GM Transmissions
8L90 Transmission Problems: What Fails First Behind Real Power
Five things account for most 8L90 complaints: torque converter shudder, harsh or delayed shifts, slip under load, heat, and valve body or solenoid wear....
GM Transmission Problems: Common Issues in Cars and HD Trucks
You feel a slip on the 2-3 shift, a flare under load, or a shudder at highway speed, and you search "GM transmission problems." The first thing to know...
How to Identify Your GM Transmission by Shape and Numbers
A swap meet core with no tag. A project car with a transmission nobody can vouch for. A truck that has had two owners and at least one rebuild. Before...
4L60E Are They All The Same?
There have been several different versions of the 4L60E over the years. They started in the mid 1990’s and continued through the early 2010’s....
Why the TH350 Transmission Is Still a Favorite Among Classic Chevy Owners
When you talk about classic Chevy cars, the TH350 transmission always finds its way into the conversation. It’s not just a part. It’s a legend in its own...
GM 4L70E Transmissions
Like most AODs at the time, GM 4L70E transmissions were designed with lightened materials to support better fuel efficiency, 4 speeds, and...
6L80E and 6L90E Transmission Specs and Identification
The 6L80E and the 6L90E are close enough that people mix them up constantly, and different enough that putting the wrong one in a heavy truck is an...