Daughter in law's car with 84k miles, was nice runner serviced at correct interval's but Stacy doesn't know if gearbox oil has ever been changed. She had driven to shops, reversed out OK and then into drive. Made some noises and seemed unwilling to move. Recovery driver said probably engine coolant into oil circuit. Car driven minimal distance since and will go into 2nd or 4th but not 3rd.

1500. At 68 I am old world car savvy but have never worked on this model. Is it worth using Radweld say and draining and refilling gearbox? I asked son to check engine coolant level. With the engine cold he said there appeared to be no coolant loss so could it be just a sensor malfunction? They have 13 month old twins so we all would like to resolve this problem rapidly.

Thank you in advance to all helpful responders.