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The New Process (later New Venture) 241 is a chain-drive, part-time, aluminum-case transfer case with a 2.72:1 low range. It went into full-size Dodge Ram and GM K-series trucks for years, and the heavy-duty and Rock-Trac versions still show up in Rams and Jeep Wranglers. It is a tough case. Most 241s that come apart need seals, bearings and a chain, not hard parts.
That is good news for your wallet, but only if you buy the right kit. A reseal kit will not fix a bearing whine, and a full overhaul kit is wasted money if all you have is a leaking output seal. Here is how to pick.
Know Which 241 You Have
There are several 241 variants, and bearing and spline specs differ between them. Read the tag on the rear case half before you order anything. Our transfer case tag guide shows where it is and how to read it.
- NP241 (Dodge): 1/2-ton and 3/4-ton Rams, gas V8 and early Cummins.
- NP241DHD: the heavy-duty Dodge version used behind Cummins and V10 trucks, with a narrow input on some years.
- NP241 / 241C (GM): K-series pickups and SUVs. Different input and output splines from the Dodge cases.
- NV241OR Rock-Trac: Jeep Wrangler Rubicon version with a 4:1 low range and 32-spline outputs.
The Three Kit Levels
1. Gasket and Seal (Reseal) Kit
Case gaskets, input seal, front and rear output seals, shift shaft seal and O-rings. This is the right kit when the case is quiet, shifts cleanly and just leaks. Our TSK-241 reseal kit covers the NP241 in 1987-2001 Dodge trucks with the 5.2L and 5.9L V8, plus 1994-1996 5.9L Cummins and 8.0L V10 trucks.
2. Bearing and Seal Kit
Everything in a reseal kit plus the input, output and front output bearings. Buy this level when the case whines or growls under load, when you find metal on the drain plug magnet, or any time you are already splitting a high-mileage case. Bearings are cheap compared to doing the job twice.
3. Master Overhaul Kit
Bearings, seals and gaskets plus snap rings, thrust washers and often shift fork pads. A master kit makes sense on a case with very high miles or one that came from a junkyard with unknown history.
What Most Kits Leave Out
No rebuild kit includes every wear item. Inspect these while the case is apart and budget for them:
- Drive chain. A stretched chain causes a clunk on takeoff, a slapping noise in 4WD and eventually wears through the case. Measure the slack. If it deflects much past a half inch on the sprockets, replace it. For NP241C cases we stock the HV-025 chain. More on this in our chain stretch guide.
- Oil pump. Check the pump gears and the rear case bore for scoring. Some GM 241s suffer the same rear-case pump rub that makes the NP246 famous.
- Shift fork pads. Worn pads let the sleeve pop out of 4WD. Cheap to replace, often missing from basic kits.
- Output yokes. A grooved yoke will chew up a new seal in weeks. On a Wrangler JK, the 32-spline 1310 end yoke replaces a worn front or rear yoke. For a JK running a swapped-in aftermarket NP241 with a double-cardan rear shaft, use the 1350 CV rear output flange. Our JK yoke guide covers the swap.
- Planetary and mainshaft. Check the planetary gear teeth and the mainshaft splines. Chipped teeth or worn splines mean a used part or a replacement case.
NP241 Rebuild Cost
| Job | Parts | Shop Labor | Typical Total |
|---|---|---|---|
| Reseal only, DIY | $50-$90 | Your time | $50-$90 plus fluid |
| Bearings and seals, DIY | $120-$250 | Your time | $150-$300 |
| Bearings, seals and chain, DIY | $220-$350 | Your time | $250-$400 |
| Shop rebuild | $250-$500 | 5-8 hr | $1,200-$2,200 |
| Remanufactured case | $1,200-$2,500 | 2-4 hr | $1,600-$3,000 |
For a DIYer with a press and snap ring pliers, a 241 rebuild is a reasonable weekend job. Fill with the fluid the case calls for. Most Dodge and Jeep 241s take ATF+4, GM cases call for Dexron or GM's transfer case fluid. Check your owner's manual or our transfer case fluid guide.
NP241 Parts, Shipped Fast
Reseal kits, drive chains, yokes and flanges for the 241 family. Free shipping from the USA.
Shop NP241 Parts → More Drivetrain PartsFAQ
What comes in an NP241 rebuild kit?
A basic reseal kit has case gaskets, input and output seals, the shift shaft seal and O-rings. A bearing and seal kit adds the input, output and front output bearings. A master overhaul kit adds snap rings, thrust washers and sometimes fork pads. The drive chain and oil pump are almost always sold separately.
Do I need to replace the chain when rebuilding an NP241?
Not always, but measure it. If the chain has excessive slack on the sprockets, or the case clunks on takeoff or slaps in 4WD, replace it. A worn chain can wear through the case if it is left in.
Are Dodge and GM NP241 rebuild kits the same?
Not always. Bearings and seals can differ between Dodge, GM, heavy-duty and Rock-Trac versions. Read the tag on your case and match the kit to that model number.
How much does it cost to rebuild an NP241 transfer case?
DIY parts run about $50 for a reseal up to $350 for bearings, seals and a chain. A shop rebuild typically costs $1,200 to $2,200, and a remanufactured case installed runs $1,600 to $3,000.
What fluid does an NP241 take?
Most Dodge and Jeep NP241 cases use ATF+4. GM versions call for Dexron or GM transfer case fluid. Always confirm the spec for your year in the owner's manual.