7.3 clunk when accelerating from stop - Ford Powerstroke Diesel Forum
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Old 04-11-2014, 01:40 PM
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7.3 clunk when accelerating from stop

Automatic 2002 7.3 f350 here. When accelerating from a stop something in the drive train likes to clunk. I was gonna say stutter but that's a little misleading, its not like the trucks revving freely and then slamming into gear. It also happens when I'm braking into a complete stop. I was in some stop and go traffic today and had plenty of time to let it bug me. The clunk happens between 0-5mph. It doesn't seem to affect drivability just want to put a finger on what it may be. Torque converter? Driveshaft u joints? Typical 7.3 behavior? Thanks dudes
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Old 04-11-2014, 03:50 PM
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sounds like my problem. mine doesnt do it if i pull the rear shaft. tomorrow i will be replacing u joints and carrier bearing as they are shot
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Old 04-13-2014, 08:32 PM
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Probably just need to grease the drive shaft splines.
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Old 04-13-2014, 09:03 PM
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yep grease the drive shaft spline. Worked for me
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Old 04-13-2014, 09:06 PM
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There is a blue special plastic-like coating on the driveshaft splines that wears off after time, and a particular grease Ford sells that you can coat the splines with that remedies this, but you have to be careful and not use too much or you end up creating a "suction" lock on the shaft. I need to do mine...
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Old 04-13-2014, 09:33 PM
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Just had the same issue...it was the ujoint and carrier. It was so bad, it was almost embarassing
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Old 04-13-2014, 11:44 PM
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PTFE lubricant. i've tried replacing it with other types of grease and nothing else lasts nearly as long on sliding parts
https://www.fcsdchemicalsandlubrican...tegory=Greases
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Old 04-14-2014, 09:11 PM
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ya it is most likely the slip joint like everyone else says. just need a 7mm socket to get the driver shaft loose.
make sure you mark where you pulled it apart.

also sometimes the drag link clunks but this obviously isnt whats causing the clunk from the rear.
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