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Remanufactured Hummer H2 Transmissions

  • Learn about common Hummer H2 transmission problems
  • Everything you need to know when shopping for a Hummer H2 transmission for sale
  • How and when to buy a remanufactured Hummer H2 transmission

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Hummer H2 Transmission Problems & Solutions


Believe it or not, Arnold Schwarzenegger is responsible for convincing AM General to produce a civilian version of their military Humvee back in 1992. By 1999, General Motors had acquired the Hummer brand, and introduced a pair of polarizing SUVs to complement the already bonkers Hummer H1. The Hummer H2 was built under contract by AM General, using a collage of GM truck frames. This brazen beast weighed around 3-tons, yet it could drive through nearly 2 feet of water, climb a 60% grade, and drive right up a 16-inch vertical wall. Part of this Herculean capability comes from the 6.0L V8 / 4L65E transmission, or the more powerful 6.2L V8, paired with the 6-speed 6L80E transmission. Acceleration is glacial and the fuel economy is abysmal. But if you want a truck that can actually live up to its macho image, then the H2 is hard to beat. However, you might windup walking back from the middle of nowhere if you have Hummer H2 transmission problems. So let’s look at some of the most common 4L65E transmission problems and 6L80E transmission problems.


Common Hummer H2 4L65E Transmission Problems


Harsh or Delayed 1-2 Shift

One common problem with the Hummer H2 transmission is an unusually harsh or delayed shift from 1st to 2nd gear. There might also be a shake or shudder from the transmission at lower speeds. These Hummer H2 transmission problems are likely caused by a failed 4L65E 1-2 accumulator, which is a little plastic damper that is designed to absorb the excess pressure that builds inside the valve body during a shift. To extend the life of your Hummer 4L65E transmission, Street Smart Transmission installs stronger aluminum 1-2 accumulator pistons, then completely recalibrates the valve body for better fluid pressure control.


Common Hummer H2 6L80 Transmission Problems


Shift Problems and Overheating

The Hummer H2 6L80 transmission is a 6-speed automatic that has been ruggedized to handle the added torque of the 6.2L V8. But no matter how tough it is, you may still experience H2 transmission problems. Some of the most common are slipping between gears, hard shifts, soft shifts, overheating, and the complete failure to engage a forward gear. Many of these problems are caused by the pressure regulator system inside the valve body, which uses a series of springs, valves, and plastic check balls to control the flow of pressurized ATF. If any of these little components fail prematurely, you’ll experience one or more of the above symptoms. To correct this issue, every SST remanufactured Hummer 6L80 transmission is fitted with higher grade PR system components, and the valve body is completely recalibrated to improve fluid pressure control.

How to Solve Hummer H2 4L65E & 6L80 Transmission Problems


Solution A: Buy a Used Hummer H2 4L65E & 6L80 Transmission

If you want to get your Hummer back on the road/trail as quickly as possible, then you might’ve already considered buying a used Hummer H2 transmission from a local salvage yard. They’re relatively plentiful, and most will come with a 30-90 day warranty. But with all of the aforementioned design issues, you might have the same problems twice. Or worse. Plus, that junkyard warranty only covers the transmission itself, not the labor to fix or replace it.


Solution B: Buy a Rebuilt Hummer H2 4L65E & 6L80 Transmission

The next best option would be to get a rebuilt Hummer H2 transmission. These have lots of new parts, along with a 1-2 year warranty. However, most mechanics and transmission shops will use an OEM rebuild kit, which means you’ll likely experience the same premature failures as before. And that rebuilt transmission warranty may only be good at certain shops in a specific region.


Solution C: Buy a Remanufactured Hummer H2 4L65E & 6L80 Transmission

Since your Hummer H2 was designed to go anywhere, your transmission should be too. That’s why every remanufactured Hummer H2 transmission from Street Smart Transmission is not only thoroughly upgraded, but it’s also hot & cold tested on a dyno machine. This allows our technicians to fine tune the shift pattern, and break in all of the new parts so there won’t be any issues once it’s installed. Each of our reman Hummer transmissions is also covered by a 3-year/Unlimited Mile Nationwide Warranty (18-months/100,000 miles for commercial and heavy duty applications). Unlike the typical rebuilders warranty, ours will pay for parts and labor at any licensed repair shop in the U.S.A. Plus the coverage can be transferred if you sell the truck.

So don’t risk walking back from the middle of nowhere. Fix your Hummer H2 transmission problems for good, with a remanufactured 4L65 or 6L80 transmission from Street Smart Transmission. 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 Hummer H2 transmission.