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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

drive train question???

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Old Dec 15, 2015 | 08:50 AM
  #1  
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drive train question???

what could cause an obnoxious knocking noise underneath the cab??? im thinkingmaybe tranny mounts but not sure... any thoughts.
 
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Old Dec 15, 2015 | 09:52 AM
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Bad Bad Leroy Brown
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Could be a lifter, but alot of ticks/knocks can be attributed to leaks in the exhaust manifold or pipes under the cab.
 
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Old Dec 15, 2015 | 10:24 AM
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Dying u-joint
 
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Old Dec 15, 2015 | 10:26 AM
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ok i may have discribed it poorly, when i put the truck in first and let off the clutch and give it gas, right before i release the clutch completely, the truck bounces a little bit. or shake more or less. but as soon as i let off the clutch totally it goes away and drives fine. and it seems like it only does it if i let of the clutch quickly, but not always
 
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Old Dec 15, 2015 | 10:47 AM
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Aha!!! Big chance your clutch is shot, mine was doing that before it started slipping, it was worn down to the rivets!

Do check/replace your ujoints while in there because they come out anyway during the big job.
 
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Old Dec 15, 2015 | 11:02 AM
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i just did my clutch lol like 3 months ago.. i really hope that isnt it but do you think it could be a ujoint??
 
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Old Dec 15, 2015 | 11:25 AM
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Climb under and try to turn the drive shaft, if you can move it (play in the u-joints) you need to replace them. This is a lot easier than looking at the clutch so you can narrow down the options.
 
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Old Dec 15, 2015 | 12:09 PM
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Also take a good flashlight and see if you have a broke motor/trans mount.
 
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Old Dec 15, 2015 | 02:00 PM
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My easy method of checking motor mounts, block wheels and apply emergency brake. Have helper stand Beside truck while you place it in drive/1st, and rev it a little. Repeat for reverse. No lifting of either side of engine, all's well.
 
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Old Dec 15, 2015 | 09:25 PM
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Just another possibility but have you checked the radius arm bushings? I let mine go to long and would clunk loudly going down gravel road.
 
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Old Dec 16, 2015 | 07:07 AM
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ok i checked the u joints and they were good, when i took the tranny off i dont remember them being in bad shape... so im gonna check motor mounts and radius arm bushing.. now another quick question... either my transmission or rear end is making a sound almost like someone is dragging a piece of metal on the ground in 1st and 2nd and a little in 3rd. im not sure where it is exactly coming from... could that be the result of low fruid in either??? has anyone ever had this happen to them
 
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Old Dec 16, 2015 | 08:16 AM
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Drivers side motor mount.
 
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Old Dec 17, 2015 | 06:59 PM
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ok thanks guys i will try and check the motor mounts
 
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