O.d.

No Worries,Thanks for the apology. No big deal. I have a 400 block,I have a 71 340 block and forged crank,also have a complete 440. 451/stroked 400 using 440 crank and rods fits A body better. #40,cause I have options. 440 wasn't brought up cause I've built a few and know what they can do. Never used a mopar overdrive 4 spd. I have some regular 4 speeds. Lookin for a less expensive route than a gearvendors,thats all. Never used a mopar overdrive. drove a couple on 318's that others owned. They had round shifters on them that were sloppy. Didn't know if the pistol grip shifter would work on one. Although it sounds irrelevant if the OD won't take the abuse. Researching before spending. When younger I did it the other way around. Little smarter now...

I'm not saying you can't use the OD unit. I beat the crap out of one and couldn't break it. Back then we didn't have bite or horsepower.

IIRC it is in the cluster gear. And I think it had something to do with vibration or something. They are essentially an 833 that uses 3rd gear as an overdrive. I have seen pics of a guys car that used a V-Gate shifter with an OD box. You just flip the 3-4 lever down.
I wish I had one to take apart. Who knows, maybe you could replace the cluster gear bearings with a bushing....Id have to see one.

Maybe you try it and see if you can kill it! Then we would all know for sure!