It’s Been a Good Run: The Last Product Change for the 4L60E
by Steve Garrett
members.atra.com www.atra.com
Since we now have an IMS, the design of the manual shaft, detent spring, and the park rod also needed to change.
Figure 1 I
t’s safe to say that the 4L60E has probably paid for many shop owners and technicians kids’
college education. Wonder how I can make such a claim? Take a minute and look back to 1993 when the 4L60E was introduced. Then think about how many 4L60E transmissions your shop has repaired or rebuilt during the last 18 years. It’s a staple in the cash flow equation for most transmission shops and its employees. Well it’s sad to say, but its time
has about come to an end. Like many things in life, the 4L60E will soon drive off into the sunset. Unable to run with the new kids on the block, this old war horse will likely disappear in the next couple years. As many of you are aware, the 4L60E has seen massive drops in pro-
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duction numbers as the focus moves to its 6-speed replacement. With that said, the 4L60E family of transmissions (4L60E, 4L65E, 4L70E) made some pretty significant changes in its last run at glory. You’ve probably noticed that when
you pull the oil pan off a late model 4L60E, a few things are missing, and a lot of what you see looks different. The changes had nothing to do with quality or reliability: They were simply implemented to reduce costs by remov- ing hardware. The updates were implemented for
most models in 2009 with full imple- mentation in 2010. The changes are significant in many areas and will affect the interchangeability of some of the 4L60E parts. So let’s take a look at the updates:
• Transmission Fluid Pressure Switch Manifold TFP or PSM eliminated
• Neutral Safety Backup Light Switch NSBU or P/N eliminated
• 3-2 Downshift Solenoid elimi- nated
• Abuse Valves and hardware elim- inated
• Wiring harness updated • Controller updated (pin changes)
The PSM was eliminated, so the
valve body and its passages also under- went major changes. The 3-2 down- shift solenoid and its related valving were eliminated. The abuse valves and the hardware associated with the abuse valves were eliminated. The P/N, NSBU switch was eliminated from the outside of the case.
GEARS January/February 2012
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