The A833 has a 3.09:1 first gear, which is pretty much what you want for hauling a trailer from a standing start. Fairly wide steps in the gears from there, 1.67:1 second gear and then 1:1 third, it's very much like an ordinary 3-speed box.
As an alternative, a direct top gear A833 from an A-body has that same 3.09:1 first gear, then it has a 1.9~:1 second and a 1.4~:1 third and direct top gear. This might be a better combination when towing and give you greater flexibility while you lose the overdrive top gear, which you might not use a lot while towing.
I think your '66 Valiant still had the ball & trunnion driveshaft originally. This would have gone by the board when the overdrive A833 was fitted as they always had slip yokes. But those B&T A833 A-body trannies aren't too hard to find and aren't in big demand.
One question is whether or not your overdrive tranny is from an A-body or is it the longer B & C-body unit?
Last edited by Ray Bell; 03/22/19 08:12 AM.
