Honda Car Forum

I 'm driving? What happen if I change gears while I'm driving automatic car? Will it damage transmission?

Im not sure on the d4 and d3. But shifting to neutral overdrive and drive will not damage it. But put it in reverse and you will have little parts of transmission everywhere.

If your transmission has the D3 then D4 the D with a O around it it is a 4 speed automatic with overdrive hence the O around the D. If it does not have the D with an O around it then you have no over drive, and you have a 4 speed car. If you shift from D4 to D3 it would be like down shifting in a Manual Transmission but with out a clutch.

Not as long as you don't,shift into reverse,whilst going forward..As for down shifting,why would you??















You can do it,but only slows you down,D4 is cruising mode & D3 is basically for hill climbing & the















like,so it doesn't keep changing up & down all the time,putting excessive load on the clutch plates.















Hope i helped you a little??Good luck.Stay well & happy..Enjoy your motoring..

D4 is the transmission going into all 4 gears. D3 limits the transmission to 3 gears. D3 give you better braking if your towing something. nothing will happen "bad" will happen if you shift gears while driving. theres a sensor that wont change the gears if the RPM's will be at redline or over redline if you downshift into a different gear. hope that helps you some. if you still have questons you can email me.

On your dash board it ill show P R N D4 D3 2 1















All that it is really is a 4 speed automatic. D3 is just drive technically and the D4 works like your overdrive. Mine has problems shifting in the cold so I always put it all the way down to 1 then just work my way up to D4.