Gravelly ZF
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Joined: Jun 2003
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Gravelly ZF
Low speed mild lugging of the engine elicits a gravelly noise from my ZF 5-speed in the F250 4x4. It can be a little growly at idle too. I changed the fluid and the old stuff looked pretty good. Still a little noisy though. The trans shifts fine and is quiet once underway. The truck does have 221 k on it. I used about 3.5 qts Chevron MD3 fluid for the change. Will additives help this?
Post Fiend
Joined: Oct 2003
Posts: 6,214
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From: New Jersey
Gravelly noise when lugging is usually the throwout bearing, pilot bearing, or worse case input shaft bearing right at the front of the tranny housing. The gravelly noise is due to the aforementioned parts (one, two or all) vibrating on the input shaft.
Also, you should be using Synthetic Mercon/Dexron III transmission fluid in the ZF's.
Additives rarely help since these parts do not get soaked by the fluid inside the transmission.
Also, you should be using Synthetic Mercon/Dexron III transmission fluid in the ZF's.
Additives rarely help since these parts do not get soaked by the fluid inside the transmission.
Posting Guru
Joined: Jan 2003
Posts: 1,412
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From: Munroe falls, Ohio
You have "lugging rattle" and "gear rollover"
From the ZF website:
"Lugging rattle":‘Rattle’ noise when taking off from a stop and driving at less than 1000 RPM. Avoid lugging engine
"Gear rollover":Noise disappears when engine RPM exceeds 1500 without depressing clutch pedal. Neutral rollover is caused by the engine firing pulses transmitted through the gear set. Some neutral rollover is normal on the 7.5L application. The dual mass flywheel on the 7.3L Diesel and the two stage clutch on the 4.9L & 5.8L should eliminate this concern on these engines.
From the ZF website:
"Lugging rattle":‘Rattle’ noise when taking off from a stop and driving at less than 1000 RPM. Avoid lugging engine
"Gear rollover":Noise disappears when engine RPM exceeds 1500 without depressing clutch pedal. Neutral rollover is caused by the engine firing pulses transmitted through the gear set. Some neutral rollover is normal on the 7.5L application. The dual mass flywheel on the 7.3L Diesel and the two stage clutch on the 4.9L & 5.8L should eliminate this concern on these engines.
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Joined: Jun 2003
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Sound like some of this noise is the nature of the beast. Frederick: Do you think the synthetic Mercon/Dextron fluid is going to work better? The MD3 is supposed to be a replacement for the old Mercon/Dextron. What if I simply ran a syn hypoid oil?
