im upgrading my rearend cover, which fluid for stock 160k mile rear end??? - Ford Powerstroke Diesel Forum
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post #1 of 25 Old 02-17-2017, 05:14 AM Thread Starter
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im upgrading my rearend cover, which fluid for stock 160k mile rear end???

My rear end is starting to make some noise when turning tight corners after its heated up. It hasn't been serviced in 80k miles, so I'd like to upgrade the rear end cover as well. Is the Magtec still the best one out there and which fluid should i use for the stock 160k mile rear end. Should I go to 75w-140 Amsoil and how much friction modifier due i use in the bigger cover?

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post #2 of 25 Old 02-17-2017, 05:58 AM
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Most 75W140 Synthetics have friction modifier in it so you won't need to add any extra. I used Valvoline last year and have no complaints.

Ford went to an upgraded aluminum cover with fins in 2008. I think mine was around $75 and works just fine. You'll also need to upgrade your hardware as the aluminum cover is thicker.

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post #3 of 25 Old 02-17-2017, 06:01 AM
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Found a pic of the upgraded Ford cover that I installed:

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post #4 of 25 Old 02-17-2017, 06:16 AM
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All Amsoil all the time.
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post #5 of 25 Old 02-17-2017, 06:22 AM
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I used valvoline 75w-140 full synthetic. Found it at Napa for like $9 a quart. My rear end had 120k on it from the original owner before it was changed. Like others said probably 99% of the synthetics have the friction modifier already in it.

If you do the 2008 rear dif cover you need new nuts n bolts too. It's a different method then the oem 1999-2007 rear ends cover etc.

Some company's sell a kit that's a bit overpriced but... saves you all the research hassle and trying to find the hardware at a local store etc.
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post #6 of 25 Old 02-17-2017, 06:41 AM
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It will say if it has the limited slip additive in it or not. I used Lucas last time, not sure if the Valvoline is FULL synthetic or not, Amsoil, Mobile 1, Motorcraft would be.

The additive is to stop chatter, but technically it reduces the effectiveness of the LSD (makes the clutches slip some) so I would probably just fill with a good full synthetic and see if'n she chatters. If so pull out a little fluid and put in a bottle of the Motorcraft LSD additive (4oz)

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post #7 of 25 Old 02-17-2017, 09:20 AM
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Just put a trutrac in it while you're in there, that way you can save money by not having to use any friction modifier

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post #8 of 25 Old 02-17-2017, 09:40 AM
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When I changed my rear diff oil, I never found a need to use any friction modifier. Always used Amsoil Severe Gear and still have a new tube of their Slip Lock additive untouched. So my suggestion....don't add any until you know it is needed.

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post #9 of 25 Old 02-17-2017, 11:47 AM
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I purchased the valvoline full synthetic. It stated it had the lsd additive and no chatter so far.

I have yet to see a full synthetic that doesn't have an addative. Also Autozone and o Riley is a total rip off in my area. Napa and Walmart sold the same stuff for way way cheaper.
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post #10 of 25 Old 02-17-2017, 04:55 PM Thread Starter
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Well i decided to go with the Mag-hytec 6 quart cover with Schaeffer's performance 75w-140 synthetic. I'm actually looking forward to see how the fluid does since they make excellent motor oil.

Have any of you hooked a temp sender to the housing that works with the SCT livewire programmer?

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