One person’s debris is generally addition else’s treasure. With this in mind, we are profiling a few enthusiast-worthy OE alteration cases from U.S.-brand applications. It will hopefully advice attenuated bottomward low-range arcade in the classifieds or in the junkyard.
New Process/New Venture alteration cases are accessible to identify. Aboriginal models accept a ellipsoidal ID bowl busted to the aback of the case; newer ones accept a annular red/silver/black tag on their backsides. BorgWarner models accept an accumulation tag anchored by one of the housing’s ts.
The accompanying blueprint gives an overview of best Detroit Three alteration cases. Listed dates are sometimes accomplishment years as against to agent archetypal years. Also, all alteration case models can accept several variations depending on appliance and year. All listings are part-time and chain-drive/aluminum-case unless contrarily noted.
Dana/Spicer Archetypal 18, Ford GPW 7700Identify: Outputs account to the commuter side; an oil pan; rear PTO; output-mounted boom emergency brake; best models accept accompanying sticks.Early Military (1941-1945): MB and GPW applications had a 1.97 low-range; aboriginal Ford and Bantam versions army with the disciplinarian ancillary dropped.Early Civilian (1945-1946): Rare. They came in the CJ-1 and aboriginal few CJ-2s; 2.43 low-range.Mid Civilian (1946-1955): 2.46 low-range; beyond 11⁄8-inch-diamter average idler shaft.Later Civilian (1955-1971): Average shaft bore added to 11⁄4 inches.Final Civilian (1966-1971): Uses the Dana 20 case casting; rear analysis bore added from 35⁄32 inches to 4; distinct stick.Lubricant: 85W-90 accessory oil.Notes: Overdrive units were generally acclimatized to the PTO port. Some Ford GPWs acclimated the Aboriginal Military Archetypal 18, while others had the 2.46-low Ford GPW 7700 alteration case.
Dana/Spicer Archetypal 20Identify: Distinct shifter; aforementioned casting as the after Archetypal 18; rear achievement is centered. Low-Ranges: 2.0, 2.34, 2.46Lubricant: 85W-90 accessory oilNotes: Versions additionally appeared in Jeep, IH, Ford, and Chevy 4x4s. Some genitalia are changeable amid versions. The ’66-’72 Bronco had the T-shift with 2.46 low-range; ’73-’77 cartage had the 2.34-geared J-shift variant. The Bronco Archetypal 20’s sliding accessory can be accumulated with Archetypal 18 apparatus to actualize a 2.46 low-range in Jeep and IH Archetypal 20s.
Dana/Spicer Archetypal 300Identify: Passenger-side advanced output; centered rear output; distinct stick; 6-t annular alliance surface; aluminum appendage housing.Low-Range: 2.62Lubricant: 80W-90 accessory oilNotes: Possibly the best OE Jeep alteration case due to backbone and 2.62 low-range. The ’80 archetypal has a 31⁄2-inch rear achievement housing. This added to 51⁄2 inches in 1981 to fit beyond speedo gears. The Archetypal 300 served as the archetypal for the aftermarket Atlas alteration case.
BW 1305/BW 1339Identify: Outputs account to the commuter side; the aluminum case is breach laterally; 1339 models (shown) accept a gear-reduction box.Low-Range: 2.57 (BW 1339)Lubricant: Special fluidNotes: Unveiled in the ’73 Wagoneer, the Quadra-Trac BW 1305 was the aboriginal accomplishment chain-drive/aluminum-housing alteration case. This full-time assemblage didn’t accept a low-range. The BW 1339 adaptation added a all-embracing gearbox to aftermath a low-range. This alteration case has an centralized differential, which can be bound by a glovebox-mounted exhaustion about-face to breach torque analogously advanced to rear. Rebuild genitalia are rare, although MileMarker offers a part-time about-face kit and an overdrive chain. The Archetypal 18 is a absolute replacement.
BW 1350Identify: Ribbed magnesium caseLow-Range: 2.48Lubricant: ATFNotes: Electric and chiral shift; in ’83-’93 Ranger and ’84-’90 Bronco II/Explorer.
BW 1356FIdentify: Ribbed magnesium case, continued aluminum tailshaft housingLow-Range: 2.69Lubricant: ATFNotes: The 1356 replaced the 1345 in the 1987 Bronco. It was in the Bronco through 1996 and in F-Series trucks and motorhome chasses from 1988 to 1991. Chiral (pre-1992) and electric about-face versions were made.
NP208Identify: Aluminum case; driver-side advanced output.Low-Range: 2.62Lubricant: ATFNotes: It looks agnate to the NP207 but has a 23-spline ascribe shaft. Begin in ’80s Cherokees and pickups, it is the affection of the Command-Trac system. Dodge and Jeep versions accept t-on yokes; others accept a slip-yoke.
NP203Identify: Cast-iron housingLow-Range: 1.96Lubricant: 85W-90 accessory oilNotes: Abounding of these full-time alteration cases accept been acclimatized to part-time with manually locking advanced hubs appliance a Doug Nash-designed kit, now awash by MileMarker. Depending on OE application, ascribe spline counts are 10, 28, and 32.
NP205Identify: Aluminum achievement and ascribe retainers; advanced achievement can be account to either commuter or disciplinarian side; rear centermost output; rear awning is annular and has three ts; a afar adaptation has a bond on the input; some accept a rear blooper yokeLow-Range: 1.96Lubricant: 85W-90 or added accessory oil.Notes: The baron of heavy-weight light-duty alteration cases, its capital accommodation is low-range gearing. Aftermarket upgrades accommodate lower-gear gearsets and piggybacks as able-bodied as accompanying sticks. Each U.S. manufacturer, including IH, acclimated the NP205 at some point, and six altered input/output versions exist.
NP/NV 241Identify: 6-t advanced face. Advanced achievement is either on the disciplinarian ancillary (IFS) or commuter ancillary (solid axle). Aboriginal acceleration sensors are mechanical, after are electronic.Lubricant: ATFLow-Range: 2.72Notes: The 241OR Rock-Trac adaptation (shown) in the Wrangler Rubicon is admired for its 4.0 low-range and anchored achievement bond with cyberbanking acceleration sensor. The apartment has added ribs than the NP241D begin in Dodge trucks. The Dodge adaptation additionally has a continued blooper bond housing. Ascribe shaft spline counts alter depending on assignment rating: 23, 27, 29, 31 and 32. The Dodge/Ram 1⁄2- and 3⁄4-ton adaptation is appointed 241DLD; the 241DHD 1-ton archetypal includes a PTO output.
NP 207Identify: Aluminum case, driver-side advanced output.Low-Range: 2.60Lubricant: ATFNotes: One of the weaker Jeep alteration cases, it was in ’84-’87 XJs and the ’87 YJ.
NP/NV 242Identify: 6-t advanced face; longitudinally ribbed case; rear outputs can be either anchored or slip-yoke.Lubricant: ATFLow-Range: 2.72Notes: This alteration case offers a driver-selectable full-time mode, which splits front/rear torque 48/52 percent. It additionally has “normal” 4-Hi and 4-Lo. The Hummer adaptation has stronger 32-spline shafts, a 6-pinion differential, a added chain, and a cooler. Jeeps (shown) accept 21- and 23-spline ascribe shafts, depending on OE transmission. The 242 is durable, and backup genitalia are plentiful.
NP/NV 231Identify: Driver-side advanced output; centered rear output; 6-t advanced face on Jeep and Dodge, and 5-t advanced face on GM.Low-Range: 2.72Lubricant: ATFNotes: One of the best accepted alteration cases, a 231 adaptation appears in abounding contempo GM and Chrysler/Jeep 1⁄2-ton applications (231J shown). Aboriginal models use a cable-driven speedometer. Electric acceleration sensors appeared in 1992. GM 231C models can be acclimatized to Jeeps if abounding genitalia are alloyed and interchanged. Jeep versions (14 configurations were made) accept capricious ascribe apparatus depending on their OE transmissions. Also, non-TJ models accept a blooper yoke, which enthusiasts generally catechumen to a anchored yoke. The heavier-duty 231HD appears in the ZJ Grand Cherokee, and the 231HDD is in Ram 1500s (12 Dodge versions were built). Abounding backup and upgraded genitalia are available.
NV 261/NV 263Identify: Magnesium caseLow-Range: 2.72Lubricant: ATFNotes: The 261 is automated shift; the 263 (263GM shown) is electric shift.
NV 271/NV 273Identify: Magnesium caseLow-Range: 2.72Lubricant: ATFNotes: Basically the aforementioned case, the 271 has a chiral shifter and the 273 (shown) is electronically shifted; begin in Ram and Ford HD trucks.
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