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Hey guys, I just picked up a new style (08-09) rear differential cover for my 07. First thing I noticed is that the new Ribbed aluminum cover is at least 1/4 inch thicker than the stock tin cover. Will there be enough thread on my stock cover bolts or do I need to source new bolts.

Also, how much gear oil will it take, and is there a special oil everyone likes to use ?

Thanks
 

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I am pretty sure everyone is getting longer bolts... not sure on the grease (oil)
 

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7 pints for a SRW including additive for the LS if you have it. Just get a good synthetic and fill till it comes out the fill port. I find it easier to fill from the VSS port but you still need to open the fill port to get to the right level.

Yes you do need longer bolts.
 

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The new bolts you need are 1-1/4" x 5/16-18. You should easily be able to find some grade 8 hex bolts or socket caps in that size.
 

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The new bolts you need are 1-1/4" x 5/16-18. You should easily be able to find some grade 8 hex bolts or socket caps in that size.
Correct.

I was able to find a stainless allen headed cap screw and stainless washers at the local real hardware store. They really look great on the new cover.

I used 3 quarts of Mobil 1 and one tube of Trans X friction modifier and it filled it to the fill port.
 

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Hey guys, I just picked up a new style (08-09) rear differential cover for my 07. First thing I noticed is that the new Ribbed aluminum cover is at least 1/4 inch thicker than the stock tin cover. Will there be enough thread on my stock cover bolts or do I need to source new bolts.

Also, how much gear oil will it take, and is there a special oil everyone likes to use ?

Thanks
Are the newer covers better? If they are where would be a good place to find one?
Thanks,
Bri
 

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The newer covers are better in that they don't rust. Just look around for a price, you should be able to pick one up for $50-60. Do get stainless bolts to avoid electrolysis making a mess of things.
 

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The newer covers are better in that they don't rust. Just look around for a price, you should be able to pick one up for $50-60. Do get stainless bolts to avoid electrolysis making a mess of things.
This. The new ones are made out of aluminum, as opposed to tin, and they also have ribs/fins to help with cooling. They do not add any extra capacity just cooling ability. I got mine from Tousley for around $55 shipped. Picked up the socket caps and high collar lock washers from Fastenal.

Also grabbed a few Nord-Lock washers to check them out. Anybody ever used these before?
 

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Here's a crappy cell phone picture for those who don't know what the new Ford covers look like.

Speaking from experience in towing heavy with this truck, the cover makes a signifigant difference in temperature.

 

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Ive been itching to do this. Its a good upgrade and well worth the time and money for it.
 

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I know this thread is old but I was searching for info and want to know can I use Ford's xl-3 friction modifier with Redline's 75w140 gear oil?

Also just to confirm I need 3 quarts of the gear oil and a 4oz bottle of friction modifier to top it off?

THANKS.
 

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...and a gasket if you're replacing/removing the cover.
 

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I believe you use a rtv silicone to seal the cover. I haven't heard of a gasket being used.
 

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I am glad this thread resurfaced. I didn't know about this quick and easy upgrade!
 

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Here's a crappy cell phone picture for those who don't know what the new Ford covers look like.

Speaking from experience in towing heavy with this truck, the cover makes a signifigant difference in temperature.

How much of a difference in temperature before and after installing the aluminum cover?
 

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What about the front diff. ? Are the 08 ones alum. Up front too?
 

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Anyone have a part number handy?
 

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Anyone have a part number handy?
Parts at Tousley ford has always been good to me in knowing what im talking about if I dont have a part#. Call them up you may not need a part number.

Sent from my DROIDX using AutoGuide.Com Free App
 

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Good idea, thanks!
 
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