The 4.0 pushrod started life as a 2.8 with gear driven camshaft. Yours
is also gear driven and should last the life of the engine. 190K is
great, time to save those bucks and opt for a 2004 with 0.0 miles.
That's my take on it.
The 4.0 OHV does indeed have a timing chain.... as well as a hydraulically
actuated chain tensioner and a separate chain guide. I haven't heard of
anyone experiencing a timing chain failure nor have I ever been asked to
replace a chain on a 4.0 OHV. It appears (on the outside, at least) that the
chain may last the life of the motor.... which appears to be a long, long
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