Auto to Manual Swap - 1st Gen

Just find another 89-93 4.3 5 speed and take everything you need off it. It's a fairly big project. I'd pull the seats, dash and steering column for starters. I think the crossmember will be OK. Not sure on the driveshaft. You'll need to do some re-wiring to eliminate the park neutral safety switch and add the clutch safety switch. Back ups are wired different also. A 91 S10 factory service manual and this wiring manual would be a big help:
This is a 1990 S10 Factory manual, but IIRC there should be no differences:

There won't be any cable to the pedal it's all hydraulic. You rear end is fine as is. It's based more on engine size than trans type.
Do a search on here for auto to manual swaps. I get the feeling you need to study the details bit more before tearing into your truck.

It's all hydraulic? I thought the first gens had a cable clutch. I've been searching the forums but i'm seeing a lot more stuff for the second gen stuff, and I'm not entirely sure how different installing a transmission into the 2nd gen trucks are than the 1st gen. I figured I didn't absolutely need to regear the rear end, kinda thought regearing would probably help with fuel mileage.

If it's a 4.3, some had 3.08 rear ends and got better mileage than the more common 3.42 which had worse mpg, but better acceleration. Particularly in the heavier models.

Ah ok. I’ll start pokin around more online and see if i can find a bit more info before I attempt a swap.