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Old 08-16-2018, 04:55 PM   #1
Fredb
 
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Default Wallowing...

Recently had the rear tires replaced and an alignment done and since then the handling had higher speeds is terrible. The back end wallows in turns and overall the unit feels very unstable at higher speeds 45-50+ (And even at lower speeds).

I have upgraded suspension on all four wheels (which prior to recent developments had been great

I checked the tire pressure and all in spec.

I purchased the same Michelin LTX tires as before

I checked the rear stabilizer and everything is intact... same with the leaf springs

Long and short I am at a loss for what could’ve happened to so dramatically alter the handling

Could it be the alignment? Perhaps needs to be tied in more?

Any and all suggestions welcome.
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Old 08-16-2018, 05:42 PM   #2
Pnwsquid
 
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Default Re: Wallowing...

What pressure are you running, front and rear?

I'd start with 75-79 read and 60-65 front.
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Old 08-16-2018, 05:49 PM   #3
Fredb
 
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Default Re: Wallowing...

Tire pressures at good both front and rear... that’s not the issue.
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Old 08-16-2018, 08:04 PM   #4
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Default Re: Wallowing...

New tires need to "Cook" as part of their break in.
Solvents in the rubber are driven out by the heat of normal operation.
Maybe 200 miles of normal driving should get you past that point.
How far have you driven on the new tires?
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Old 08-16-2018, 11:08 PM   #5
Fredb
 
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Default Re: Wallowing...

Thanks 4wheeldog, but tires have well over 800 miles on them at this point.

Quote:
Originally Posted by 4wheeldog View Post
New tires need to "Cook" as part of their break in.
Solvents in the rubber are driven out by the heat of normal operation.
Maybe 200 miles of normal driving should get you past that point.
How far have you driven on the new tires?
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Old 08-17-2018, 12:16 AM   #6
OldWest
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Default Re: Wallowing...

Not sure what wallowing and unstable mean? Lots of steering correction?

As it looks like everything is the same as before except new rear tires:

1. New Tires

Rare, but sometimes tires are out of round. This can lead to vibrations and maybe handling issues?

Added Note: There are apparently several different submodels of the Michelin LTX tires. May want to double check same model tires, same size, same load rating E, etc. Sometimes, manufacturers may change tires but retain same brand name.

2. Out of Balance

New tires not balanced properly? Latest balancing method is called road force balancing--latest and greatest?

3. Wheels NOT Mounted Properly

In another subforum, Class C Sprinter had wheels mounted improperly which caused problems. We have bolts versus nuts. Search for AgileOffroad and wheels in the RVs forums for thread.

4. Alignment

Check 4 wheel alignment. Not all aliignment places can do this.

5. Rear Springs U-Bolts Tappers Club

Dennis at LindenEngineering has posted re loose U-Bolts causing problems. U-Bolts hold rear springs and rear axle together. Tap the U-Bolts with a metal hammer to hear a ring or ping. If hear a clunk, then U-Bolts not properly torqued. Search for threads re this issue.


Why not go back to tire place and have them work on this issue unless too far away. Some tire places will even replace tires within certain mileage if unhappy.

Please post whatever you find out.

Last edited by OldWest; 08-17-2018 at 03:53 PM. Reason: Added Note.
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Old 08-17-2018, 12:25 AM   #7
OldWest
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Default Re: Wallowing...

Road Force.Balancing:

https://www.souzastireservice.com/ti...d-wobbles.aspx

Wheel Mounting:

https://sprinter-source.com/forum/sh...5&postcount=10

https://sprinter-source.com/forum/sh...ghlight=Wheels

U-Bolts:

https://sprinter-source.com/forum/sh...hlight=Tappers

https://sprinter-source.com/forum/sh...hlight=Tappers
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Old 08-17-2018, 12:41 AM   #8
OldWest
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Default Re: Wallowing...

Rear Tires Replaced.on NCV3 and Issues (no conclusion)

https://sprinter-source.com/forum/sh...heel+alignment

Alignment Issues (including Front Cross Member Misalignment)

https://sprinter-source.com/forum/sh...heel+alignment

https://sprinter-source.com/forum/sh...l%22+alignment
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Old 08-17-2018, 04:09 PM   #9
MrTomacco
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Default Re: Wallowing...

Sounds like rear anti sway bar. Bushings all intact? Hidden fracture? Try parking 1 wheel on 4 or 5 inches of leveling blocks and see if any break shows up.

Since it was tires, swap front and rears and see what happens. Keep us informed.
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Old 08-17-2018, 04:24 PM   #10
calbiker
 
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Default Re: Wallowing...

If you're wallowing then the vehicle is rocking side to side. That usually means the shock absorbers don't have enough damping. What shocks do you have? I would suggest Fox from Agile Offroad.
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