Get a free scan done at Autozone to see if any trouble codes are stored in the PCM.
If 4th speed is slipping, reverse should be affected as they share the same clutch and usual causes are bad clutch 'O' rings, unless the fluid level is low. Trans would have to be rebuilt.
The filter is maintenance free and replacement means to disassemble the trans assy.
Tuesday, September 21st, 2010 AT 8:42 AM