Difference between 4L60E and 4L65E Transmission

What are the major differences between the 4L60E and 4L65E transmissions?  If there were a one-word answer to this question it would be strength.  The 4L65E is manufactured to handle more torque than its counterpart.  They have an identical looking case.  For all intents and purposes the 4L60E became the 4L65E when GM upgraded some … Read more

GMPT 4L60E

  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