All S10's with the 4.3,91 and up ,have the NV3500 trans.The larger trucks with V-8's usually have the NV4500,but the 88-92 or so big trucks has a Getrag 5 speed,troublesome at times.
The NV's have an intergal clutch housing as mentioned,if you have the time ,tools and skill,the clutch housing can be machined away and an adapter made to work on the 235,maybe.
At any rate, NV tranny replacement parts are expensive and they require some special tools for disassembly.Too bad, it's a far more robust trans than the T-5
