Transmission and Adapter Package – 2012-2017 Jeep JK – GM LS and small-block with TR-4050 Transmission


Ultimate Tremec TR4050 Jeep manual transmission swap.

This is the permanent NGS370 replacement.

Jeep JK GM TR4050



Do you own a Jeep Wrangler JK and are considering an LS swap? Do you love manual transmissions but have come to hate the factory sloppy-shifting and failure-prone NSG370 6-speed manual that was offered as the only manual transmission option in the JK? Quick Draw Brand has come up with the ultimate solution for those that want a reliable and bulletproof manual transmission in the JK  along with the power of an GM LS engine with with our  Transmission and Adapter Package for the Jeep Wrangler JK for an LS engine and Tremec TR-4050 transmission.

The Quick Draw LS and TR-4050 package combines two proven technologies and makes it easy to add both to a 2012-2017 JK. The Tremec TR-4050 is a 5-speed heavy-duty truck transmission that shifts like a car.  Smooth, short, and firm shifting, the TR-4050 shifts smooth and without hesitation.  Because of it’s wide gear ratio selection, stout construction,  and mild manners, this JK transmission swap works for both the off-road community and custom builds for street use. The transmission is rated the torque output of anywhere from stock to mildly built LS engines, making it an excellent choice for Jeep V-8 conversions. Our kit enables the TR-4050 to easily bolt in place of the NSG370. Bolt up the GM LS or small-block engine of your choice to the supplied bellhousing adapter, and you’re well on your way to a V-8 conversion in your Wrangler.

Our TR-4050 swap kit for the JK offers a simple and direct bolt-in replacement for the factory NSG370 manual transmission. The factory transfer case, drive shafts, cross member, exhaust, and slave cylinder all stay in their factory locations.  The factory driveshafts (or HD replacements if you’ve already upgraded) can be retained without any modifications. The exhaust cross-over tube will require a hammered dimple directly under the transmission for clearance.  This kit even uses the factory Jeep  clutch kit, making sourcing replacement parts easy.  The only modification required for the Jeep is a 1″ body lift to accommodate the slightly taller profile of the Tremec TR-4050.  Installation takes about 8 hours from removal of the NSG370 to final bolt tightening.  If you are interested in a TR-4050 Jeep kit for an automatic swap, future kits are forthcoming.

About the TR-4050

Quick Draw Brand developed the JK TR-4050 swap kit in partnership with Silver Sport Transmissions.The company is well known in the street rod world and is one of the largest dealers of Tremec transmissions in the USA. Wanting to expand into the truck market, Silver Sport discovered the TR-4050 among Tremec’s extensive line of OE transmission offerings that are sold all over the world. The TR-4050 is a heavy-duty 5-speed transmission that was originally developed for 1-ton truck applications. Fully synchronized, the TR-4050 sports a super-low 6.16:1 First gear ratio for crawling along with a 0.76:1 Overdrive for highway use. With a torque rating of 600 lb-ft, the TR-4050 is strong enough to handle everything from a stock Jeep all the way up to a fully built crawler with big tires and ultra-low gearing. At only 19.5 inches long, it’s also extremely compact for it’s impressive torque numbers, making it a viable swap candidate in a wide variety of vehicles. It’s size happens to be perfectly suited to the Jeep Wrangler JK, and with the Quick Draw swap kit, installing the TR-4050 is a direct bolt-in affair.

Reasons to replace the problematic NSG370 rather than repair it:

If you’re not familiar with the multitude of problems with the stock NSG370 problem, you might want to read up on it. For years, folks have looked for a solution to the Jeep JK NSG370 problem after they start upgrading the Jeep with larger tires and heavier axles.  Some of the NSG370 problems include broken bell housings, shifters popping out of gear, gears coming apart, and inconsistent shifts. Keep in mind these are issues with stock engine applications; there’s little chance of an NSG370 surviving for long with an LS conversion.

Kit Contents

The Quick Draw LS Transmission and Adapter Package for 2012-2017 JKs includes everything you need to bolt a GM LS or small-block to a TR-4050, including the transmission itself! The transmission is BRAND NEW, not a remanufactured or rebuilt unit, and is backed by a comprehensive warranty from Tremec. The supplied bellhousing will bolt to any LS-based engine as well as earlier GM small-blocks, while the opposite end of the supplied transmission has the correct spline and bolt pattern for the stock or heavy-duty replacement (such as an Atlas II) transfer case. Here’s the full lineup:

  • Brand New Tremec TR-4050 5-speed, warrantied by Tremec.
  • Brand new bulletproof Quick Draw Brand GM LS / small-block bell housing.
  • Clutch Fork
  • Pivot ball
  • All necessary bolts to attach bell housing to engine and transmission
  • Pilot bearing
  • Clutch release bearing
  • Shifter relocation bracket, lever, and ball
  • Transmission cross member bracket










Additional information

Weight350 lbs
Dimensions48 × 40 × 28 in