Originally Posted By: southernjeeper
Originally Posted By: CKN
Originally Posted By: southernjeeper
Change your rear DIFFERENTIAL fluid.
You will not believe how this oil is overlooked by owners on getting drained and refilled.
Those ring and pinion gears need oil that is not broken down completely, especially when TOWING, heavy stop n go traffic and water crossings (which we all know is a no no) unless you are asking for trouble.
Make sure you add the additive for the limited slip.
80w90
75w140
And so on
It smells terrible but change the fluid. 15,000 severe, 30,000 normal.
But who has a truck and drives normal/ideal. A truck is a workhorse not a show pony.
That's way too often dude.
Oil is cheaper than a new rear end or parts/labor.
I changed mine last year because it was a fleet truck. Tire wear and just knowing better than just driving it with how it was was not probably changed very often was why I drained it.
Amsoil is very expensive and would be worth it if I towed really heavy loads.
But I opted for Valvoline 75w140 full syn instead.
I didn't add the Mopar additive due to the bottle shows that it is already in the oil for the limited slip.
But I do have the additive now to add to the Valvoline. Mobil 1 full syn when I think the Valvoline cleans out any more crud as I didn't really check for fine metal shavings or grit.
Maintenance is far better than replacing gears and axle shafts.
Rear ends don't go out much these days-if they are not abused. Again-no one said anything against maintenance...but 15,000 mile change out is absurd.