Diff fluid overfilled possible with Motobuilt Covers.

[ffeggleston]

I just installed my rear differential cover made by moto-built. It doesn’t call for any extra fluid however it didn’t start coming out of the fill plug until around 2 1/4 quarts. Am I missing something here ? How could it take that much fluid ? Any help would be great thanks.

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[JeepOfTheseus]

Does it specifically say no extra fluid needed or you’re just wondering why it needs more?

Also do these have two fill plugs or one?

 

[ffeggleston]

It lists the fluid capacity and it’s the same as the stock. I am curious why it took so much fluid.

 

[ffeggleston]

And just 1 fill plug

 

[aFatBird]

Most of the time you go aftermarket with covers you should just start measuring the amount of fluid you put in.

 

[ffeggleston]

Understand that. However it doesn’t say anything about that. So I’m wondering how I got such an extreme extra amount in

 

[Vtur]

That's about 1/2 a quart more than stock cover. That might be right due to the cover design. It doesn't have the recessed ring gear fluid baffle like Dana's covers. That baffle is there to ensure that the gears has adequate fluid while turning, leaning, and concentrating it at the ring gear.

 

[Jaxmax]

Like above are saying, probably cover design uses more fluid, measure the old cover height of fill hole to the new cover 's height, if they are the same you should be good, perhaps even better as more fluid at same height might give a benefit. I put Dana covers on and they have two holes one standard and one for increased angle I believe......Jack

 

[Hootbro]

If you are sure your axle is perfectly level and the fill plug bottom edge is the same as the factory cover, I would not worry about it.

 

[bd100]

The level is probably more important than the quantity.

 

[ffeggleston]

Ya it was just odd. The front took the required specs yet the rear was a lot more. Like an extra pint. Fill hole is in exact location as stock.

 

[whiteglad]

I found that the Motobilt covers add capacity to achieve the same fill level. Stock level is about 5/8" below the fill plug on the Motobilt cover.

 

[RockJeep98]

M220 RBI (Model 44) Rear Axle – EDL Fluid Capacity: 3.06 Pints/1.45 Liters. The fluid should rise to the bottom of the axle tube or just above it so that it can flow to the axle bearings.

 

[kennyglm]

call motobilt

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