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AX-15 – 5-Speed Manual
Jeep Wrangler: 1988.5 - 1999 with 4.0-liter Inline 6
Factoids:
Replaced weak Peugeot BA10 gearbox
Related to Toyota Supra Turbo R154 manual
Best 5-speed ever installed in a Wrangler
Spotting Tips:
All-aluminum case & mid-plate, generous ribbing
Only mounts to a six-cylinder engine
10 spline input shaft
23 spline output shaft
Length: 16 1/2”
Spline Stick-out: 7 1/8”
Gear Ratios: 1st 3.83, 2nd 2.33, 3rd 1.44, 4th 1.00, 5th 0.79
AX-5 – 5-Speed Manual
Jeep Wrangler: 1984 - 2006 XJ, YJ, TJ with 2.5-liter Inline 4
Factoids:
Failure prone 5th gear, poor synchronizers, throwout bearing leaks (pre ’94)
AX-5 variants include Toyota G52, W58, and R151
Spotting Tips:
All-aluminum case, cast iron mid-plate
Looks like AX-15 so be wary
Only mounts to a four-cylinder engine
14 spline input shaft
21 spline output shaft
Length: 15 5/8”
Spline Stick-out: 7 1/2”
Gear Ratios: 1st 3.92, 2nd 2.33, 3rd 1.44, 4th 1.00, 5th 0.85
NV3550 – 5-Speed Manual
Jeep Wrangler: 2000 - 2004 Wrangler with 4.0-liter Inline 6
Factoids:
Replaced AX-15
Compatible with 23 spline version of NP231 transfer case
Spotting Tips:
All-aluminum case
10 spline input shaft
23 spline output shaft
Length: 16 3/4”
Gear Ratios: 1st 4.01, 2nd 2.32, 3rd 1.40, 4th 1.00, 5th 0.78
NSG370 – 6-Speed Manual
Jeep Wrangler: 2005-up Wrangler, 2004-up Wrangler Rubicon
Factoids:
Replaced NV3550
Compatible with 4.0-liter I6 and 3.8-liter V6
Spotting Tips:
All-aluminum case with extensive ribbing
10 spline input shaft
23 spline output shaft
Length: 23 1/2” w Inline 6 bellhousing
Length: 24 3/4” w/ 3.7-L V6 bellhousing
Gear Ratios: 1st 4.46, 2nd 2.61. 3rd 1.72, 4th 1.25, 5th 1.00, 6th 0.84
