Here’s a mini-spec list of the axles, transfer cases, engines, and transmissions that came stock in all TJ models and years. If you need to identify your axles, all the info you need is right there. The easiest way to see what kind of rear axle you have is the type of fill plug in it. If it’s steel, it’s a D44, if it’s rubber you have a D35c.

TJ Engines

TJ Transmissions

1997-2002 – 4 cylinder 2.5L 151 cubic inches 120hp @ 5,400 RPM 140 ft/lbs @ 3,400 RPM OHV 2 valves/cylinder compression ratio: 9.20:1 (97-00) / 9.10:1 (01-02) 1997-2002 – 6 cylinder 4.0L 242 cubic inches 181hp @ 4,600 RPM 222 ft/lbs @ 2,800 RPM OHV 2 valves/cylinder compression ratio: 8.80:1 2003-2006 – 4 cylinder 2.4L 148 cubic inches 147hp @ 5,200 RPM 165 ft/lbs @ 4,000 RPM DOHC 4 valves/cylinder compression ratio: 9.50:1 1997-2002 – 6 cylinder 4.0L 242 cubic inches 190hp @ 4,600 RPM 235 ft/lbs @ 3,200 RPM OHV 2 valves/cylinder compression ratio: 8.80:1 distributor free ignition

1997–2002 (2.5L) – 5 speed AX-5 manual 1st: 3.93, 2nd: 2.33, 3rd: 1.45, 4th: 1.00, 5th: 0.85, R: 4.74 1997–1999 (4.0L) – 5 speed AX-15 manual 1st: 3.83, 2nd: 2.33, 3rd: 1.44, 4th: 1.00, 5th: 0.79, R: 4.22 2000–2004 (4.0L) – 5 speed NV3550 manual 1st: 4:01, 2nd: 2.33, 3rd: 1.39, 4th: 1.00, 5th: 0.78, R: 3.57 2003–2004 (2.4L) – 5 speed NVG1500 manual 1st: 3.96, 2nd: 2.37, 3rd: 1.49, 4th: 1.00, 5th: 0.83, R: 3.54 2005–2006 (4.0L) – 6 speed NSG370 manual 1st: 4.46, 2nd: 2.61, 3rd: 1.72, 4th: 1.25, 5th: 1.00, 6th: 0.84, R: 4.06   1997-2002 (2.5L) – 3 speed TF999 auto 1st: 2.74, 2nd: 1.55, 3rd:1.00, R:2.20 1997–2004 (4.0L) – 3 speed 32RH auto 1st: 2.74, 2nd: 1.54, 3rd:1.00, R:2.20 2003–2006 (2.4L) – 4 speed 42RLE auto 1st: 2.84, 2nd: 1.57, 3rd: 1.00, 4th: 0.69, R: 2.21 2003–2006 (4.0L) – 4 speed 42RLE auto 1st: 2.84, 2nd: 1.57, 3rd: 1.00, 4th: 0.69, R: 2.21

TJ Axles

TJ Transfer Cases

1997-2006 – Dana 30 181mm Front axle on all models but Rubicon Gear ratios: 3.07, 3.55, 3.73, 4.10, 4.56 Open carrier WMS to WMS: 60.5″ 5 on 4.5″ bolt pattern Steel fill plug   1997-2006 – Dana 35c 194mm Rear axle on all models but Rubicon (D44 optional) Gear ratios: 3.07, 3.55, 3.73, 4.10, 4.56 Open carrier (Optional Trac-Loc limited slip) WMS to WMS: 60.5″ 5 on 4.5″ bolt pattern Rubber fill plug   1997-2006 – Dana 44 216mm Optional rear axle on all models but Rubicon Gear ratios: 3.55 (97 only), 3.73 Trac-Lok limited slip differential on early models, optional on later models WMS to WMS: 60.5″ 5 on 4.5″ bolt pattern Steel fill plug   2003-2006 – Dana 44 216mm Rubicon Front Axle Gear ratio: 4.10 Tru-Lok selectable pneumatic locker, open when unlocked WMS to WMS: 60.5″ 5 on 4.5″ bolt pattern Steel fill plug   2003-2006 – Dana 44 216mm Rubicon Rear Axle Gear ratio: 4.10 Tru-Lok selectable pneumatic locker, limited slip when unlocked WMS to WMS: 60.5″ 5 on 4.5″ bolt pattern Steel fill plug

1997-2006 – NV231 Command-Trac slip yoke 2.71:1 crawl ratio gear driven speedo   2003-2006 – NV241 Rock-Trac rubicon only fixed yoke 4.1 crawl ratio electric speedo