As discussed earlier, there are so many possibilities of combinations of Muncie parts (once they have been broken, repaired, combined, etc), it's difficult to deterine from external id cues. Your trans seems to be a 'wide ratio' unit now based on your testing. It also seems to be a 'combination' of parts, rather than a complete trans as manufactured by GM-Muncie. Since it isn't your original trans (NO VIN), it doesn't much matter; clean it.. check it. and use it as it is if it's in good condition. (Wide ratios seem to work better with the Z28's anyway - if the 302 is present - as it gives you a bit more gear when pulling off - which the 302 needs unless it's revved above 3-4K.. *G* OR unless you have very big gears (4.11 or greater ratio).