4 Speed Issues
Fleet Mechanic
Joined: May 2009
Posts: 1,460
Likes: 6
From: Bay Area, Unfortunately
I mean it is cheap and you can do it at home. It is easier to do than a T18 or T19. These were used in med duty dump trucks, so unless it has been abused or run dry, I am wondering if it is the clutch or T/C. I have had a similar incident in which it would grab, then not and on and on. I rebuilt the recently rebuilt trans and T/C. Turned out the hub in the clutch disc sheared from the rest of the disc. It was a centerforce slutch.
Post Fiend
Joined: Dec 2007
Posts: 8,521
Likes: 16
From: Lost
I agree that the clutch could be trashed. Unfortunately, the only way to fully know, is dropping the trans and inspecting the clutch.
If the truck sat for an extended period of time, then was put back into service, the disc could easily fall apart, causing these symptoms.
If the truck sat for an extended period of time, then was put back into service, the disc could easily fall apart, causing these symptoms.
Thread Starter
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Senior User
Joined: May 2010
Posts: 350
Likes: 2
From: Spartanburg, SC
That is good to know. I'm somewhat sure the truck wasn't abused, so it has to be the clutch. The previous owner had replaced the clutch, drove it 5 miles and parked it! It sat for 3 years and thats when I came along. Not knowing much about transmissions and clutches, is it still something I can do?
If it were your truck, where would you purchase the clutch?
If it were your truck, where would you purchase the clutch?
Post Fiend
Joined: Dec 2007
Posts: 8,521
Likes: 16
From: Lost
The hardest parts of a clutch replacement is wrestling the transfer case off/on, and the trans out/in. It's possible to to drop them out together, but MUCH harder to get back in.
Not sure where I would purchase from, but I would look around for a high quality clutch "kit" that has the disc, pressure plate, throwout bearing, pilot bearing/bushing and alignment tool. Most retail parts stores will resurface the flywheel for either free or at a greatly reduced cost, if you purchase a complete clutch kit from them.
Having sat for 3 years, and then returning to service, I'd highly suspect the clutch disc has fallen apart. In humid areas, the disc can become stuck to the flywheel and/or PP, and when this occurs, it's a crapshoot whether it will last long after getting it unstuck. Usually, the fiber sections of the disc suffer from stress during the attempts to unstick it, and tend to fail rather quickly.
Not sure where I would purchase from, but I would look around for a high quality clutch "kit" that has the disc, pressure plate, throwout bearing, pilot bearing/bushing and alignment tool. Most retail parts stores will resurface the flywheel for either free or at a greatly reduced cost, if you purchase a complete clutch kit from them.
Having sat for 3 years, and then returning to service, I'd highly suspect the clutch disc has fallen apart. In humid areas, the disc can become stuck to the flywheel and/or PP, and when this occurs, it's a crapshoot whether it will last long after getting it unstuck. Usually, the fiber sections of the disc suffer from stress during the attempts to unstick it, and tend to fail rather quickly.
