NV3550 5 Speed Conversion Packages

Click here for NV3550 Conversion Kits

Sale Pricing for a limited time:

Rebuilt  and Dyno Tested NV3550 – $985 + $350 core charge (refundable upon return of good reuseable core without a cracked case). Shift tower not included. One year warranty, unlimited miles if for personal use and 6 months for commercial use.

NV3550: General Information:

In 2000, Jeep began using the NV3550 in Wrangler TJs and Cherokees. It has become the medium duty 5 speed of choice. It is plenty strong for a medium size small block V8. All five gears are fully synchronized and shift very smoothly and easily.

This unit is conservatively rated by New Venture Gear at 300 ft/lbs torque handling capacity. The NV3500, used by GM and Dodge with V8 engines, is an earlier version of the same transmission.

Length: 16.75″ Including integral transfer case adapter
Weight: 100 lbs.
Bellhousing Bolt pattern:
Input Shaft/spline: 1-1/8″ 10 spline

Oblong pattern, with 9 metric bolts. It shares the same bolt pattern with the Japanese made AX15 as used in Wranglers 1989-1999.

Gear Ratios:

First Gear4.01
Second Gear2.33
Third Gear1.39
Fourth Gear1.00
Fifth Gear0.78


Dry Weight97 lbs.
Oil Capacity2 liters
Rated GVW:7200 lbs.
Length (OAL from Engine to Transfer Case24 (incl Bellhousing & T-Case Adapter
Case Material:Cast Aluminum
Rated Torque300 ft/lbs (conservative)
Input shaft & spline1-1/8", 10 spline

Jeep/Dodge have a part number for Lubricant for the NV3550: 4874464 We have been advised, however, by our New Venture rep that a 30 wt non foaming gear oil is suitable for this transmission, and will be covered under warranty. It uses about 2.2 qts. NOTE: It is NOT recommended to use ATF in this trans.


Jeep Factory shifters:

Early style: Square shift stub: Shift handle fits on and is located with a set screw

Late Style: Round shift stub with a female thread.

There is also a type where the stub comes up and is flattened, and has two holes drilled though it around 3/8 dia. A shift handle is mounted parallel to this using two thru bolts

Aftermarket: Both B&M (available from Summit Racing PN BMM 45048) as well as Hurst (PN 3910113) make aftermarket short throw shifters. (We do not carry these)

Back-up light switch wiring:

A customer has advised me that wiring pigtails and kits to build compatible connectors are available from

Info: http://www.weatherpack.com/

Conversion Packages

High Impact offers custom engineered conversion packages. Complete NV3550 installation packages are available for MANY vehicles. These include needed Bellhousing or adapter, any needed clutch components, transfer case adapters. Transmissions are custom configured with correct input/output shaft as is optimum for the application.

The fine print: As for “is it 100% Bolt-in”, yes, all the components should bolt together fine. However, I would never consider or assume any installation of a transmission that did not come in the vehicle was going to be 100% bolt in: 1. Might work out that way. 2. Most cases have a few issues you will need to figure out on the fly. 3. Occasionally there is some issue we did not anticipate that turns out to be a hassle. That is rare. In any event, our customer service is always available to help you resolve whatever issues may arise in your conversion. Our Tech Support is generally quite a bit more knowledgeable than the average Joe you get on the line!

Partial list of Applications:

NV3550 Conversion Packages

We have on-line kit descriptions up for these items:

Jeep CJ with AMC engine
Other applications available – Call or E-mail with what you have in mind: info@high-impact.net