REAR END CLUNK! - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 12-08-2008, 10:30 AM Thread Starter
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REAR END CLUNK!

I have been noticing a clunk when i put my truck in drive or reverse. I did see my pinion moving up when it makes the noise. I know its probly not a good thing but do I need to tighten my pinion nut more or are the pinion bearings shot. Also there is no play in the gears.

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post #2 of 13 Old 12-08-2008, 05:07 PM Thread Starter
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bump!TTTTTTTT

1997 Ford F350 CC LB 4x4
2007 F350 axle/suspension swap
238/100 Full Force Stage 3 Injectors
H2E Turbo
Fully Built Trans with Triple Disc Billet
Tony Wildman Chip
Superduty IDM
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post #3 of 13 Old 12-08-2008, 05:13 PM
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I'd say your pinion bearing is shot but i would check the u-joints first. How do you know there is no play in the gears?

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post #4 of 13 Old 12-08-2008, 05:14 PM
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Are you sure it is the pinion that is moving up and down. I would be inspecting the u-joints first. As they are easier to replace then the pinion.

If there is no wear or damage to the pinion gear and ring gear. Then I doubt it is the pinion bearings being bad.

I would be more apt to remove the drive shaft and inspect the u-joints. Also while the driveshaft is out. Grab the yoke on the rear diff. Pull it up and down, in and out. If there is a lot of play then yes your pinion bearings could be bad.


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post #5 of 13 Old 12-08-2008, 05:17 PM Thread Starter
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I know I need to replace the u joint cause the sweek under load. I can see the pinion move up slightly when it clunks or I should say pops. I had someone put it drive.

1997 Ford F350 CC LB 4x4
2007 F350 axle/suspension swap
238/100 Full Force Stage 3 Injectors
H2E Turbo
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post #6 of 13 Old 12-08-2008, 05:19 PM
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I would say it is most likley the U-joint!

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post #7 of 13 Old 12-08-2008, 05:22 PM
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Quote:
Originally Posted by Chadahootchie View Post
I know I need to replace the u joint cause the sweek under load. I can see the pinion move up slightly when it clunks or I should say pops. I had someone put it drive.
The movement your seeing could be from the bad u-joint. If you know the u-joint is bad then replace it. As they only cost 15 dollars.

While the driveshaft is out, you can grab a hold of the yoke on the rear diff. See if there is a lot of play in it. That will tell you if that bearing is good or not.


A bad pinion bearing is going to cause damage to the ring and pinion gear. It will also cause excess play in the gears as well. Which could result in a complete rebuild of the rear end.


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2005 6.0 Crew Cab Long Box Lariat, current truck

2004 6.0 destroyed by contaminated fuel

2002 7.3L burnt
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post #8 of 13 Old 12-08-2008, 05:40 PM Thread Starter
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yea i guess so. I mean there is none to very little play in gears. The reason of concern is I thought I saw the drive shaft make a little extra rotation while power braking it and thought I might need to do something about it. But not to much damage can be do if there's no play in the gears. But the rear end probably don't like those 38's either.

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Leveled on 37s
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post #9 of 13 Old 12-08-2008, 05:47 PM
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Quote:
Originally Posted by Chadahootchie View Post
yea i guess so. I mean there is none to very little play in gears. The reason of concern is I thought I saw the drive shaft make a little extra rotation while power braking it and thought I might need to do something about it. But not to much damage can be do if there's no play in the gears. But the rear end probably don't like those 38's either.
You have 38's on your truck. So that means there is a lift. When the lift was installed was the driveline angle corrected. If not that will eat up u-joints.

So you need to replace the u-joints and check the driveline angle.


Your Actions Today, Decide Your Future Tomorrow

2005 6.0 Crew Cab Long Box Lariat, current truck

2004 6.0 destroyed by contaminated fuel

2002 7.3L burnt
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post #10 of 13 Old 12-08-2008, 05:52 PM Thread Starter
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Yea ill replace the u joint since the ones that are in it arnt greasable. The drive angle is perfect if anything I should put a shem to angle down the pinion a little, the driveshaft is straight off the axle. The shackle flip made it perfect.

1997 Ford F350 CC LB 4x4
2007 F350 axle/suspension swap
238/100 Full Force Stage 3 Injectors
H2E Turbo
Fully Built Trans with Triple Disc Billet
Tony Wildman Chip
Superduty IDM
5'' Straight Pipe 7'' custom sideways bed stack
Leveled on 37s
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