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  1. #1
    FEP Power Member
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    Default Turbo Coupe rpm's

    Have a 86 Turbo coupe with the auto tranny and was wondering what highway speed rpm's should be. Is 3500 rpm's normal at around 70 mph?
    Is this safe for the motor? Seems like the engine is screaming at that speed.
    '86 GT - weekend driver
    '86 Capri 5.0
    '86 Turbo Coupe
    '17 Mustang GT
    '23 BRONCO

  2. #2
    FEP Power Member mcb82gt's Avatar
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    Default

    That seems high to me, but its been awhile since i had my Turbo GT. Spin the tire one revolution and count the number of driveshaft turns. Will tell you what rear gearing is.
    Mike

    Now stang-less.

    88 Cougar 5.0

  3. #3
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    Wondering if there is a tag on the diff cover, will have to check? Would these have the smaller 7.5" rear end?
    '86 GT - weekend driver
    '86 Capri 5.0
    '86 Turbo Coupe
    '17 Mustang GT
    '23 BRONCO

  4. #4
    FEP Power Member 4-barrel Mike's Avatar
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    Default

    Not going into overdrive?

  5. #5
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    From what I thought was it has 3 speed transmission, C3?
    '86 GT - weekend driver
    '86 Capri 5.0
    '86 Turbo Coupe
    '17 Mustang GT
    '23 BRONCO

  6. #6

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    I think the 86 Turbo Coupes came with 3.45 rear gears.
    1985 Mustang GT (Mothballed...Desired restomod parts acquired...Top of my project list for my 2024 retirement!)

  7. #7
    FEP Senior Member
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    Sounds about right for a three speed trans. I guesstimated your tire size and came up with 3259 at 70mph with a 3.45 rear gear ratio.
    http://www.csgnetwork.com/multirpmcalc.html

    Yes, you should have the 7.5" rear if it is original.

    My V6 screams at today's highway speeds with the three speed and even 2.73 gears. I hate it.
    '89 XR-7 5 Speed
    '95 SC 5 Speed
    '91 Crown Vic P72 351W
    '97 Thunderbird
    '85 Ford LTD Squire

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