A230 gears info

I'm almost certain you are correct on the different bellhousing bolt patterns. Now I have forgotten about A230 or its variant known as A250 being used in the trucks. I would be willing to bet there were several vans and trucks with 383 and 400 engines (maybe even 361 truck?) with those types of three speeds. I think two or three holes are different on the three speed bellhousing face from the A833. And for proof, I know where there is an HD truck bellhousing here for 11 or 12 inch clutch application that had NP435/445 bolt pattern with the 9/16 bolt holes and the A230 bolt pattern with 3/8-16 holes. I cannot remember, but I think it also had an a833 pattern. There's an Overdrive a833 transmission right next to it so I'll check when I go to where it's at again.