How To Identify Type Of Differential

[Silverado_zach]

I recently bought a used 2004 2500HD Silverado 4x4, with the 4.10 gears and am trying to find out if I have locking front and/or rear differentials. If any one has any info on how to identify the type please let me in on the secret.

[ryank1]

Check your rpo codes for g80

[Silverado_zach]

Check your rpo codes for g80

 

 

I'm sorry, I am a complete newb and don't know what the rpo codes are.

[ZsTB]

RPO codes are on a sticker in the glove box. G80 is the RPO Code for Differential, locking, heavy-duty, rear.

 

RPO Codes

 

Chris

[Shaners]

The front diff is open. If the G80 code is found on the sticker in the glove box, then the rear diff would be a locker. These trucks don't have limited slip anymore. When the rear locks, it really locks...

[Silverado_zach]

Thanks for the replies, I will check this today. What exactly does the front differential being "open" mean?

[Ranger]

Open being the opposite of locking...It has no limited slip or posi-trac.