AX5 Manual Trans for 1987-1991 Jeep Wrangler 5 Speed

Description

A 3.93:1 rock-crawling first gear and 175 lb-ft torque rating give four-cylinder trail patrol rigs positive traction over steep boulder inclines. The Jeep Wrangler AX5 Remanufactured Transmission outfits 1987 to 1991 Jeep Wrangler YJ 2.5-liter four-wheel vehicles. Hand-shimmed countershafts and upgraded brass blocker rings prevent gear pop-out on rutted forest service roads across every shift.

A split-case cast aluminum housing incorporates an intermediate iron plate that holds shaft centerline tolerances under high torque. Case-hardened 8620 steel helical gear sets mate with sealed roller bearings to maximize service life. Weighing 85 pounds dry, this five-speed manual transmission takes 3.3 quarts of 75W-90 GL-4 gear oil and mates directly with factory New Process transfer cases.

Key Features of Jeep Wrangler AX5

Off-road fleet mechanics looking to buy Jeep Wrangler AX5 manual transmission packages obtain hand-built drivetrain hardware ready for harsh work cycles. Rebuilt shift towers and micro-finished gear synchronizer cones eliminate gear grind during high-rpm shift changes.

• Precision-machined brass synchronizer rings eliminate third-gear shift grind during rapid lever engagement
• Case-hardened 8620 steel gear teeth absorb heavy mechanical shock loads under full cargo transport
• High-strength ductile iron center sandwich plates maintain true gear mesh under severe torque conditions
• Micro-finished gear faces reduce friction losses and lower operating noise across highway cruising speeds
• Hardened shift forks and steel detent balls eliminate gear pop-out under heavy engine braking loads
• Tapered roller countershaft bearings maintain rigid shaft preloads to eliminate gear pitch walk
• Remanufactured AX5 Wrangler gearboxes pass dial indicator bore inspections to ensure zero shaft bind
• Double-lip output seals prevent oil escape around the transfer case input adapter seal ring

Drivetrain Ratio Torque Ratings

Continuous input torque capacity reaches 175 lb-ft at 4,000 RPM under severe off-highway fleet duty cycles. Internal forward gear reduction steps provide 3.93:1 first, 2.33:1 second, 1.45:1 third, 1.00:1 fourth direct drive, and 0.85:1 fifth overdrive, backed by a 4.74:1 reverse ratio. External case surface dissipation keeps gearbox lubricant temperature between 150°F and 180°F during low-range rock crawling.

Four-Wheel Transfer Case Spline

The 21-spline rear output shaft locks flush with New Process 207 and 231 transfer case input gears without spline bind. The 14-spline input shaft pilot snout measures 0.590 inches in diameter with dial runout verified under 0.0011 inches. Total output shaft runout verifies below 0.0013 inches, preventing vibration through the transfer case.

Clutch Release Bleeding Protocol

Bleed the internal hydraulic release bearing thoroughly before initial road tests to guarantee complete clutch disengagement off idle. This manual transmission unit is not engineered for competition mud bogging, drag strip racing, or vehicles equipped with tire diameters exceeding 31 inches.

• Inspect transmission gear oil and wipe debris off the magnetic drain plug every 30,000 miles
• Drain gearbox sump and refill with approved GL-4 manual gear lubricant every 12 months
• Examine the shifter base seal and inspect floor pan rubber gaiters every 24 months

Commercial Warranty Crate Manifest

Backed by an extensive 3-Year / 100,000-Mile commercial fleet warranty, this drivetrain ensures long operational service life. The transport crate contains the fully remanufactured manual transmission unit, shift tower seal, reverse switch, technical installation guide, and certified spin-test records.