Don, if you remove the inspection plate on the bottom of the bellhousing & the clutchbrake is o.k., then check the clearance between the throwout bearing and the clutchbrake, it should be 1/2 in. If it is more, the clutch will need adjusting in the pressure plate by turning the adjusting ring with the clutch pedal depressed, it will take 2 people unless you can use a stick or a rod to hold the pedal down. I made an adjustable tool with a piece of pipe and a piece of allthread that would slide in the pipe and adjust to the right length with a nut on the allthread,[ i used 1/2 allthread], placed between the pedal and the seat frame. Once you get the 1/2 in clearance, you adjust pedal free play by adjusting the linkage from the pedal to the arm on the bellhousing. I hope this helps you. Also, if you go to Roadranger.com ,they have service manuals that can be downloaded . .Eaton/Roadranger has the Spicer medium& heavy clutch line. you can also get service info on the eaton axles and roadranger transmissions. I would guess that you probably have a Spicer clutch, it's about the most popular. All the Macks I've been around had Spicers