The bell housing on the nv3500 is not removable. If we're talking about a 92 3500 as your user name suggests, you have a nv4500.
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Hey guys had a ? . Can the Chevy nv3500 bell housings be swapped. Say internal slave to external slave .
A complete NV3500 with an internal or external slave-that came off off a cast iron small block will fit. And the external slave works. Be careful with the routing the line to the slave. Convert to aeroquip style with threaded ends.
I've been running a '95 NV3500 with an NP241 behind a 489 for 3 years without an issue. Make sure your rear drive shaft is spot on correct length. Another issue you will see is different output spline count if 4x4 or 4L80.
No doubt an NV4500 is stronger, but it lacks the gear splits and "feel" of a 3500 . My Sub feels like a 6000 lb Camaro. Pleasure to drive.
If you're doing an auto-to-manual, find a correct year donor for the dinky bits pedals...etc.
It'll bolt in...good bit of work. Don't forget the pilot bearing!