Progressioning Trick - GM Ignition

When making a key for the trunk or door locks for GM automobiles, there is a method that most of the time will be faster then using the GM progression chart in which some locksmith companies know about.

When progressing a door key from the glove box cut of 3-2-2-3, the possibilities by progression are-First key: 11-31-42-53-55. Second key: 13-33-35. Third key: 22-24-44. However, by using Code Source, you will find when you go to the code series of the vehicle the following possibilities: 11-31-42-53. In other words, you should have a working key with the first progressioned key. This will save time and key blanks as well.

This trick should also work on Ford 8-cut systems when making an ignition key from from the door cylinder cuts. Here is an example for code series 0001X. For door cuts 1-3-2-1-2-1 with a progression chart you have possibilities of the first key being 12-13-23-33. Second key: 22-24-34-35. Third key: 32. With Code Source go to code series 0001X-1706X and find the bitting that matches to door cuts. With door cuts 1-3-2-1-2-1 the possibilities are 12-34. It will work on Ford 10-cut systems.