[dennislbrooks]

Is that a 12 bolt rear diff you will be using in your 42? Will your bellhousing accept a T5 --- 4 1/4 inch hole or 4 11/16 like later 235/261? Not sure if GMC were different. I kicked around a sm465 but gave up becuse of weight and the large hole for the input shaft bearing housing. I wanted to retain the floor pedals and they connect to the earlier bell housing 4 1/4 that has the bolt bosses for the shaft mount. The cab on my 42 was a little better than yours --not much-- but I did use 6 -- 2 lb non flux spools in my 42 but that also included welding in a custom floor to clear the 700r4 bellhousing.