JEEP NV3550 TRANSMISSION FOR SALE

Jeep NV3550 Transmission for Sale: The Ultimate Guide

The Jeep NV3550 transmission is a stout, well-proven 5-speed manual transmission for the off-road driving enthusiast , and it still works great for daily driving as well. The NV3550 transmission by New Venture Gear features a cast iron case for durability under hard use, and an aluminum top cover to save weight where structural rigidity matters less. The transmission features fully synchronized gears on all 5 forward speeds (with unsynchronized reverse, standard for manual transmissions of the era) to enhance smooth shifting. When you upgrade to this Jeep NV3550 transmission for sale here, you enhance your Jeep’s performance and durability , making this a popular choice for Jeep enthusiasts seeking reliability and a superior driving experience.

The NV3550 Transmission: A Brief Overview

The NV3550 is one of the more reliable 5-speed manual transmissions in the Jeep lineup, popular among off-road enthusiasts and Jeep daily drivers alike. This New Venture Gear-manufactured transmission features:

• Cast iron case , durability and heat dissipation for off-road use

• Aluminum top cover , weight savings where structural needs are lower

• 300 lb-ft torque capacity , adequate for the Jeep 4.0L inline-6 (235 lb-ft) with margin for mild modifications

• Fully synchronized forward gears , 5 synchronizers for smooth shifting

• Unsynchronized reverse , standard for manual transmissions of the era

This combination of cast iron strength and aluminum weight savings makes the NV3550 a good match for Jeep Wrangler TJ, Cherokee XJ, and Liberty KJ applications.

The NV3550 in Jeep Applications

### Jeep Wrangler TJ (2000-2004)

The primary application for the NV3550. Specifications in Wrangler TJ:

• Years: 2000-2004 (after replacing the Aisin AX-15)

• Engine: Jeep 4.0L AMC inline-6 (242 cid), 190 HP / 235 lb-ft

• Transfer Case: NV231 Command-Trac (4WD)

• Replaced: Aisin AX-15 5-speed manual

• Replaced by: NSG370 6-speed manual in 2005

The NV3550 in Wrangler TJ application is the most commonly sourced variant.

### Jeep Cherokee XJ (1999-2001)

Late-production XJ Cherokee applications:

• Years: 1999-2001 (final XJ production years before XJ ended in 2001)

• Engine: Jeep 4.0L AMC inline-6

• Transfer Case: NV231 (4WD)

The XJ Cherokee NV3550 is functionally similar to the Wrangler TJ NV3550 but with some application-specific differences (bell housing, output configuration, shifter location).

### Jeep Liberty KJ (2002-2004)

The Liberty KJ replaced the XJ Cherokee in 2002 and used the NV3550 in early production:

• Years: 2002-2004 (early Liberty applications)

• Engines: 3.7L PowerTech V6 or other Liberty engines

NV3550 vs Predecessor AX-15: Comparison

The NV3550 replaced the Aisin AX-15 in Wrangler TJ applications starting in 2000:

The AX-15 and NV3550 are NOT directly interchangeable , different bell housing patterns, mounts, and shifter locations. Both serve well in 4.0L Wrangler applications.

NV3550 vs Successor NSG370: Comparison

The NV3550 was replaced by the NSG370 in 2005+ Wrangler applications:

The NSG370 added a 6th gear for better highway efficiency and was generally considered a step up in performance, though some traditionalists prefer the NV3550’s cast iron case.

Key Engineering Features of the NV3550

• 5-Speed Manual with Overdrive 5th: Gears 1st (3.85:1), 2nd (2.18:1), 3rd (1.38:1), 4th (1.00:1 direct), 5th (0.78:1 overdrive), Reverse (3.16:1) , typical NV3550 ratios

• Cast Iron Case: Defining feature, providing durability for off-road impacts and heat dissipation under hard use

• Aluminum Top Cover: Weight savings where structural strength is less critical

• Fully Synchronized Forward Gears: 5 brass synchronizers for smooth shifting

• Hydraulic Clutch Actuation: Standard for Wrangler TJ applications

• Internal Shift Linkage: Direct top-mounted shifter (standard Wrangler shifter location)

• 300 lb-ft Torque Capacity: Suitable for stock 4.0L inline-6 with margin for mild modifications

Common NV3550 Service Items (Honest Disclosure)

Honest disclosure of known service items:

• Synchronizer Wear: At high mileage (150,000+ miles), 2nd or 3rd gear synchronizers may develop grind on shifts. Common service item.

• Shift Fork Wear: Some high-mileage NV3550s develop shift fork wear leading to “popping out of gear” issues (usually 5th gear).

• Bearing Wear: Mainshaft and countershaft bearings can develop noise at high mileage.

• Output Shaft Seal Leaks: Common service item.

• Input Shaft Seal Leaks: Less common but possible.

• 5th Gear Pop-Out: Some NV3550s develop a tendency for 5th gear to disengage under load. Often related to shift fork or 5th gear bearing wear.

• Fluid Issues: Wrong fluid (using gear oil designated for differentials instead of MTF) can damage synchronizers.

The NV3550 is generally durable when maintained per Jeep specifications with proper transmission fluid. Service interval: fluid every 30,000-50,000 miles, more frequent for off-road use.

Why Choose a Used Jeep NV3550 Transmission?

• Cost savings vs reman ($1,299 used vs $1,500-$2,800 reman plus core)

• Direct OEM fit for Wrangler TJ 2000-2004, Cherokee XJ 1999-2001, Liberty KJ 2002-2004

• Cast iron durability , better for off-road use than aluminum-case alternatives

• 300 lb-ft torque capacity , adequate for stock 4.0L and mild modifications

• 5-speed with overdrive , reasonable highway efficiency

• Manual transmission , preferred by many Jeep enthusiasts for off-road control

Here, you’ll find this Jeep NV3550 transmission for sale at the most reasonable price possible, with all 5 forward gears tested, reverse confirmed, synchronizer function assessed, and donor vehicle documented.

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