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troubleshooting drivetrain clunk
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dmac0923
Enthusiast
Mar 22, 2010, 11:53 PM
Post #1 of 6
(3783 views)
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troubleshooting drivetrain clunk
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2002 Ford Ranger XLT 4dr short bed
4.0L V6 Auto Trans 4x4
156,000 miles
upon accelerating from a stop i feel a thump/clunk in the drive train i believe. I dont hear any noise just feel it inside the truck. It will also happen while accelerating at around 50-60 mph and suddenly releasing the gas pedal. My interpretation of the thump is like something is rocking back with the torque of the acceleration
Ive have the thump since i had the truck and it has gradually become more pronounced. the problem at higher speeds is recent.
some repairs.
rear drive shaft U-Joints replaced 1 yr ago
transmission mount replaced 4 months ago.
neither have resolved the problem.
any ideas?
__________________________________________________
2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1
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steve01832
Veteran
Mar 23, 2010, 2:36 AM
Post #2 of 6
(3780 views)
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Re: troubleshooting drivetrain clunk
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Double check the u-joints to make sure they are tight and that they were installed correctly. If all seems ok, Ford has a TSB about this and has a different type of grease that is applied to the rear driveshaft yoke splines. One note, before separating the two driveshafts, make sure you put an index mark on each shaft so when you put it back together the index marks line up, or else you will end up with more vibrations as these shafts are balanced after assembly.
TSB number is 04-23-7 in case you want to Google it.
Steve
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 23, 2010, 3:30 AM
Post #3 of 6
(3779 views)
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Re: troubleshooting drivetrain clunk
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Just a something to add here....
If you have a 2 piece driveshaft, lube the splines. There should be a grease fitting for that. I've seen that cause noises like that quite often.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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dmac0923
Enthusiast
Mar 24, 2010, 1:05 PM
Post #4 of 6
(3765 views)
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Re: troubleshooting drivetrain clunk
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thanks for the help guys.
now is that TSB is that a repair done at the dealers cost like a recall would be??
The grease fitting for the 2/piece splines....is that normally external? or do you have to remove the accordion boot to get to it?
also if it helps anyone. The clunk is its worse when accelerating from a stop/ accelerating at speed while on an incline.
__________________________________________________
2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Mar 24, 2010, 3:07 PM
Post #5 of 6
(3759 views)
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Re: troubleshooting drivetrain clunk
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Found a sample pic of what MAY be there in some custom shaft.
In essence the shaft needs to adjust its length a bit with certain load so slips on an item similar to shown in pic. Not all do that and some may still have an OE plug (cheap plucks save a penny on a fitting) and it if can't adjust to loads it could bind, whip or if worn clunk. As luck has it when you are greasing a vehicle with one it's pointing up out of sight (Murphy's Law) so you may need both rear wheels up and spin the shaft to find some
T
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dmac0923
Enthusiast
Mar 26, 2010, 5:13 PM
Post #6 of 6
(3746 views)
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Re: troubleshooting drivetrain clunk
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thanks guys. im gunna try that TSB, gotta run to ford and get the service kit.
ill post an update when its done.
__________________________________________________
2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1
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