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NP231 Doubler Adapter

Part Number FS-NP-231
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NP231 Doubler Adapter
Included but not in the picture is the short shaft and all needed hardware
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Rear Case
Dana 300
Rear Case Spline Count
23 Spline
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Need lower gearing on the trail while still being able to cruise on the highway? FST now offers our 231 Doubler Adapter with rear case clocking ring. This adapter turns the front planetary half of the 231 you have laying in the shop into a 2.72:1 crawl box. This kit can be bolted to the back of the front half of existing 231J 21 or 23 spline transfercases. Then you can choose which round 6 bolt rear case to run. There are many options so do your research or ask questions if needed. The most commonly used rear case is a 23 spline 231J, a 231J with 231C or HD 6 gear planetary, and even a 23 spline Dana 300. With our clocking ring you can rotate the rear case in 7 degree intervals to provide more clearance or a transfer case flip.
Our doubler kit comes complete with the adapter plate and clocking ring manufactured from 6061 1/2" aluminum, the weld in block off plate already pre ground to a perfect fit and ready to weld in, a new custom splined 4340 chromoly heat treated half shaft, and all the needed hardware.
To complete your doubler install you will need to source your own 231J front half and a complete 6 round bolt pattern case to run in the rear. You will also need driveshafts made for your required length. An additional crossmember to support the rear case is always a great idea.
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