Re: OD for 39 Six

Posted by Packard Don On 2016/3/19 13:17:27

This is all fascinating to me as I used to drive my 1940 110 at highway speeds without overdrive and even drove it from Bellevue, WA to San Jose, CA following the family in a more modern car when I moved back to California in early 1972. I would have preferred the lower revs with OD and finally installed a unit but never drove the car with it connected and working. I had the driveshaft shortened by a local shop that specialized in driveshafts.

That said, I'm not sure if it applies to 1939 but on the later cars the models with factory OD had a different ratio rear end too as a little lower one was possible with OD for better off-the-line acceleration rather than the "compromise" ratio used without OD to try to keep the high-end revs down to a more reasonable level.

Incidentally, I have R6 and R9 kick-down switches should you need one.