Shift pointers: 6T40 neutral drop

Shift pointers: 6T40 neutral drop

A 2011 1.8L Chevy Cruze showed up to the shop with a slipping generation one 6T40 transmission. Engagements were good, but on a quick initial road test it would flare to neutral when the 1-2 shift was commanded. Then it might drop in and hold second gear or shift to third gear and seem okay.  It was initially diagnosed as an internal 2-6 clutch problem, so the unit was pulled and disassembled. The unit appeared to be in good condition internally and no problem was found when the 2-6 clutch and piston were inspected. 

The technicians decided to open the valve body for a closer inspection, with the idea being to replace the 2-6 solenoid (PCS-4) or TECHM if the valve body proved to be good. By doing this, they discovered the real problem: The filter plate was damaged as seen in figure 1 (above).

The way in which the plate was damaged allowed Actuator Feed pressure to intrude into the Pressure Switch 2 Circuit when it was not charged. Pressure Switch 2 is pressurized in first, third, fourth and fifth gears. This pressure would mix with and influence actuator feed pressure levels, but it was when the shift into second took place that pressure switch 2 circuit became open to an exhaust. This caused actuator feed pressure to drop, negatively influencing solenoid function. This became quite evident when the transmission transitioned from first into second gear.

Shift-Pointers-Cruze-Figure-2-Web

Figure 2 (above) is a pick pointing to the actuator feed port in the filter plate, and right below that is the pressure switch 2 port. Subtle damage like this can go easily unnoticed. The chances of this exact same damage ever occurring again may be slim, but if your transmission has a sudden drop to neutral on a shift, remember to look at the filter plate.

You May Also Like

10L80 and 10R80 pump gear differences

You may have seen an article in the August 2023 issue of Transmission Digest called “GM 10L80: A new kind of pump noise,” which goes over how the front cover housing in the 10L80 is fitted with a converter drive gear and idler gear. The idler gear drives the pump’s driven gear, and is press

You may have seen an article in the August 2023 issue of Transmission Digest called “GM 10L80: A new kind of pump noise,” which goes over how the front cover housing in the 10L80 is fitted with a converter drive gear and idler gear. The idler gear drives the pump’s driven gear, and is press fitted to this housing by way of a ball bearing (see Figure 1). It is this bearing that goes bad, making the aforementioned new kind of pump noise. 

Shift Pointers: What to do when the 62TE TRS tab breaks

How frustrating it is when on a hot summer day, as you go to open a nice cold can of your drink of choice, and the tab breaks off? You are outside, away from any tools to remedy the problem quickly. It now requires a MacGyver mentality looking around at the resources available to get

Going the extra mile: Proving your transmission repair suspicions

A 2003 Honda Pilot with a five-speed three-shaft transmission came into our shop with a customer concern that the vehicle had no power, and the “D” light was flashing. I first did a scan for codes to see what it came up with, and the scan tool returned four DTCs: P1298 (ELD voltage high), P0135 (H02S

RRfeature-1400
Diagnosing Ford 10R60, 10R80 and 10R140 series speed sensor issues

Ford 10-speed 10R series transmissions utilize four two-wire, Hall-effect sensors — TSS, ISSA2, ISSAB and OSS — for providing speed signals to PCM or TCM. They are supplied nine volts by a PCM or TCM and assist in the control of clutch apply/release timing that is used in determining shift quality, including TCC. Related Articles

Jatco JF613E transmission quick reference material

For those working on the Jatco JR613E transmission, a widespread transmission with plenty of applications, the following should be a helpful guide. Related Articles – Outgrowing the walls: The story of EVT Transmission Parts – Spotting different 68RFE designs through the years to avoid issues – Valve body and component suppliers: A comprehensive list Domestic

Other Posts

Shift Pointers: Failures caused by incorrect tire sizes

For years ATSG has produced a wide range of issues related to improper tire sizes on vehicles. Even under-inflated tires have been known to cause issues. Problems such as premature failure with an active 4WD transfer case will occur with incorrect tire sizes. Related Articles – Understanding lube flow control valves in Toyota/Lexus UA/UB80 transmissions

Shift-Pointers-Jan-Figure-1-1400
Understanding lube flow control valves in Toyota/Lexus UA/UB80 transmissions

The Toyota/Lexus UA80 and UB80 transmissions first came out in 2017 in Highlanders and Siennas. The UA80 is used in V6 applications, and the UB80 is paired with four-cylinder versions. They have been called Toyota New Global Architecture type transmissions, and alternately referred to as the “Direct Shift 8AT” eight-speed automatic transmission. This transmission was

Tasc-Tip-December-Figure-1---LFC-Valve-OE-Partial-Circuit-Diagram-1400
How reading through service bulletins can turn a technician into the customer’s hero

Over the last 28 years of being a technician, I have developed the habit of checking for and reading technical service bulletins at the forefront of the diagnostic process, especially when an unfamiliar vehicle exhibiting blatant or straightforward concerns comes into the shop. I have found many valuable nuggets of information while reading over these

Sometimes, you should sweat the small stuff

It’s a common phrase: There may have been a time when you worried about something, and someone who knew what you are going through said, “Hey, don’t sweat the small stuff.” Sometimes, this may be good advice. But other times, it may be wise to handle the small stuff before it becomes bigger “stuff.”  Related