Because a 2000 Ford F-350 is a complex vehicle it can be difficult to troubleshoot what may be causing transmission problems. Two troubleshooting methods to use are to listen to the noises the truck makes and pay attention to the feel of the truck as you drive.
Inspect the transmission modulator when the F-350's transmission has an erratic shifting feel to it. The modulator may be leaking fluid into the vacuum system of the transmission. If the modulator works properly, look at the transmission fluid level and type to ensure they are correct. Then check the transmission filter to see if it is clogged or dirty.
Look at the clutch assembly and clutch disc when the truck has a grinding sound as you change gears. The clutch pressure plate may be worn or damaged and need to be repaired.
Locate the Ford's driveshaft when the truck has a knocking feel as you drive it. The driveshaft may be loose, bent or unbalanced.
