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  • Three different 258 flywheels?

    I noticed 4wd Hardware's catalog has three different flywheels listed for the AMC 258, and are all different part numbers.

    One says for a '72-'79, 232-258 6cyc

    Another one says '82-89 for 258 6 cyc

    Last one is for 88-90 258 cyc

    Does anyone know the differences of them off hand, and/or why they would be different? Thanks!!

  • #2
    If you go here, http://www.jeeptech.com/wiki/index.p...ory/AMC_258_I6
    you'll see there's a few differences in the 258's through the years.

    Noticably, the engine ratings (hp and torque) and the compression.

    The flywheels might be different weights.

    If I wanted to keep a 258 in mine, I'd sure like to replace it with that old wagoneer version rated at 150hp and 240 ft lbs.

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    • #3
      The early flywheel is prolly a 9 in clutch. I have a 90 YJ flywheel in my 85 CJ with a 78 engine and T4 trany. I also used the 90 YJ starter, kinda nice with the gear reduction unit on there. I was going to use an early flywheel that I had lying around when I pput in the 258, but it was a lot smaller (even though it bolted to the engine)

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      • #4
        Originally posted by tracraym
        The early flywheel is prolly a 9 in clutch. I have a 90 YJ flywheel in my 85 CJ with a 78 engine and T4 trany. I also used the 90 YJ starter, kinda nice with the gear reduction unit on there. I was going to use an early flywheel that I had lying around when I pput in the 258, but it was a lot smaller (even though it bolted to the engine)
        What was smaller? The starter or the flywheel? Thanks!!

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        • #5
          The flywheel was noticeable smaller, couldn't even see the ring gear through the hole for the starter. The flywheel was drilled for both the 9 inch and the 10.4 in clutch. I looked back at my notes and it looks like the flywheel I was uning was from a 65 Rambler with the 232. They used a smaller bellhousing bolt patter (narrower by one inch) untill about 71 or 72 I think.

          The YJ starter bolted right up to the CJ bellhousing and works fine, just some electrical mods because of the integrated solenoid.

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