Home

Models, Books, and Shirts
Gifts For The Car Guy!
Share
Car Movies
Trans Am Parts
Car Television
FAQ
Links
Search Trans Am on Ebay
Magazines
About my '78 T/A
Books That I have Read
Rare Pontiacs
Tips & How To
Old Car Ads
Web Surfers Cars
Car Posters
Where to Buy/Sell your T/A
Gallery
Old Trader Ads
Other websites that I have created
Site map
My Photographs

 

Differential Codes

 

To find the differential codes take the rear cover off the rear end and look for some numbers stamped into the outside of the ring gear. If your gears have not been changed these codes may be on the right axle tube next to the differential.

1979 Codes

Code  Open/Limited slip Gear Ratio
2PJG Open 2.41
2PSG Limited Slip 2.41
2PHG Open  2.56
2PTG Limited Slip 2.56
2PCG Open  3.08
2PWG Limited Slip 3.08
2PDG Open 3.23
2PXG Limited Slip 3.23
2PY Limited Slip 3.42

1980 

Code  Open/Limited slip Gear Ratio
2PJ Open 2.41
2PS, 5PV Limited Slip 2.41
2PH Open 2.56
2PT Limited Slip 2.56
2PC Open 3.08
2PW Limited Slip 3.08
 
1998-2010

78blackbird@thepontiactransampage.com
Feel free to drop me a note. * I am looking for some good articles for the third and fourth gen birds. If you have any that you would like to see on this site send them to me and I will post them on my site.     

  • The information in here is just an outline.
  • The author claims no responsibility for the info contained in these pages. 
  • If unsure of any tip or modification seek a professional for the job.
  • In some states this may violate pollution laws
  • Check with your state on the laws.
  • Not affiliated with Pontiac or General Motors