The cheapest sae 3 housing I can find is around $200. So the cost of a 6 speed around $1500 plus the bellhousing puts me at $1700. Whereas this one is $600, that gives me an $1100 buffer to find the parts to make it 4wd. 3925223 3925223 Cummins 6bt or 4bt SAE 3 Flywheel Housing. 3925223 New Aftermarket Cummins 6bt or 4bt SAE 3 Flywheel Housing
SAE 2/4-Bolt-C. : SAE#1 Flywheel Housing with SAE#14 Flywheel. 3 4 Speed BELLHOUSING Toploader T10 or T5 w/Adapter Swap FALCON Early Six 6 Inl. LDI 2198 - Bell Housing, SAE A, 2-Bolt, 4. EXTENDS PTO. 5" flywheel spec, otherwise you will have a very hard time putting any common or easily available marine gear on the back.