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  #13  
Old 02-12-2012, 06:38 PM
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The specs for diffs and t cases that I have had are always fill to the hole or just slightly under. I always fill to the plug, with the thicker oil and the fact that there is plenty of open room left inside the gear case aeration shouldn't be a problem.
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Old 02-13-2012, 07:46 PM
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Re: IMPORTANT: Changing front differential oil

My main concern with Aeration stems from the fact that from the factory, pre-lift, the diff's are in a "flat plain" so to speak, so the air voulume in them as designed for a certain voulume of oil would be sufficent for the oil to be "pumped" around in there with out excessive pressure and or heat. When you lift the vechile, and the lift kit drops the diffs, then tilits them towards the transfer case for proper driveline angles, the "hog head" end that I would think normally have some air or room is filled full of fuild, therfore the only area of escape is the tilted end towards the transfer case pointed up, and thats a smaller area of voulme for a bunch of oil to get thrown around in. The concept to me of overfilling the diff case is to provide enough oil for the proper "splash bath" that the pinion bearings require due to them being pointed up and the diff oil following gravity is now down in the ring gear area, right? I guess I should just call Superlift and gather their thoughts on this. I also suppose if I had mega bucks, I could just have a custom diff housing made with some type of better lubrcation system that could deal with the angle of drop that a selected lift kit would give. Thanks so much for replying, I am curious to see what others have to say about this in reguards to a lifted WK
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Old 02-14-2012, 12:20 PM
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Re: IMPORTANT: Changing front differential oil

I see your point, I didn't think about the diff angle change with a lift.
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Old 03-13-2012, 09:48 AM
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Re: IMPORTANT: Changing front differential oil

The factory manual specifies the fill level to be 1/4 inch below the fill hole, or else aeration of the fluid will occur. When gears run at high speed, the gear oil foams if you fill it up to the fill hole level. Gear oil is not compressible, but bubbles are, and direct metal to metal contact results, and bubbles act as an insulator so higher temps / oxidation of internal metals is accellerated This applies particularly to the Mopar fluid with friction modifier, while higher quality synth. fluids have less tendancy to foam, e.g. Mobil 1, Amsoil. RP
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Old 03-13-2012, 03:03 PM
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Re: IMPORTANT: Changing front differential oil

Awsome information! Thank you
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