flashing cel usually leads to needing a tune up, or a clogged cat.

the tranny, drop the pan change the filter add 8 new quarts of fluid. do not flush it if the fluid looks dark and stinks bad. or bye bye tranny asap most of the time.

maybe add 1 qt or lucas and 7 qts new tranny fluid.


any chance its slipping in and out of OD? 4 th gear hubs go bad in these trannys. 04 was hit or miss if it got the new upgraded hub or not from the factory.