A833 Tail shaft

BTW, if you have a short-period cam in a 318 or a 360, the overdrive unit is a pretty good deal. You can regear the rear end to maintain a cruise rpm in the range of 2200 to 2400, and get a dynomite starter gear. Or, like I did, you can put Second gear wherever you need it to be.
The only caveat with that trans, besides the wide ratios, is the rather weak M/S od gear. You always have to keep in mind that the A833od is a 3+1 trans, and be kind to the od.
I had thoughts on putting the 4 speed behind my 340, car has 3:91 gears. I was told the OD unit would be terrible for such a combination.