Question about 1999 Jeep Grand Cherokee

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1999 jeep grand cherokee tacometer reading???

I recently got a 1999 jeep grand cherokee limted with the 4.0 v6. Compared to my past cars the rmp at certain speeds are higher then that of my others. I am not sure if the transmission is shifting to the final o/d gear or not. The o/d button/ light does not do anyhtign when traveling fast and am wondering if it is stuck in off mode. @ 70mph the tacometer reads 3000 rpm, where my other cars were about 2200 to 2500 at this speed. @ 50mph the tacometer is about 2000 rpm. Also at fast speeds when i accelerate the tranny does not shift down a gear. other wise the transmission seems to be working great. Is this all normal for a 99 JGC?

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Cruising rpm even after the OD has engaged has a lot to do with the differential gear ratio and tire size.
There will always be a variation between different vehichles due to that alone.
To see if the OD is working, at about 50mph, lightly touch the brake pedal. If the rpms increase for a moment then the OD was engaged. (touching the pedal momentarily disengages it...good thing to know when hill climbing!

Posted on Apr 27, 2010

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Posted on Jan 02, 2017

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