sounds more like the governor and/or shift solenoid's have failed or have stuck.
The 42 series boxes are pretty much bullet proof if not over abused and the front and rear bands are adjusted to specification at each gearbox service.
Did you use ATF 4 oil and did you put enough oil back into the box as it depends if it has a stock pan or a high capacity pan to how much oil is required on a filter change.
The 42 series boxes are pretty much bullet proof if not over abused and the front and rear bands are adjusted to specification at each gearbox service.
Did you use ATF 4 oil and did you put enough oil back into the box as it depends if it has a stock pan or a high capacity pan to how much oil is required on a filter change.
