Bread,
Here's a photo of a Camaro T5 bearing retainer.
Camaro bearing retainer. It looks like you cut the tip off the S10 shaft. Here's a photo of my 1965 3 speed manual shaft and the length is exactly the same a a V8 Camaro T5 shaft.
3 speed input shaft The bearing retainer should be about 3.25" in
total length when you measure from the face of the transmission case. Here's a picture of my original 3 speed bearing retainer. As far as I can tell, all of the older 3 and 4 speed 2WD trucks had these same dimensions.
Bearing retainer TOTAL LENGTH.
