Which differentials are in my truck?

[GDahlbeck]

Can someone tell me how I determine which of the following differentials I have. I have a 2006 4X4 Quad Cab with a 6-speed manual. The front differential is stamped AAM but there is nothing on the rear. I've looked through the service manual and I can't figure out how to tell what I have.



Thank you



FRONT AXLE

² C205FD - MoparT Gear Lubricant 75W-90

² 9 1/4 AA - MoparT Synthetic Gear Lubricant 75W-90

² 9 1/4 AA EL- MoparT Synthetic Gear Lubricant 75W-90



REAR AXLE

² 9 1/4 - MoparT Synthetic Gear Lubricant 75W-140

² 10 1/2 AA - MoparT Synthetic Gear Lubricant 75W-90

² 10 1/2 AA EL- MoparT Synthetic Gear Lubricant 75W-90

² 11 1/2 AA - MoparT Synthetic Gear Lubricant 75W-90

² 248RBI - MoparT Gear & Axle Lubricant SAE 90



NOTE: Trac-LokT differentials require Limited Slip Additive in the lubricant. Trac-Rite™ / Trac-Rite EL™ differentials

DO NOT require Limited Slip Additive.

 

[RScaletti]

I believe if you have a diesel you have the AA 11. 5. At least that is how my 06 is setup. Not sure about tags or stamps, though. Others will chime in...

 

[AEdelheit]

9. 25 front, 11. 5 rear, 3. 73 was the only option with a 6spd IIRC. They are a helical gear type posi, no clutches so they do not need friction modifier. Should be a build tag under the hood or in the glove box that tells you what're truck came with.

 

[NavyDood]

9. 25 front, 11. 5 rear, 3. 73 was the only option with a 6spd IIRC. They are a helical gear type posi, no clutches so they do not need friction modifier. Should be a build tag under the hood or in the glove box that tells you what're truck came with.

To add to this, they are AAM axles and nothing more than 75W-90 is needed.