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Old 03-08-2010, 05:12 PM
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Rear end movement

1999 f250 super duty supercab..... f350 4 inch rear blocks

I bought this truck a month ago and ever since I bought it I have noticest when I come to a stop and take off I have what feels like movement in the rearend. I do not notice it unless I come to a complete stop. I have checked and found nothing loose in the rearend and was wondering if this could be normal in the springs and bushings???
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Old 03-08-2010, 06:14 PM
drperformance drperformance is offline
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Its normal axle wrap created by the shackles connecting the leaf springs. My 2009 does the same thing forget about it or buy a truck with coil springs in the rear.
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Old 03-08-2010, 07:07 PM
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My rear end gets lots of movement when I eat Mexican...Sorry I couldn't resist.

Axle wrap is one thing it could be. It can be combated in several ways. Some of them fairly cheap and some of them not so much.

Do you only get this when pulling a tralier? If so then it sounds like axle wrap. Taking off rather gently from a stop while unloaded shouldn't produce axle wrap.
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Old 03-08-2010, 07:11 PM
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my guess is your feeling the drive shaft slip joint "clunk" which occurs just as teh vehicle comes to a complete stop.

its simple to regrease the splines...
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Old 03-08-2010, 07:11 PM
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Could be a few things, like sagging springs, shot spring bushings, slop in the ring and pinion, worn u-joints, worn out shocks, a touch of axle wrap, or more likely a combo of all of the above. It's a 10 year old truck, things start to get loose after awhile.
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Old 03-08-2010, 07:37 PM
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Quote:
Originally Posted by drperformance View Post
Its normal axle wrap created by the shackles connecting the leaf springs. My 2009 does the same thing forget about it or buy a truck with coil springs in the rear.

That's what I was hoping to here..... This is the first truck I have had to do it is the reason I was asking, but with the 4 inch blocks I was assuming that it was normal.... This is my first Super Duty....


Much thanks bro,
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Old 03-08-2010, 07:41 PM
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Quote:
Originally Posted by texastech_diesel View Post
Could be a few things, like sagging springs, shot spring bushings, slop in the ring and pinion, worn u-joints, worn out shocks, a touch of axle wrap, or more likely a combo of all of the above. It's a 10 year old truck, things start to get loose after awhile.

I May try changing the bushing later on to see if it helps.... U-joints, ring and pinion check out fine.... It seems this truck was used to pull a heavy load so I was assuming it may be the bushing... everything seems tight when I check it out so I was hoping it was just normal movement.... I was also assuming the 4 inch blocks may play a part causing more axle wrap....

This is my first super Duty..... First with 4 inch blocks....

Thanks for the info,
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Old 03-08-2010, 07:45 PM
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Quote:
Originally Posted by Fordfanatic4life View Post
my guess is your feeling the drive shaft slip joint "clunk" which occurs just as teh vehicle comes to a complete stop.

its simple to regrease the splines...
I do need to regrease the splines they have a little play...... I may regrease them tomorrow to see if helps any...

But it don't feel like that it feels like the springs are twisting....
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Old 03-08-2010, 11:52 PM
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I had a truck with one bad shock out back that would do strange things like that. One side would compress and one side wouldn't. It was very noticeable when stopping or going over speed bumps, felt like the rear axle was pivoting under the frame.
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Old 03-09-2010, 10:25 AM
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I had a truck with one bad shock out back that would do strange things like that. One side would compress and one side wouldn't. It was very noticeable when stopping or going over speed bumps, felt like the rear axle was pivoting under the frame.

Interesting......

I was planning on changing the shocks at a later date but it may come sooner than later....

I have no problem at speed bumps it just feels like the rearend twists in one direction when I come to a complete stop and twists in the other direction when I take back off.....

It does not do it at a rolling stop I only notice it at a complete stop...

Actually feels like a wheel is loose and moving at stop and go.
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Old 03-09-2010, 01:26 PM
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You could have a wife/friend put it in and out of gear (fwd and reverse) and watch the rear axle mounting points, or relation of the wheels to wheelwells. Light power braking might induce some movement, too.

Use great care doing this - don't get run over.
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Old 03-09-2010, 03:42 PM
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Quote:
Originally Posted by SteveH-CO View Post
You could have a wife/friend put it in and out of gear (fwd and reverse) and watch the rear axle mounting points, or relation of the wheels to wheelwells. Light power braking might induce some movement, too.

Use great care doing this - don't get run over.
I have come to the conclusion it is axle wrap that I am feeling.....

I got out today and had my wife pull the truck back and forth as I watched the rear dif, springs, and bushing to find the bushing are tight but the springs (I believe) are the movement I am feeling....

I also used a grease needle and greased the drive shaft by sliding the needle under the boot and squirting grease.....


Much thanks to all,
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Old 03-16-2010, 11:27 PM
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I may have been wrong as to where the wrap was coming from. I was thinking it felt like it was coming from the rear but This afternoon I installed the front leveling leafs from Rough Country and it seems to have fixed the problem. When stopping it does not shift as it did before.
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Old 03-16-2010, 11:27 PM
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