2002 Trailblazer Transmission

The 2002 Chevrolet Trailblazer is the second model year of the first (and only in the U.S.) of GM’s once popular midsize SUV.  Almost without exception, the transmission that came in these trucks was a 4L60E.  The only exception ever was the Trailblazer SS that would come in later model years.  Now, depending on what … Read more

PO700 Code

The PO700 trouble code is a code thrown out by an automatic transmission whenever it detects that there is trouble.  It is a general code.  This means that it should be accompanied by some other code that should tell you the specific problem.  PO700 is and OBDII code and not just GM. If you are … Read more

4L60E VS 4L80E Differences   

There are many differences and a few similarities between the 4L60E and the 4L80E transmissions.  If you don’t feel like reading a whole article on it the main differences between the two transmissions come down to two things; their actual physical size (the 4L80E is bigger) and the amount of horsepower that they can handle … Read more

2003 Chevy Trailblazer Transmission

The 2003 Chevy Trailblazer was built on the same platform as the Colorado and GMC Canyon twins.  They were both rear wheel drive and used the same drivetrain components (for the most part).  Trailblazers used the 4L60e across the board regardless of which engine was in front of it.  But, these particular versions of the … Read more


  The GMPT 4L60E is a GM automatic transmission.  Some 4L60E’s will have this stamped on the case, usually on the bellhousing portion.  The GMPT itself stands for General Motors Powertrain.  It’s similar to the way that MD8 was stamped onto the 700R4. GMPT Folklore. Many enthusiasts see this stamp on the case and get … Read more

Torque Converter Replacement

Replacing a torque converter is relatively easy to do. Getting to the thing is an entirely different story. There are many reasons that you may wish to replace it. Maybe your transmission is slipping? This site is geared toward the performance crowd (well a little bit), so we are will cover stall speed and torque … Read more