Could be. Check the level first. If that is ok, then maybe a trans filter kit will do the trick. Could be clogged. Always try the simple stuff first. You might be surprised. If none of the simple stuff works, then there might be a trans issue. And for that, there is no fix except replacement.
check your transmission fluid, if it is low it will slip
The recommended automatic transmission fluid for the 2005-2007 Mustang is Mercon V automatic transmission fluid
Low or dirty transmission fluid Transmission bands are worn
In the fluid chamber
You can add transmission fluid to your 1969 Mustang transmission through the dipstick holder. Using a funnel will make the job easier.
According to the 2002 Ford Mustang Owner Guide : 3.8 liter manual transmission fluid ( Motorcraft MERCON automatic transmission fluid ) 4.6 liter manual transmission fluid ( Motorcraft synthetic MERCON automatic transmission fluid )
The fluid can foam and cause slippage and/or blow out seals.
The dipstick cover is labeled Transmission Fluid. Transmission fluid on a 2000 Ford Mustang is added in the neck of the dipstick tube after the dipstick has been removed.
put fluid in differential or have someone replace your syncros if its a manual
my car has been slipping in the transmission would it be the that the transmission is bad or is the filiter and the transmission fluid needing changed?
Motorcraft MERCON automatic transmission fluid in the manual transmissions on a 2004 Ford Mustang ( according to the Owner Guide )
In the 1993 manual transmission Mustang the capacitie is 5.6 pts.