I have a 65, or 66 B body rear I could swap a 3:91 open punkin in. Not sure what the final drive ratio would be. with the 833OD would be. It has 3:23' 7.25 now.
I need to clarify my mess. I want to get rid of my 3:23 7 1/4" rear. They have worked good as in 22mpg @ 82mph with the original 3 speed.
I have a 65, or 66 B body rear in the shop. I have a complete chunk that could go in it. It's an open 3:91.
I was wondering about the 3:55's with the sure grip 8 1/4" in the shorty van. Pulling out the guts and swapping them into an A body 8 1/4"