Q: I changed the gearbox but the car is only moving in reverse and it needs acceleration up to 6000rpm to reach 30mph.

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I was having harsh shifts with my old gearbox it was not engaged in reverse at all,so i bought a second hand one. This one have very smooth reverse but on D it will move only 25kmph even if the engine is at it maximum i.e.8k rpm. Is the gearbox not good or is there any sensor problems. Plz help.

My car has 140000 miles.
My car has an automatic transmission.

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