L version of the NSG has a whole different and much smaller front bellhousing / case half.
Sadly Mopar / Benz kept the 4.0L version (#5159143AA) in short supply and discontinued it as fast as they could.
We've considered making an adapter to the JK version but it will require a special stepped flywheel - possible but not an easy product.
Is this making sense?
