Shift Pointers: No ball, no reverse
Yoram Levy from Israel gave us a call with a 2022 Chevrolet Traverse using a 9T65 that suddenly lost reverse. He had found a check ball missing in his valve body which he points out in figure 1 (above). Figure 2, below, shows how bad the plate was where this ball passed through. GM usually
Shift pointers: A 4T65-E that wants to move in Park and Neutral
When conducting ATSG seminars, as we are usually covering a specific piece of tech, we’ll often tell attendees that if they put this together wrong, they should let us know what happens. Just recently, Ricky Hodgkinson from AACTION Transmission did just that. He was kind enough to share an incident he recently had with a
Shift Pointers: Reassembling GM pumps with cam failure
For the past several years, GM has used a binary positive displacement vane type pump. The compact design allows for it to be utilized in off-axis applications such as the 8L90 transmission and the third generation 6T40 transmission. Figures 1 (above) through 4 display a view of this style pump in the 6T40 applications. The
Transmission slipping in fifth gear: An elusive cause of a common problem
Sometimes, finding the cause of a complaint isn’t as straightforward as one would expect; sometimes, these causes can be very elusive.
From one problem to the next: When a simple solution becomes complicated
A 2007 Chevrolet Express 3500 comes to our shop with a concern of no reverse and very little forward movement. A quick check of codes reveals the following: P0171 Fuel Trim System Lean B1 Po174 Fuel Trim System Lean B2 P0218 Transmission Fluid Overtemp P0300 Engine Misfire Detected P0455 Evap Leak P0753 1-2 Shift Solenoid
6F35: A classic bolt intrusion
I remember the first time I took a phone call from a shop that had a GM 4L60-E with a complaint that it felt like it was bound up in both reverse and drive. I you got into the throttle a bit, it would move but with a terrible noise. After the Park Pawl was
Japanese CVT no-move conditions: Failsafe or defective TCM?
The Japanese Automatic Transmission Company produces a continuously variable transmission (CVT) known as the JF016/17E, which has been fitted behind 2.0L to 3.5L engines worldwide. Here in the United States, there is a light version called the CVT-8LT for 4 cylinder applications (JF016E) and a heavier version called the CVT-8HT for V-6 applications (JF017E). Nissan
GM 10L80: A new kind of pump noise
How quickly time passes by. The GM 10L80/90 transmissions began production in 2017, meaning that we’re closing in on six years of this transmission being on the road. Many who work in the dealerships have become privy to the immediate failures that occur in this unit. And now, with some of these transmissions coming out
Common failures on the GM AW55-50SN
GM’s AW55-50SN, otherwise known as the AF33 transmission (figure 1, above), is known for its placement in vehicles including the Chevrolet Equinox and Captiva, the Pontiac Torrent and the Saturn Vue. Versions of this transmission can also be found in SAAB, Volvo and Nissan vehicles. This unit began being produced in 2000 and ended production
A misleading code: Finding the right solution to the right problem
In having the privilege of presenting at Worldpac’s Supplier and Training Expo in Orlando Florida earlier this year, I met a couple of instructors from the Daytona State College who attended my seminar: Beau Bosman and Casey Knecht. During my presentation, I covered an issue with an Allison 1000/2000 that had the converter clutch cycling
A Chevy Volt making noise
There is a Preliminary Information (PI) paper published by GM regarding a concern with 2011 to 2013 Chevy Volt using a 4ET50 transmission. The PI paper explains that some customers may comment on a whistle, scrape or whine type noise while driving that may be more noticeable during regenerative braking. Technicians may find this noise
Common problems with uncommon solutions: 6L45 no-move or slipping forward
A 2010 3.0L Cadillac AWD CTS using a 6L45 transmission comes into the shop with a no-forward complaint. This particular vehicle is known for having the output shaft suffer from fretting, in which the output shaft to transfer case input shaft spline will strip and cause a no-move (figures 1 and 2). Sometimes, due to
