HarrisonF

My 2018 1500 said 90,000 for differentials, trans, and transfer case. 45k if under severe conditions. It also said 45k for 2500’s at the time. My 2020 2500 doesn’t say anything except for 45k for transfer case. So I’m taking that to mean 45k for diffs, trans and transfer case.

Yes, I was in my garage. Not on jacks or ramps. Front diff took 2.3 or so and was barely dribbling out. Rear diff took the remainder or the extra quart from the front, so .7 or so plus 3 other fresh quarts. So the rear is at about 3.7 quarts and was not dribbling out. It’s probably 1/8-1/4” below the fill hole. I don’t have a service manual. Where can I access that?

Thanks for the response. Where did you find where it says 1/4” below fill hole? My manual doesn’t say anything. I put like 2.3 quarts in the front diff for it to drip out. I’m assuming I’m over full now?

Does anyone know the process for changing differential fluids front and rear? I’ve got a 2020 2500HD 6.6 gas. The manual says “see dealer” for fluid amounts and type. The manual also makes no mention of drain and full procedures. Amsoil shows the fluid amounts for the front and rear. I changed the fluids and I have always filled until the fluid drained out of the fill hole. However, the amounts I just put in are different than what Amsoil says and another poster on the forum. Any help is greatly appreciated.

To the OP, did you get these factory from GM? Also, the wiring harness I need to plug into is already in the headliner?