My basis for making this post was that I have a 94 GMC 1 ton dually 4x4 with a Carbed 84 pace arrow 454 nv4500, and 411 gears, but i cant keep a t/o bearing\hydraulic system in it for more than six months with normal street use, so I am converting it to mechanical linkage with a 1697C TOB (rounded contact surface).
I dont trust the aluminum factory bellhousings, and the 55 through 72 Chevy bellhousing will not work, so I bought one like this on ebay. I can make my own plate if I have to, main thing I am worried about is if it will fit the large 168 tooth 454 flywheel, dont want to waste a week waiting if it will not.
I tried the 55 to 73 cast iron chevy bell housing, it fits the bearing retainer, but the other holes dont line up to mount the tranny, even drilling and taping the case wont work, which is what led me to the steel scattershield bellhousing, which is easily modifiable.
Coincidently, this ebay item posted at the same time mine was removed for sale, but hopefully it answers the question, since it has BB and SB taped on it. And the two piece design was why I wanted it so I could change the TOB and clutch disc without pulling the bellhousing, I can rest the input shaft of the NV4500 on the bellhousing without completely having to drop the tranny and transfer case, and eliminate the accursed hydraulic clutch system.
