Why not slip in the whole later axleshaft assembly? All GM 44s are alike, right? Wrong. Compare the early '69 Blazer 44 axleshaft length (upper) to the '74 disc brake donor (lower). GM ran only two versions of the 44 from 1973 through 1978 and their axleshaft lengths match most '69-'72s (but not the Blazer's).