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Senior Member
What is this in th IRS?
So I was looking at the rear of my IRS and determining how to fill it. As i was doing this I saw this "feature", yellow arrow pointing at it. Its machined, polished and I can't really tell if it needs a plug, or if something I haven't gotten to yet, goes in there... I have a complete MkIV roadster, delivered 1/20/23, with 2018 3.55 Complete IRS Diff, delivered from FFR as part of my kit. Any help is appreciated...
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The fill plug is just under the other end of your arrow.
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Senior Member
Originally Posted by
Junbug
So I was looking at the rear of my IRS and determining how to fill it. As i was doing this I saw this "feature", yellow arrow pointing at it. Its machined, polished and I can't really tell if it needs a plug, or if something I haven't gotten to yet, goes in there... I have a complete MkIV roadster, delivered 1/20/23, with 2018 3.55 Complete IRS Diff, delivered from FFR as part of my kit. Any help is appreciated...
Thanks... I was tracking that... I'm just trying to figure out what the hole is at the pointy end of the arrow... before I fill it and end up with a mess!
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I think its a manufacturing boss. either that or holds something on the Mustang that we dont have. No need to plug it. Its a dead end hole.
Mike
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Mine came fully serviced, brand new in the box
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Senior Member
You can stick a small screwdriver in it to see if it's 'blind' like Mike says, or open.
Last edited by rich grsc; 05-01-2023 at 07:19 AM.
Mrk III, 331 stroker, Borla stack injection, T5, 3:55 IRS, Power steering and brakes. Kleiner body & paint
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Senior Member
It is used for some type of sensor, but not needed for our use. My differential came from a 2019 Mustang and had the sensor plug still in place (which I left).
James
Mk4 Roadster #9974 - Picked Up 1/2021. Complete kit, Gen 2 Ford Coyote / TKX, IRS. Completed 9/2023
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Some models do come with factory coolers. I bet it is something related to mounting or feeding the cooler.
20th Anniversary Mk IV, A50XS Coyote, TKO 600, Trunk Drop Box, Trunk Battery Box, Cubby Hole, Seat Heaters, Radiator hanger and shroud.
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Senior Member
It's a temperature sensor boss. Some models have it, some don't
Gen 3 Type 65 Coupe builder
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Mine also has it. I didn't do anything with it, and it didn't leak when I added fluids.
MkIV Roadster build: Gen 2 Coyote, IRS, TKO600. Ordered 10/24/18. Delivered 1/29/19. Engine installed 8/8/21. First start 9/12/21. First go-kart 9/17/21. Off to paint 4/11/22. Back from paint 12/30/22.
Build thread here.
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Senior Member
Great! As always the forum is well informed and helpful. Thanks folks!
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