These shafts are from an LS cable trans. How can I figure out if these are the small shaft (90-91) or big shaft (92-93)?

 

Everyone's just as clueless as me, eh?

 

Here's a wild guess -- small shaft. I have my 92 YS1 (definitely the big spline) apart, and the top countershaft bearing on yours looks different than mine (the 92+ have got 2 bearings on the top of the countershaft, and that looks like 1 fatter bearing on yours). Feel free to correct me, though, as this is just a guess.