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Thread: Irs fluid capacity

  1. 03-12-2020, 11:19 AM #1
    Jeff's First FFR
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    Question Irs fluid capacity

    Hi all,
    Well, I drained the diff and refilled ti with Motorcraft 75W85 plus 4 oz XL-3 friction modifier. I was watching the fill hole for overflow. It took TWO QUARTS and nothing overflowed. I thought the spec is 1.6 quarts. What gives? It is a 8.8 center section with 3.55 gears. OEM from FORD via Factory Five.
    Thanks in advance,
    Jeff
    Mk4 Complete kit with IRS, IRS brakes, Power Steering, 302 mounts, 302 headers, TKO, 2 Rollbars, Leather seats,
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  2. 03-12-2020, 11:57 AM #2
    Railroad
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    You are probably in the wrong hole.
    Axle level?
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  3. 03-12-2020, 12:54 PM #3
    chjort
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    I had the same experience when I drained and refilled mine. If you stick your pinky finger in the hole, you can probably feel that the liquid level is just below the hole. I called FFR and they said that as long as you had added the spec amount, you were good. They said if you have more in there than the spec, its not a problem.
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  4. 03-12-2020, 01:20 PM #4
    Jeff's First FFR
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    A case of "More is Better?"
    Sorta like horsepower? and cubic inches? and "How you measure dat"? ( If you don't know that one PM me.)
    Thanks,
    Jeff
    Mk4 Complete kit with IRS, IRS brakes, Power Steering, 302 mounts, 302 headers, TKO, 2 Rollbars, Leather seats,
    vintage gauges, polished stainless sidepipes, front and rear sway bars, all cutouts.
    Blueprint Engines 347 stroker; Tremec TKO 600; 3.55 IRS, 17" Bullitt wheels: 9" front 10.5" rear.
    Delivered Nov. 6, 2018. First start Aug. 11, 2019. First Go-Cart Feb. 21, 2020.
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  5. 03-12-2020, 01:22 PM #5
    Jeff's First FFR
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    Every thing level. I'm pretty sure I'm in the right hole. But...then...
    Mk4 Complete kit with IRS, IRS brakes, Power Steering, 302 mounts, 302 headers, TKO, 2 Rollbars, Leather seats,
    vintage gauges, polished stainless sidepipes, front and rear sway bars, all cutouts.
    Blueprint Engines 347 stroker; Tremec TKO 600; 3.55 IRS, 17" Bullitt wheels: 9" front 10.5" rear.
    Delivered Nov. 6, 2018. First start Aug. 11, 2019. First Go-Cart Feb. 21, 2020.
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  6. 03-12-2020, 02:07 PM #6
    edwardb
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    As stated, it will be slightly below the hole when the specified amount is added. If you put in the right amount, you're good.
    Build 1: Mk3 Roadster #5125. Sold 11/08/2014. Build 2: Mk4 Roadster #7750. Sold 04/10/2017. Build 3: Mk4 Roadster 20th Anniversary #8674. Sold 09/07/2020. Build Thread and Video. Build 4: Gen 3 Type 65 Coupe #59. Gen 3 Coyote. Legal 03/04/2020. Build Thread. Build 5: 35 Hot Rod Truck #138. Build Thread. Sold 11/9/2023. Build 6: Mk5 Roadster 30th Anniversary #11,258. Build Thread.
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