Why isn't my car accelerating in drive?

Answer 1

Well, since your question is so vague as to the type of car, type of transmission, I can only speculate you are having some sort of a transmission problem. If it is a automatic more than likely it will have to be completely removed and rebuilt or replaced with a working unit. Automatics have disc in them that rub together to transfer the power from the engine to the differential. Typically they wear out, sooner without having the Transmission Fluid regularly. If it is a manual, it is cheaper and easier to repair. There is a good chance that it just needs a new clutch disc and maybe pressure plate and throw-out bearing. They are much cheaper and easier to replace as typically the transmission does not have to be completely removed from the vehicle, and can be done by the owner with moderate to strong handyman abilities.