1973 Dart Magnum Swap

I decided against using a big, less efficient Mopar overdrive in my 5.9 swap, and went with a smaller more efficient modified 200R4. Either way still requires significant torsion bar crossmember mods, but with the 200R4, you can leave the floor pan alone.

There are some kits for this crossmember available from places like US Cartool and others that make the swap a bit easier. There is also a company that drops the rear of the transmission so much that a 518 will bolt-in, but it has to wreck havoc on the drive line angles.

The harness has a lot of wires that will be useless for your swap and should be removed. The ECM can be reflashed for significant performance increases.

I spent some time and a bit of money changing the seals, gaskets, valve springs and cam on a junk yard 5.9 long block I ran for a year to get the fuel and wiring set-up in my '68. It ended up having a bad ring pack on the #2 cylinder and would pump only 90 psi, but the rest of them pumped it into the 150psi range. It was fast with a reflashed tune even with the weak cylinder. I had it hooked to a 727 at that time.

I've since upgraded to a fresh 408" motor and 200R4 trans.