I need some sound advice. I have an 1987 Nissan Sentra that I had the A/T Transmission rebuilt.The internal parts was in prestiage condiation. However the gaskets gave out in the Trans due to the car sitting 5 years before I got it. However, I have started having problems with it again, 400 miles later.
Driving at speeds around 45-55MPH their is a strange vibrating/humming sound. I have taken it back twice for that but, the mechanics can not find anything matter with either the trans or the car. Then yesterday, I took the car out on the interstate and the transmission started vibrating excessively (I can feel the vibrating in the gas pedal), revving way up before going in gear ( the car does not have an RPM meter) in stop and go traffic, and transmission started getting really hot and the metal case had light smoke coming off it due to being so hot. Once, I got to the location I traveled to, I discovered that the transmission had leaked out of a lot of fluid. I put in the cars transmission about a whole quart. This fixed the shifting problem sorta. The car still shifted hard all the way home and still vibrated, and still the trans got very hot after an hour or so of driving. Once I got home, I checked the trans fluid and discovered that it was very burnt looking and that I have trans fluid covering all the way back to the end of my car. alone with smelling burnt. That is the story, thus far.
Why can the mechanic not locate the problem? Does anyone have an recommendation on what is matter with the transmission? Anyone’s best guess on this being worth fixing/ covered by the shops warranty?
Thanks for any help or words of wisdom.