Degreaser then hot water as hot as possible
Hi Shane
But if the fluid you drained out didn't seem to have much in the way of dirt, grit or water. I think I might just go with Kero spin the wheels one at a time to work the diff gears and turn the drive shaft. Then just drain it and see what the drain looks like if it is just dark fluid with no chunks or grit then skip the water. Let it drain for a long time then just refill with correct gear lube and call it good. Just keep an I on the color and texture when you check the lube level.
If the gears are well coated in old lube you might consider waiting on this project until the truck is ready to drive as driving for a couple of hours is probably the best way to get all the moisture out of the differential.
When I did it sprayed in the degreaser mix of Gunk and Kero turned one wheel and the drive shaft to get it spread around then ran hot water through it with the drain out and turning the wheels both sides and and the drive shaft until the case felt warm then took a plumbing fitting to hitch an old hose type hair dryer up and just let it blow through the case for a couple of hours to really dry the insides out turning a wheel of the drive shaft every now and then.
Refilled the case with new rear axle lube per the manual. Then drive the thing around.
The CMP differentials seem to run cooler than some of the US Military Stuff. My CMPs after an hour driving average only 30-40F over the air temp. So air temp of 21C will get you 41 - 53 C which takes awhile to drive out any moisture.
Cheers Phil
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