Hi itisjustme,
It is normal for vehicle to roll back when stopped on an incline. If idling speed is 700 to 800 rpm, there is nothing to worry about just remember to use the foot/park brakes.
The only difference between D4 and D3 would be the fourth speed so you should see a difference in engine rpm at cruising when you shift from D4 to D3.
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Saturday, August 2nd, 2008 AT 12:14 AM