the cast iron cases came out in the early 80's, gm then went to alum. i believe this trans was used in pickup/ van applications until 1987. you can identify it by it's gm 10 spline input and common small gm output same as a muncie or three speed. the case is the same length as a 3 sp. the case is round on top not like any other gm trans. the bellhousing bolts share the gm pattern on the pass side , while on the driveside only the lower bolt is the same as gm. the top bolt is in a different location. i think many of you could easily modify your bell to accept this bolt though. i have some extras of this trans to sell if anyone wants one. just drop me a line. tom
