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Remanufactured Jeep Wrangler Transmissions

  • Learn about common Jeep Wrangler transmission problems
  • Everything you need to know when shopping for a Jeep Wrangler transmission for sale
  • How and when to buy a remanufactured Jeep Wrangler transmission

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Jeep Wrangler Transmission Problems & Solutions


As the spiritual successor to the legendary Nazi-busting Willys Jeep, the Jeep Wrangler TJ and Jeep Wrangler JK had big shoes to fill. Both generations stayed true to their ‘go anywhere’ heritage by offering no compromises when it came to off road capability, and rugged build quality. Power as always, was supplied by either a 4 or 6 cylinder engine, and buyers could finally get a 4-speed automatic transmission starting in 2003. The Jeep 42RLE transmission was intended to give Wrangler owners much better fuel economy and power delivery than the outgoing 3-speed automatic. However, age and mileage can cause some rather severe Jeep Wrangler transmission problems, which we’re going to look at now.


Common Problems with the Jeep Wrangler 42RLE Transmission


Slipping and/or Delayed Shifts

A very common Jeep Wrangler transmission problem is slipping and/or delayed shifts. There are several reasons that this can happen, and Street Smart Transmission has taken steps to correct these issues. For example, on every remanufactured Jeep Wrangler transmission, the 42RLE transmission pump has been completely remanufactured with upgraded line bore bushings to improve fluid transfer from the torque converter, thus improving shift quality and reducing wear on the torque converter. The torque converter itself has also been remanufactured, then tested to ensure balance and concentricity. Stronger bushings are used throughout the transmission to provide more balanced fluid pressure, and reduce the conditions for slippage. The valve body itself is also modified with a recalibration kit, upgraded servos, accumulators with aluminum pistons (instead of plastic), and a redesigned pressure regulator valve. All of these changes help to eliminate the numerous OE design flaws, and give you a Jeep Wrangler transmission that you can trust.



One of the Jeep Wrangler transmission problems that seems to plague most owners is overheating. As all of those metal bits move about inside your transmission, they generate friction which translates into heat. The transmission fluid then absorbs this heat and carries it to the radiator where it’s expelled in a special cooling chamber. However, situations that put strain on your Wrangler JK 42RLE transmission or Wrangler TJ 42RLE transmission, like towing, stop-and-go traffic, or off-roading, can increase this heat and overwhelm the cooling system. When this happens, serious internal damage can occur to the valve body, clutches and seals. 42RLE overheating can also cause slipping, delayed shifts, torque converter and overdrive issues, and ‘Limp Mode’ (the transmission gets stuck in 2nd gear). Each SST remanufactured Jeep Wrangler 42RLE transmission has been upgraded to overcome many of the OE design flaws, but we strongly recommend installing an auxiliary transmission cooler to prevent premature wear to your new gearbox.


How to Solve Jeep Wrangler Transmission Problems


Solution A: Buy a Used Jeep Wrangler 42RLE Transmission

Although it might seem cheaper to buy a used Jeep Wrangler transmission, that isn’t always the case. You see, most Wrangler TJ 42RLE transmissions and Wrangler JK 42RLE transmissions have inherent design flaws that eventually lead to problems. So that used 42RLE transmission sitting in your local salvage yard will likely give you the same problems down the road. And that 30-day junkyard warranty doesn’t cover labor charges.


Solution B: Buy a Rebuilt Jeep Wrangler 42RLE Transmission

A more logical solution would be a rebuilt Jeep Wrangler 42RLE transmission. But most mechanics and rebuild shops use OE master rebuild kits, so you’ll have the same factory flaws, and the same service life expectancy. Plus, that 1-2 year warranty may only be honored by a few shops, which will do you no good if problems arise when you’re on a trip.


Solution C: Buy a Remanufactured Jeep Wrangler Transmission

If you want a gearbox that’s as tough as the rest of your truck, then you’re going to want a remanufactured Jeep Wrangler 42RLE transmission from Street Smart Transmission. Not only has it been modified to outlast the original specification, but it also comes with a 3-year/Unlimited Mile Nationwide Warranty (18-months/100,000 miles for commercial and heavy duty applications). This transferable coverage will pay for any transmission repairs (parts and labor) that are performed at any licensed repair shop in the country. So you can take your Jeep on any adventure with confidence, because your ruggedized transmission is built to last, and it comes with a nationwide warranty to boot. To learn more, give us a call at 1-866-812-7560. Or you can click here to check on the price and availability of a remanufactured Jeep Wrangler transmission.