I've never fully rebuilt a 4.0, so I can't provide any insight. It's cool that there's Jeep guys here tho!
Since we're talking Jeeps, here's a pic of my 04
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"Those poor souls have made the fatal mistake of surrounding us. Now we can fire in any direction"
1970 Trans Am RAIII 4 speed
1971 Trans Am 5.3 LM7
1977 Trans Am W72 Y82
1987 Grand National