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Thread: What's the 4.0 distributor upgrade?

  1. #1
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    What's the 4.0 distributor upgrade?

    '91 4.0, dizzy is fawked. I can see my it literally wiggling around & the lockdown is tight. I read somewhere there's a GM HEI upgrade, but can't remember if it's for the old non HO engine or it applies to this engine too. Anyone school me on this? Or if it's all hype and I just need to replace this one?
    ....-Noltz
    '91 Frankenheep Edition. 4.0, 4" BDS, Richmond 8.8, 35" KM2's, Titan 12k, ... gone.
    '95 4Runner SR5. Air-Lift bags, OBA & 8K Winch, DD... gone.

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    No HEI swap for the 4.0L just grab a new one from your
    local auto parts store they are fairly cheap for a remaned
    one.
    1989 Jeep MJ: 4.7L Stroker, 4WD Swap, 97+Conversion, RC Long Arm Upgrade Kit, 35x12.5x18 Mickey Thompson MTZ's, WJ D30, WK SRT8 Rear D44 w/approx. 8" Lift
    1983 Jeep CJ7: SOLD

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    What's the 4.0 distributor upgrade?

    Cool. Thanks!

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    i'm not sure but would the ford big cap 4.2 upgrade fit the 4.0 dizzy ??? i only have 4.2 dizzys here but i have the big cap for it ...that and a better coil works awesome on the 4.2

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    i have my 4.2 Dizzy running on my 4.0

  6. #6
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    Quote Originally Posted by ReversePhase View Post
    i have my 4.2 Dizzy running on my 4.0
    did you notice any difference between them ?? if the caps fit on the same then i don't see why the big cap won't work put that with the coil CTD has for sale and that would be a good upgrade ...
    Attached Thumbnails Attached Thumbnails i6capcomp.jpg   dualcomplete.jpg  
    Last edited by lemon; 12-24-2012 at 05:11 PM.

  7. #7
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    the bigger cap helps to control cross fire with a higher output coil ..

  8. #8
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    Your options are:

    1. factory
    2. HEI (GM)
    3. TFI (Ford)
    4. HEI/TFI hybrid

    I would just put the factory one back in for simplicity

    Here's an awesome writeup

    http://www.ifsja.org/forums/vb/showthread.php?t=19440
    http://www.ifsja.org/forums/vb/showthread.php?t=19440

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