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The overdrive provides approximately a 20% rpm drop. It should engage at 35-40 mph if on level road and light throttle.
If you are up to 50 mph and aren't sure, let up on the gas while watching the tachometer. If at 2500 rpm when O/D engages, the RPMs should drop by 20% or down to 2000 rpm.
If you do not have a tachometer, getting one is a worthwhile upgrade, as is a voltmeter. The tach kit" (look on eBay) consists of a large tach which replaces the large clock in the cluster, a small clock, a bezel and 3 little rubber "feet" that hold the clock into a 2 x 2 square spot left of the center A/C vents, and a 3-wire harness that connects the tach to the clock.
The harness provides the clock with a constant hot lead, ground lead, and lighting lead. In the wires behind the cluster you should find the factory-installed lead from the coil for the tach. I think it is red/white and has an insulated female connector on it. Installing it to anything other than the tach WILL damage whatever it's hooked to.
When the O/D relay gets old and cranky, like mine, and the up arrow stays lit after starting the engine, use the heel of your right hand and deliver a moderate whack to the right corner on the coin tray. The relay is mounted right behind there. Works for me.
If you go in with a "new" relay, keep in mind that the one for an automatic tranny is NOT the same as for a manual tranny.
Good Luck,
Bob
:>)
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