I can’t claim to be brilliant.
I’d be happy to help get you on the right track with your T5 installation. There are so many ways to go about it.
If your S10 T5 has a Muncie bolt pattern (1983-93 S10) then your going to find the installation very straight forward. If you intend to keep a working cable style speedometer, then you might have to swap tail housings if your T5 has a VSS style speedo output.

Anyway, here’s how I installed my T5 in my 1965 C10. Your installation will be VERY similar. You will notice that my T5 has 26 shaft splines and a 26 spline clutch disc because I custom built my T5 using S10 parts and V8 Camaro gears. Your T5 will have 14 splines and I’d strongly encourage you to do a Jeep shaft swap to convert it to 10 splines.

Here’s a link to see my installation. https://lugnutz65chevystepside.weeb...stallation-from-engine-to-rear-axle.html

1965 Chevy C10 Shortbed 1/2-Ton Stepside
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