At some time or another someone here posted a link to a bunch of saginaw casting numbers that said which numbers are what ratios, et. I have a GM speed I want to rebuild, but I want to know EXACTLY what it is before I order any parts. The number on the side cover is GM17 3952645. It has another number below that; A270. I have been making my self CRAZY trying to find info on these numbers. HELP!!
Boo