Should I Drive on D3 or D4?

Press on the brake pedal when you are moving the shift lever from Neutral to another gear. Drive (D4) — Use this position for your normal driving. ... Use D3 to provide engine braking when going down a steep hill. D3 can also keep the transmission from cycling between third and fourth gears in stop-and-go driving.

Can driving in D3 damage your car?

actually no damage at all. For my car to cause damage driving around in third gear (5 speed manual) I'd need to be doing more than 90, and in the equivalent gear to your third (my fourth) I'd need to be doing around 130. Depending on where your redline is, you're likely higher.

What does D3 and D4 mean on a Honda Accord?

The D3 is. to tell the car to "Drive forward, starting with first gear and going no. higher than third gear." The D4 is to tell the car to "Drive forward, starting with first gear and going all the wayyyyyy to fourth gear." There. is some stuff in there about engine rpm's and forward speed and momentum.