I swapped out a T5 for another T5 with different gearing. The 1995 S10 T5 required an adapter plate to convert it to a Muncie bell bolt pattern. Much to my disappointment, I found out the adapter plate must first bolt to the bell. That required removal of the pressure plate and clutch disc so I could install the top 2 adapter plate bolts which insert from INSIDE the bell. So the fiddle factor is significant unless you are starting from scratch.
Since the adapter plate effectively made this T5 about 5/8” longer than the other T5 (due to the thickness of the adapter plate), I needed a slightly shorter driveshaft. I have a Chevy Blazer shaft that was the correct length and only needed a conversion U-joint at the rear to make it work. It had the correct slip yoke already.