what are my options for 6.4 truck engine and auto trans in a 70 challenger swap? we were thinking NAG1 but seems too costly and complicated at this point.Im assuming a plain old SB727 would be the easiest but would really like an OD gear.......A518 maybe? appreciate any advice thnx!!

727 with a gear vendor would be your best bet for an overdrive without hacking on the car much. A 518 auto would be nice but it requires some tunnel work.

i am ok with small amount of tunnel work fyi...

A 518 will fit an e-body without too much work as the crossmember is back further than a b-body( they need the t-bar crossmember modified). There are build threads if you google.

518 will bolt right up =, minimal mods. call pro trans in lancaster ca.

we actually just picked up a 46rh from a 94 ram 2wd so thats our plan now (same as 518 right?) just need to learn about how to operate the od and converter lockup....

The '518' is just the original designation for the 727 based OD transmission. There are a few good how-to's out there to make it work depending upon how automated or manually controlled you want to go.

Pro Trans is finishing a move to Waco TX, look at Facebook for their new phone number.

The best in racing transmissions, I would assume the street transmissions would be first class as well.

A518 should be the easiest to install. There 46RH version can be used with 2 pressure switches and 2 timers.