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Discussion Starter · #1 ·
I have a 1991 S10 (4.3L with 700r4), and I was wanting to throw an NV3500 in there. I know I need everything from a shift knob to the pedal assembly. I know I'll have to cut a hole for the shifter, but as far as installation I don't have a clue. Would I have to get a new crossmember? Would I have to hack at the firewall for the pedal assembly? I have heard that I will need to remove the dash but I'm not entirely sure. Any input would be much appreciated.
 

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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:
 

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Discussion Starter · #3 ·
There are not really any s10s in good shape near me, especially a 4.3 5 speed. I was just going to find the pedal assembly, transmissions, etc. and throw it in there. I know if i go with the NV3500 I'm going to need the variant with 1st gear having a 3.49:1 ratio.

So far my list consists for the swap consists of:

  • Transmission
  • Shifter
  • Shift knob
  • Shift boot
  • Pedal assembly w/ cable linkage
  • New rear end gears
  • Possibly driveshaft?
  • And now a clutch safety switch


I really didn't think about a clutch safety switch. How would I go about wiring it? And as far as a rear end what gear ratio should I go with?
 

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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.
 

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Discussion Starter · #5 ·
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.
 

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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.
 

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Discussion Starter · #7 ·
Ah ok. I’ll start pokin around more online and see if i can find a bit more info before I attempt a swap.
 
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