Customer Support - (813) 235-0800 Call Us Text A VIN#
Mon-Thu 9AM-8PM  |  Fri-Sat 9AM-5PM EST

Remanufactured Mercury Mariner Transmissions

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

Get A Transmission Quote

Mercury Mariner Transmission Problems & Solutions


The Mercury Division was conceived in 1938 as a ‘medium priced’ premium car brand, that was intended to bridge the price gap between Ford and Lincoln. To achieve the desired price point, Mercury vehicles consisted of existing Ford models that were modified with more upscale interior and exterior treatments. One of these “flashy Fords” was the Mercury Mariner, which was a luxury version of the Ford Escape. It featured a chrome-laden, avant-garde exterior, and a plush 2-tone cabin. Four cylinder and V6 power were available, however no manual transmission was offered. Instead, all Mariners up to the 2008 model year were fitted with the 4-speed CD4E automatic transmission. This gearbox did a fine job when it was brand new, but problems usually started as the miles racked up. So let’s look at some common Mercury Mariner transmission problems, and see what you can do about them.


Common Problems with the Mercury Mariner CD4E Transmission


No-Shift or Delayed Shifts

One of the most common Mercury Mariner transmission problems are delayed gear changes, or no shifts at all. This is often caused by a failed CD4E shift solenoid, which can completely sideline your little SUV. These little plungers are used by the computer to shift gears by changing the path of the pressurized fluid inside the valve body. To extend the service life of your remanufactured CD4E transmission, each one receives new solenoids which are bench tested prior to installation. Then the entire transmission is dyno tested to ensure that each component functions properly.


Unusually Harsh Shifts and/or No Forward/Reverse Engagement

Another Mercury Mariner transmission problem is having hard or harsh shifts, which is usually followed by no forward/reverse function. This issue stems from a poorly designed CD4E pressure regulator valve, which lives inside the valve body. When it starts to go bad, the computer will boost the internal line pressure, resulting in the hard shifts, and severe damage to the clutch drums and other key components. To correct this design flaw, every SST remanufactured Mercury Mariner transmission receives a redesigned PR valve, upgraded servos, stronger bushings, and the entire PR system is recalibrated to improve fluid pressure control.


Low-Speed Shudder/Shake and/or Slipping Between Gears

This is the third most common Mercury Mariner transmission problem, and it comes from a failing torque converter. As the bearings start to go out, you can experience a shudder or shaking at low speeds. The transmission may also refuse to go into overdrive and/or slip through the gears. To correct this issue, every remanufactured Mercury Mariner transmission is shipped with a completely remanufactured torque converter, which has been fully tested to ensure the correct balance and concentricity.


How to Solve Mercury Mariner Transmission Problems


Option A: Buy a Used Mercury Mariner CD4E Transmission

Transmission repairs are expensive, so many people will opt to a buy a used Mercury Mariner transmission from a local junkyard. But that used CD4E transmission may have, or will soon develop some of the problems we listed above. Which means you could eventually have more CD4E transmission problems to contend with. Plus, that 30-day junkyard warranty will only get you a replacement transmission, not the labor cost to install it.


Option B: Buy a Rebuilt Mercury Mariner CD4E Transmission

Another option is to have a mechanic or transmission repair shop rebuild your existing gearbox. However, that rebuilt Mercury Mariner transmission may not get the updated components that it needs to overcome those factory design flaws. So it may wear out just as fast as the original did. Plus the 1-2 year rebuilder guarantee may only be honored by a few shops, which will do you no good if you have transmission problems on a trip.


Option C: Buy a Remanufactured Mercury Mariner CD4E Transmission

The engines that Ford put in the Mercury Mariner are actually quite reliable. So if you don’t scrimp on your transmission, you could be driving that little SUV for a long time. To do this, you’re going to want a remanufactured CD4E transmission from Street Smart Transmission. Not only is it modified and upgraded to exceed OE specifications, but its fully tested, tuned and broken-in to ensure that nothing will need to be adjusted once it is installed. It’s also given a   3-year/Unlimited Mile Nationwide Warranty (18-months/100,000 miles for commercial and heavy duty applications) that will protect you from transmission repair costs (parts & labor), so long as the fix is performed at a licensed repair shop in the lower 48-states.


So if you’re ready to fix your Mercury Mariner transmission problems permanently, then give us a call at 1-866-812-7560. Or click here to check on the price and availability of a remanufactured Mercury Mariner CD4E transmission.