I would say the car would be under geared at 21/87. I have been running 22/23T pinions on 6.5 motors.
I would recommend the Tekin RS Pro speedo and a Tekin Redline S 6.5 motor.
I have just put this set up in my Durango, it runs much cooler than the Nosram ESC and motor i ran previous to this.
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