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  #1  
Old 10-11-2012, 08:48 PM
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Default Weird issue....anyone ever had this happen?

Doesn't matter whether it's low speeds or high speeds when I let off the gas the rear of the truck noticeably moves to the left.
I've checked and double checked the rear suspension bolts. All the link bars are tight. I pulled the adjustable panhard to make sure it wasn't broken. I can't find a single thing wrong back there. It's a 3/5 drop so I thought maybe I was feeling the truck unload and the bar was pulling it to one side but after watching 10 times or so with the mirror pointed at the rear tire I can't see any lateral movement of the axle when it happens.

It feels like it would if the right front brake caliper was hanging but there's no discoloration on the rotor to indicate it's hanging and getting hot. I'm putting new front brakes on tomorrow anyway so that'll eliminate that as a possible cause. If it stops I'll know that was it.

Other than that I'm at a loss....this is the first time I've ever experienced this on any vehicle so I thought I'd put it out there to see if it had happened to anyone else.
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Old 10-11-2012, 09:24 PM
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If i had to guess i sounds like a thrust alignment problem but it would odd. I would be looking at all the same things you did. Please let us know
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Old 10-11-2012, 09:37 PM
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I measured the rear axle...from the points I used it's true to the frame.
This is a new issue too...I just noticed it for the first time when I drove it earlier this week. It's noticeable enough that when I felt it I pulled over to check...I thought the panhard bar broke.
There's only 2200 miles on the truck...everything is literally brand new. I'll put it on the lift at work tomorrow and double check my measurements in the back. Thrust is a possibility...damned if I can figure out how though.
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Old 10-12-2012, 08:32 AM
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With a 3/5 drop your axle is probably off center roughly 1/2" to 1". I can't remember the geometry of the panhard off the top of my head so don't know which side it will be offset to, but with anything more than a 2" drop in the rear you really should use an adjustable panhard bar to get the axle centered up. I dropped the rear of my truck roughly 1"(slightly less actually) and there's a noticeable offset to the axle. I can't imagine what it'd be like with a 5" drop. I would think this is the issue. With the panhard pushing the axle off center at "resting" height you'd be putting a lot of lateral stress on the 4 links.
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Old 10-12-2012, 11:50 AM
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Quote:
Originally Posted by snrusnak View Post
With a 3/5 drop your axle is probably off center roughly 1/2" to 1". I can't remember the geometry of the panhard off the top of my head so don't know which side it will be offset to, but with anything more than a 2" drop in the rear you really should use an adjustable panhard bar to get the axle centered up. I dropped the rear of my truck roughly 1"(slightly less actually) and there's a noticeable offset to the axle. I can't imagine what it'd be like with a 5" drop. I would think this is the issue. With the panhard pushing the axle off center at "resting" height you'd be putting a lot of lateral stress on the 4 links.

He says in his first post he has an adjustable panhard, probably from Spohn. I would look into brakes a little closer, see if something weird is going on, especially knowing you have checked everything else and it is a new issue.
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Old 10-12-2012, 12:53 PM
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Quote:
He says in his first post he has an adjustable panhard, probably from Spohn. I would look into brakes a little closer, see if something weird is going on, especially knowing you have checked everything else and it is a new issue.
OH! my bad.........
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Old 10-12-2012, 05:04 PM
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Guess your gonna have to change your username? J/K, I would also think brakes. Would'nt hurt to to have alignment checked...
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Old 10-12-2012, 08:04 PM
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Found it....upper bushing in upper Spohn link bar blown out from contact with the frame.
Swapped in oem link bars today and taller bump stops....problem solved.
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Old 10-13-2012, 02:04 PM
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that would do it, we were one the right path with thrust line problems
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Old 10-13-2012, 08:50 PM
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Yep...I sure didn't expect that though.
Couldn't see it till I pulled the link bars out then it was clear as day.
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