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New Process 231 Transfer Case
The New Process / New Venture 231 transfer case is one of the most durable and rebuildable transfer cases in the history of Jeeps.
Master Rebuild Kits
Features
Our master rebuild kit has been assembled for our customer's rebuilds as well as our own. It is hands-down the most complete kit we've seen anywhere and features all the consumable and wear item components.
Included in the 231 master kit is the chain, which we do not consider to be an optional rebuild item like so many others do. This is the highest grade chain available.
Contents
All kits include all the bearings, seals, gaskets, small parts, chain, magnet, oil filter, boot, shift lever bushing, thread locker compound, RTV sealant, face studs and instruction guide (not all items shown in image).
Applications & Compatibility
NP231 Versions
NP231's are consistent from 1988-1993. Beginning in the 1994 model year, New Venture changed the front input bearing from a wide version to a narrow version. By 1995, the change-over was complete, but individuals with 1994 model year transfer cases can't always be certain of which bearing their transfer case may actually have, unless they pull the front bearing retainer or even fully disassemble the NP231 and check this input gear bearing.
- The early NP231 uses a BD50-8 bearing, measuring 24mm wide
- The later NP231 uses a 6010-N bearing, measuring 16mm wide
The earlier style input gear, left, has a wide bearing journal. The later style input gear, right, has a narrow bearing journal.
For a more in-depth discussion of these versions, see this page.
Related Products
Parts List
Installation Requirements
It is very common for our customers to do top-level rebuild work, using good methods and by following our included instruction guide. We suggest the rebuilder have access to a set of snap ring pliers, and a small arbor press, in addition to standard shop tools.
Turn Key, Master Rebuilt 231 Transfer Case
Our NP231 is professionally and meticulously rebuilt. We use the best components, including bearings, bushings, seals and gaskets built by our Dana 18 specialists and experts. All known updates and improvements are performed. Put the experience of thousands of Dana transfer case rebuilds to work for your Jeep.
Because of the variations involved and shipping options available, we encourage you to contact us directly by phone or e-mail. We will help you put together the transfer case which best fits your requirements.
Note that we can supply a core NP231 or we can arrange to have yours sent in with a core credit of $300. Transfer cases are built to order and typically take 1-3 weeks to ship. Contact us for current build times. Checkout our prices here: Rebuild Services
Logistics
your transfer case package is palleted and wrapped (if trucking is required) or packaged in a double-wall box (if by parcel), fully insured and ready to bolt into your application. Novak will seek the best competitive shipping rates with our extensive trucking networks. It will arrive at a location of your choosing, though we strongly recommend a business location with a dock / forklift for delivery (if trucking), as residential and liftgate fees can add up to an extra $100. per delivery.