A Silver Bullet STREET SMART
by Mike Brown
members.atra.com www.atra.com
ATRA began reporting TSS
related problems, mostly because of
mismatching parts, starting in 2005
Figure 1
out the door. In this article we’re going to look at a common problem on the 4L60E, 4L65E, and 4L70E caused by a problem with an input speed sensor. ATRA began reporting TSS related problems, mostly because of mismatch- ing parts, starting in 2005 so these problems are nothing new. But there is a problem you’re likely to see and is simple to fix.
E 4
very once in a while it’s nice to have a silver bullet: a quick fix to get a problem vehicle
Before we do that, let’s start with
a little background: The input speed sensor wasn’t used on all 2006-2007 applications (figure 1), so there may be some confusion over build combi- nations for these units. Some of the parts between the ISS-equipped and non-ISS-equipped applications can’t be intermixed. A failure to identify the build com-
bination you’re working with may result in problems with line pressure, TCC operation or clutch apply or release.
Five design variations have
occurred between non-ISS applications and the final, fully functional ISS appli- cations. These changes include: • Redesigning the turbine shaft — Repositioning the seal rings on the shaft and adding an ISS toothed wheel.
• Redesigning the pump cover — Updating the passage design and passage position in the stator sup- port sleeve, and adding a boss to the cover for the ISS.
GEARS March 2012
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