I have a factory 8 3/4 rear with a 489 case. Suregrip with 3:23 gears. Looking to change the chunk with a swap for another case. Its the factory unit the car came with. Is this considered a small yoke? How many splines would this be? Fine or course? Assumeing this is a cone type as well. Correct? Getting educated on Mopars as I have been in another manufacturers camp for a while. Expand my knowledge guys. Thanks.