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Old 01-10-2017, 10:37 PM   #1
Chaz9496
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2001 L-Series 2.2L Sedan
2003 L-Series 2.2L Sedan
Default Rear Trailing Arm

Should there be any side to side movement from a pri-bar with these ? I can see some up and down due to the fact they should move up and down as the rear wheel goes over bumps but I'm getting rear "Shimmy" over small bumps and worse on icy streets for some reason like if the rear had worn tie rod ends (example). I suspected the lower rear bushings but they don't seem to have any movement. The rubber is cracked and peels off tho. I have new ones but I'm just wondering if the trailing arm at the body bushings need replaced having some movement other than up and down. The rear upper control arm to hub bushings were replaced last year.

Last edited by Chaz9496; 01-10-2017 at 10:40 PM.. Reason: Removed Comment

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Old 01-11-2017, 12:05 AM   #2
02 LW300
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Default Re: Rear Trailing Arm

I have had two of my L series cars aligned. They installed "smart shims" in the rear. They drive much better on icy roads after. I have not had to replace any bushings only tie rod ends.

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Old 01-11-2017, 12:37 AM   #3
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Default Re: Rear Trailing Arm

Quote:
Originally Posted by Chaz9496 View Post
Should there be any side to side movement from a pri-bar with these ? I can see some up and down due to the fact they should move up and down as the rear wheel goes over bumps but I'm getting rear "Shimmy" over small bumps and worse on icy streets for some reason like if the rear had worn tie rod ends (example).
You're the first member that I know of in the L Series Forums to complain of this kind of unusual movement at the rear axle. The trailing arm should exhibit no lateral travel of any kind. As you correctly noted it must move up and down. That is part of its job as an integral component of the rear independent suspension. There are replacement bushings available where the trailing arm mounts to the vehicle.

See item 14 in the link below.

http://www.gmpartscenter.net/auto-pa...uspension-scat

See item 11 in this link.
http://www.wholesalegmpartsonline.co...riveLine=11480

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Last edited by pierrot; 01-11-2017 at 12:45 AM..

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Old 01-15-2017, 07:12 PM   #4
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Default Re: Rear Trailing Arm

Quote:
Originally Posted by 02 LW300 View Post
I have had two of my L series cars aligned. They installed "smart shims" in the rear.
According to what I've read, the L Series wasn't alignable on the rear, only the front was. It was factory set and not able to be aligned after that unless it was modified yourself. I've called a shop and asked and was told the same thing. Shims needed to be installed to correct any camber issues. BTW, what did they charge to do this ? They said that wasn't a part of the alignment process. That's most likely what mine will need done. Thanks for your comments.

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Old 01-15-2017, 07:30 PM   #5
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Default Re: Rear Trailing Arm

I should have said that I also replaced the rear struts so that may have had something to do with the rear issues I'm having with tire ware and wandering (unstable). I have the bushings but have no time to replace them as of yet. I think that before I have any shop do any work to correct toe or camber I should replace them first.

Last edited by Chaz9496; 01-15-2017 at 07:31 PM.. Reason: Added Comment

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Old 01-15-2017, 08:36 PM   #6
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Default Re: Rear Trailing Arm

I took my car to a reputable alignment shop and they read the car and made sure no parts needed to be replaced. The pair of smart shims cost about $20 each and they charged one hour labor each side to install plus the alignment. So about $300 out the door. The shims are adjustable for both toe and camber and fit between the wheel bearing/hub assembly and the knuckle. I can post a picture of the shim if you are interested.

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2002 L200/a
133k miles, new chains, guides and valves
Built for a grandson.
2002 l200/5 loaded
Under construction, my next driver
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Old 01-16-2017, 11:24 AM   #7
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Default Re: Rear Trailing Arm

Aftermarket rear control arms are also available so that adjustments can be made.

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Old 01-16-2017, 11:45 AM   #8
02 LW300
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Default Re: Rear Trailing Arm

The aftermarket control arms are expensive and only correct one spec. The smart shims adjust both and are inexpensive.

...
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Willamette Valley, Oregon
2002 L200/a
133k miles, new chains, guides and valves
Built for a grandson.
2002 l200/5 loaded
Under construction, my next driver
Lots of l200 parts

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Old 01-16-2017, 03:11 PM   #9
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Default Re: Rear Trailing Arm

02 LW300. Please post a picture. I'd sure be interested in how it looks/works. Do you know who makes it? Moog? Maybe.

Thanks

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Old 01-16-2017, 04:06 PM   #10
Chaz9496
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Default Re: Rear Trailing Arm

I wonder if when I converted the rear brakes from drum to disc this may have dicked with the camber. It hadn't worn off the rear tires for very long, just probably since about that time. I must have done something to cause it including what I'd stated about changing out the struts as well about that time. I may have to take it to my shop that does my work when I can't or don't have time to DIM and have it checked out there. I have new tires sitting in the garage but don't want to run them until the problem's solved.

Last edited by Chaz9496; 01-16-2017 at 04:13 PM.. Reason: Added Comment

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Old 01-16-2017, 06:30 PM   #11
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Default Re: Rear Trailing Arm

Quote:
Originally Posted by 02 LW300 View Post
The aftermarket control arms are expensive and only correct one spec. The smart shims adjust both and are inexpensive.
Moog adjustable rear control arms are about 60 bucks each so that is hardly expensive. Also the toe is adjustable already from the factory, the mounting plate that locates the front of the trailing arm is where you adjust the toe. For under 200 you can have an alignment and +or- 4 degrees of camber, way better than shims.

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Old 01-16-2017, 09:24 PM   #12
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Default Re: Rear Trailing Arm

[URL=http://s863.photobucket.com/user/me-and-my-metro/media/IMG_0510.jpg.html][/

...
Mechanic
Willamette Valley, Oregon
2002 L200/a
133k miles, new chains, guides and valves
Built for a grandson.
2002 l200/5 loaded
Under construction, my next driver
Lots of l200 parts

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Old 01-17-2017, 06:58 AM   #13
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Default Re: Rear Trailing Arm

02 LW300, Thank You for posting the pictures. This is great information for all of us.

Soulsurvives, I was not aware that the rear toe was adjustable on our cars. Thanks for passing that on as well.

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Old 01-18-2017, 12:02 AM   #14
Chaz9496
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Default Re: Rear Trailing Arm

I need another part reference here. What bushing is the "Trailing Arm" to body bushing listed as ? Rock Auto shows only lower and upper control arm bushings. These aren't control arms, totally different from a trailing arm. I don't see RA showing a "Trailing Arm" bushing, at least under that part name. Possibly "Rearward" bushing ? Appears I'm going to have to replace those as well, plus install the "Quick Shims" and then taken in for alignment before mounting the new rear tires. The shims are $3 each.

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Old 01-18-2017, 01:37 AM   #15
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Default Re: Rear Trailing Arm

The bushing is apparently still available from the OE source. As you saw, RockAuto.com has no listing for this particular part.

Here I chose your '01 L200. This webpage has it as item #13, but while the description is partially incorrect the part number is correct.
http://www.gmpartscenter.net/auto-pa...uspension-scat

Here I chose your '03 L200. This webpage has a more accurate part description. See item #11.
http://www.wholesalegmpartsonline.co...riveLine=11480
Of course, the bushing part number is the same from either supplier. I just wanted you to see two different website's diagrams with the change in model year.


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Old 01-18-2017, 04:47 AM   #16
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Default Re: Rear Trailing Arm

Quote:
Originally Posted by Chaz9496 View Post
I need another part reference here. What bushing is the "Trailing Arm" to body bushing listed as ? Rock Auto shows only lower and upper control arm bushings. These aren't control arms, totally different from a trailing arm. I don't see RA showing a "Trailing Arm" bushing, at least under that part name. Possibly "Rearward" bushing ? Appears I'm going to have to replace those as well, plus install the "Quick Shims" and then taken in for alignment before mounting the new rear tires. The shims are $3 each.
They are the same as the Saab 9-5 and can be found on eBay. I got mine off a gm parts site.

Last edited by soulsurvives; 01-18-2017 at 04:57 AM..

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Old 01-18-2017, 10:57 AM   #17
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Default Re: Rear Trailing Arm

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Originally Posted by soulsurvives View Post
They are the same as the Saab 9-5 and can be found on eBay. I got mine off a gm parts site.
Oh yeah, that's true. Thanks.

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Old 01-18-2017, 11:14 AM   #18
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Default Re: Rear Trailing Arm

Quote:
Originally Posted by Chaz9496 View Post
Oh yeah, that's true. Thanks.
I just bought 2 for $47 on eBay with free shipping. I didn't look very well the first time. Thanks for the tip again.

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Old 01-18-2017, 11:20 AM   #19
02 LW300
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Default Re: Rear Trailing Arm

The quick shims are the last step. They are the alignment adjustment. They are two part shims that clock in one position after reading on the alignment rack.

...
Mechanic
Willamette Valley, Oregon
2002 L200/a
133k miles, new chains, guides and valves
Built for a grandson.
2002 l200/5 loaded
Under construction, my next driver
Lots of l200 parts

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Old 01-19-2017, 06:44 PM   #20
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Default Re: Rear Trailing Arm

Did anyone think of a broken coil spring as the wandering problem ? That's what I found after going to replace the lower control arm/trailing arm bushings. The bushings were tight but the rubber bad. When I get the rearward TA bushings tomorrow I'll change it all out next week then to the alignment shop, so to speak. Just thought I'd run it by you what I found. Should drive good now.

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