Knowing what your car comes from the factory is an important part of upgrading. No point in buying a complete trac lok assembly if your rearend already has one but it’s just tired and needs to be rebuilt. There are two ways to figure out what you’ve got in the car
Door Tag:
The easiest way to find out what your rearend has is finding your door tag on the driver’s side door normally near the door latch. Under the barcode you’ll find a bunch of codes and abbreviations. The AXLE code is what were interested in. Find that and look in the list below
- 2004+:
- 1 – 2.73 conventional (non limited slip)
- 4 – 2.73 conventional (non limited slip)
- 5 – 3.55 conventional (limited slip)
- C – 3.27 (limited slip)
- F – 3.55 (locker)
- 1998-2003:
- C8 – 2.73 conventional
- 58 – 2.73 conventional
- AZ – 3.08 conventional
- JY – 3.08 conventional
- MY – 3.08 conventional
- Z5 – 3.27 conventional
- X5 – 3.27 (locker)
- 9E – 3.27 (locker)
- R2 – 3.55 conventional
- 55 – 3.55 conventional
- DK – 3.55 (locker)
- 56 – 3.55 (locker)
- Pre 1998:
- 8 – 2.73 conventional
- 8M – 2.73 locker
- Y – 3.08 conventional
- YZ – 3.08 locker
- 5 – 3.27 conventional
- 5E – 3.27 locker
- 2 – 3.55 conventional
- 2k – 3.55 locker
Axle Tag:
Get under the vehicle and on the rearend cover there should be a small rectangular metal tag that looks like this 
If you’ve got for example a 3 08 then you’ve got an open differential. If you’ve got a 3L08 then you have a locker.
