Those are the primary reasons that the 4L60E fails in reverse. Is it possible that the engine was revving fast when reverse was engaged? Alternatively, was the vehicle moving forward? If so this can cause the sun shell to fail. If reverse suddenly fails with no warning, it’s very likely to be the sun shell. Almost like it wasn’t quite biting al the way. It should also have started to feel a little weird for a bit before it failed. When they go out it often leaves a putrid smell.
#2003 4l60e servo assembly diagram manual#
The clutches in an automatic transmission wear just like the simple clutch of a manual transmission. If there was an egg smell for a while when engaging reverse, it’s more than likely going to be the friction bands/low reverse clutch pack.
If you are an observant person you might be able to help yourself identify which problem caused the 4L60E to lose reverse. In this example it’s the sun shell that has caused the issue. Here’s a short but sweet YouTube video that covers some of the most common issues that cause the 4L60E to lose reverse. It is known to snap where the splines meet the shell itself. Sun Shell- A broken sun shell will cause the 4L60E to lose reverse. If the valve body ends up warped, or if the gasket fails, it’s entirely possible that the gear won’t engage.īooster Valve- A bad booster valve can leave you without reverse in a hurry. Valve Body Issues- A bad valve body can make the reverse gear not work in the 4L60E.
If the pan looks good, and the fluid looks clean, than it’s likely not going to be the low reverse clutch causing the problem. Typically, when any of the clutch packs wear out, they begin to drop debris in the transmission pan. Low Reverse Clutch Pack- The most likely part of the 4L60E to have failed in reverse is the low reverse clutch pack. Below we will cover the most common problems that cause reverse to fail. The General Motors 4L60 (also known as the THM700R4) has been with us now for over two decades and, along with the completely computer controlled 4L60E version, has quickly become one of the most widely used late-model GM rear wheel drive transmissions found in cars and lighter-duty pickup trucks. Having no reverse can be a tricky issue, especially if you happened to park against a wall. THIS IS THE MOST COMPLETE OEM WORKSHOP REPAIR MANUAL FOR GM HYDRAMATIC 4L60 4L60E TRANSMISSION. Please Contact Us to purchase a proper speedometer gear for your application or if you are unsure if your extension-housing will need to be reused.One of the most common problems with the 4L60E is that the reverse gear will go out. In most cases, you will be required to swap your original extension-housing (this will NOT void your warranty).
Certain vehicle specific extension-housings may not be available with this unit. This Monster 700R4 Transmission does not come equipped with a new Speedometer Gear. *Special Note: If you are planning a direct transmission swap it is recommended to re-use your existing extension-housing and speedometer gear. The 30% overdrive will give a 30 to 40% increase in gas mileage on the road when compared to a 3-speed automatic transmission. The 4L60E has a 3.06 ratio in first gear, which is 20% lower than most transmissions. NEW 29 ELEMENT HEAVY DUTY FORWARD INPUT SPRAG RECALIBRATED VALVE PLATE FOR SHIFT FIRMNESS MODIFIED INPUT SUN GEAR TO INCREASE FORWARD PLANETARY LUBRICATION MODIFIED SUNSHELL DRIVE GEAR TO INCREASE REAR PLANETARY LUBRICATION SUPERIOR HIGH PERFORMANCE SHIFT REPROGRAMMING KIT We recommend using a Snapon-OTC or Dealer scanner for this procedure. For the system to operate properly, ECM computer code(s) must be cleared prior to initial drive of the replacement transmission. All Monster transmissions are thoroughly inspected, blue printed and quality checked to ensure that your investment is completely flawless. The Mega Monster Transmission features: the latest technology in our industry with only the best internal components for increased strength, dependable performance and monster torque capacity. In either mode, you get a racetrack shift that bangs through the gears giving you all the right to say "Eat My Shift!". Equipped with a Reprogrammed Automatic valve body, most units allow you to shift the vehicle into each gear change or, by placing it in the drive position, remain fully automatic. It is ideal for vehicles powered by engines producing up to 500 horsepower(450 torque) with a naturally aspirated system using pump gasoline. Time commitments may vary as this is a custom built transmissionĮngineered to Dominate, the 4L60E Mega Monster transmission is tough enough to withstand the rigors of even the toughest street machines delivering tire-spinning shifts race after race.
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