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<blockquote data-quote="JerryD" data-source="post: 441972" data-attributes="member: 17662"><p>You'd probably have better responses over on Chris' other site, <a href="https://wrangleryjforum.com/" target="_blank">https://wrangleryjforum.com/</a></p><p></p><p>That said, you should look for the casting number below the distributor and above the oil pan. The casting numbers will be raised or recessed, not stamped.</p><p></p><p>1. 1st digit - the year (e.g., 4 = 1994)</p><p>2. 2nd and 3rd digits - the month (01-12)</p><p>3. 4th and 5th digits - the engine type/fuel system/compression ratio</p><p> (MX = a 4.0L 8.7:1 compression ratio engine with multi-point fuel injection system).</p><p>4. 6th and 7th digits - the day of the month of engine build (01-31). </p><p></p><p>Year............Casting No</p><p>1987-90......53005535 (8933002665)</p><p>1991-95......53008405</p><p>1996-98......53020569</p><p>1999-04......53010449</p><p>(source: <a href="https://www.greatlakes4x4.com/threads/everything-4-0l-casting-parts-differences.661/" target="_blank">https://www.greatlakes4x4.com/threads/everything-4-0l-casting-parts-differences.661/</a>)</p></blockquote><p></p>
[QUOTE="JerryD, post: 441972, member: 17662"] You'd probably have better responses over on Chris' other site, [URL]https://wrangleryjforum.com/[/URL] That said, you should look for the casting number below the distributor and above the oil pan. The casting numbers will be raised or recessed, not stamped. 1. 1st digit - the year (e.g., 4 = 1994) 2. 2nd and 3rd digits - the month (01-12) 3. 4th and 5th digits - the engine type/fuel system/compression ratio (MX = a 4.0L 8.7:1 compression ratio engine with multi-point fuel injection system). 4. 6th and 7th digits - the day of the month of engine build (01-31). Year............Casting No 1987-90......53005535 (8933002665) 1991-95......53008405 1996-98......53020569 1999-04......53010449 (source: [URL]https://www.greatlakes4x4.com/threads/everything-4-0l-casting-parts-differences.661/[/URL]) [/QUOTE]
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