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Old 11-04-2010, 11:39 PM   #1
JJorgensen52
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Join Date: Apr 2007
Location: Southeast CT
Posts: 1,472
My NV4500 Swap Thread

For the moment this is just going to be a bit of a picture dump, I'll come back and flush it out with more info this weekend (like part numbers, measurements etc):

Basic gist:
1995 NV4500 (GM) with Advanced Adapters bellhousing (manual clutch).
1990 NP241C from a Suburban (passengers drop).
Stock clutch and linkage.
Custom rear (1350 u-joints) and front (1330 double cardan / stock 1310 front yoke) driveshafts made to spec.
Modified stock SM465 tranny cross member, relocated one set of holes back
Stock Rockwell T221 T-case skidplate, relocated one set of holes back.
Big block (auto) high hump trimmed to fit NV4500 shifter with stock boot.
Mid 60's iron nose big-block high torque starter.

I still need to fabricate 4x4 shifter and linkage, and also a new shift lever for the tranny as the Nv4500 lever hits the bench and is generally just at the wrong angle.

I found that whatever combo of parts came in the Suburban my NP241 came out of happens to match mine, as my speedo (new cable, 83" length NAPA part) is actually more accurate (-1.5mph at 65) than it used to be (-5mph at 65).

This is absolutely a great swap. Truck is a joy to highway drive now, turning only about 2100 RPM at 65mph (used to be just under 3100RPM). Haven't tested 4x4 yet but I've had a NP241 truck before and it was pretty good so expecting good results.

Biggest drawback I can see is that with this particular Tcase I've lost perhaps 1.5" of ground clearance at the Tcase. Still above the pumpkins, but not so good for straddling obstacles. This is primarily a work rig so trail performance was not a huge motivator for me.

First estimate (not having totaled receipts) puts me at roughly ~$2500 for the swap, having pieced it together from various sources. A large chunk of that cost was the driveshafts. Would have been MUCH cheaper to have my factory shafts adjusted, but that's not my style. So it was on a semi-budget

I probably spent 2 solid 8 hour days on all of the fitting, fabricating and mock-ups I needed to get the install set. I probably could do the swap again, knowing what I've learned, in about 5 days start to finish.

Now on to the picture part. More or less chronological. I suspect this could have been done easily without ever removing the seat, but I needed mine out anyway and had to do some floor pan repairs so out she came.








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'69 CST/10 4x4 SWB Stepper 350 2bbl - NV4500/NP241C (Broken Truck!)
'72 Sierra Grande 2WD LWB fleetside 350-TH350 Refresh
'99 K2500 Silverado RCLB 5.7 Vortec - NV4500/NP241C (Daily)
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Last edited by JJorgensen52; 11-05-2010 at 12:12 AM.
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