How to tell if rear LCA bushings are bad - LS1TECH

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How to tell if rear LCA bushings are bad

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Old 04-22-2012, 12:05 PM   #1
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Default How to tell if rear LCA bushings are bad

I've been searching for about 45 mins and can't find the answer. Stock LCA's, replaced bushings with Moog about 4 years ago.

When tightened to 90lbs, on the rearend, other end not attached, should there be any side to side wiggle? How do you tell if the bushings have gone bad?
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Old 04-22-2012, 06:02 PM   #2
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since no replied i'll try to help. I've never had stock lca's on my car, but you prolly will have some side to side play with the stock bushings as they are soft rubber for good noise dampening. If your concerned about it, why not just buy a set of lca's from one of our vendors. Around 100 bucks i believe and will improve the car.
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Old 04-22-2012, 06:09 PM   #3
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Thanx

I'm positive it will improve the car; short on funds at the moment. She needs a number of things, I'm just trying to limp along. I appreciate the input.
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Old 04-22-2012, 06:56 PM   #4
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4 year old moogs should be fine. side to side wiggle is normal because they are rubber, and you need some side to side movement for normal suspension articulation anyway. Poly bushings don't have much (if any) side to side movement, so they suck for street applications because they bind.
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Old 04-22-2012, 08:23 PM   #5
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Cool, I'm chasing a bind, so I'm looking at everything extra careful. I think I found part of my problem in the torque arm. The holes are ovalled a bit and, the hard part, I have an option of taking the angle that the top prefers against the rearend or the angle that the bottom prefers because it's "spread open" a bit. Unfortunately, there's a noticeable difference between the two and I don't know which (if either) is right. All I have is a cheap-*** protractor to measure the thrust angle with and that's not going to cut it
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Old 04-23-2012, 10:36 AM   #6
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63 bucks, brother. You go buy bushings alone and you're over half way there. Just a thought.

Founders Performance.

http://www.foundersperformance.com/p...trol-Arms.html
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Old 04-23-2012, 04:30 PM   #7
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Poly bushings? Not a good idea.

Not good for a street car. They don't articulate the way they need to. He'll have more, not less bind with those.
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Old 04-23-2012, 04:38 PM   #8
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Just throwing a cheap alternative out there.
I'd personally get the poly/swivel combo.
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Old 04-23-2012, 07:18 PM   #9
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I wish they offered those with rubber bushings. I'd be all over them just to not deal with pressing out the old bushings out of the stock arms.
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Old 04-23-2012, 10:06 PM   #10
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Quote:
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Poly bushings? Not a good idea.

Not good for a street car. They don't articulate the way they need to. He'll have more, not less bind with those.
Are you speaking from experience? Because I put on the same LCAs pictured from founders and my car felt/rode/handled better. I was pleasantly surprised because of all the jargon I hear on here about poly bushings.
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Old 04-23-2012, 10:07 PM   #11
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My stock bushings were noisy as hell. Any little bump in the road and you would hear clunking and rubber squeaking. Replaced them with Moogs and they're dead silent. Didn't need a press BTW, but it would have made removing the old bushings a lot easier.

Skip the poly and rod ends, **** all that for a street car. Shame on all these companies for pushing a product that's inferior to stock and saying it's the greatest thing you can buy. A bunch of snake oil salesmen.
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Old 04-23-2012, 10:19 PM   #12
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Quote:
Originally Posted by FirebirdTransAm View Post
Are you speaking from experience? Because I put on the same LCAs pictured from founders and my car felt/rode/handled better. I was pleasantly surprised because of all the jargon I hear on here about poly bushings.
No I haven't had any poly bushings, just rubber. But I've looked at the way the rear axle moves, looked at the single axis that poly gives, and concluded that it probably wouldn't be too great. Others here then have done actual tests and my analysis on paper was correct.

I'm not saying I'm a suspension expert, certainly not. But when you need a secondary axis and poly doesn't give that it isn't hard to see why poly would be a problem.

I don't know what your car is like, nor the condition of your suspension before you got the poly ended LCAs, but one possibility that comes to mind is that your stock rubber bushings were really bad so they weren't doing their job. At that point any bushing - more bind or not - would be an improvement. I was there with my old 98, the factory rubbers literally fell out when I took off the LCAs.
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Old 04-23-2012, 10:33 PM   #13
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Quote:
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No I haven't had any poly bushings, just rubber. But I've looked at the way the rear axle moves, looked at the single axis that poly gives, and concluded that it probably wouldn't be too great. Others here then have done actual tests and my analysis on paper was correct.

I'm not saying I'm a suspension expert, certainly not. But when you need a secondary axis and poly doesn't give that it isn't hard to see why poly would be a problem.

I don't know what your car is like, nor the condition of your suspension before you got the poly ended LCAs, but one possibility that comes to mind is that your stock rubber bushings were really bad so they weren't doing their job. At that point any bushing - more bind or not - would be an improvement. I was there with my old 98, the factory rubbers literally fell out when I took off the LCAs.
I had replaced the factory bushing within the last 30k but I decided I'd rather have the stiffer suspension (possible bind) because I don't auto x or road race my car, only drag race when I do get the chance. Like I said, I had heard the same things over and over on here so I was pleasantly surprised when I replaced the stock lcas with the founders and it felt less harsh and definitely a lot tighter when turning. The stock stamped pieces are relatively chincy, if we are being honest they are kind of embarrassing. I will never go back, Ill stick with the polys that really aren't all that stiff, simulate rubber pretty well in my opinion and they are grease-able which is nice.

Also the stock stamped pieces have to flex a lot under significant load and I don't like the thought of my only link between my axle and body bending and flexing under load just so it won't "bind". Sounds worse imo.
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Old 04-23-2012, 10:36 PM   #14
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More about polyurethane...

http://hewsoninc.ca/mythinformation.htm

If you want a stiff suspension, you don't want it to come from binding bushings. Tuning your suspension should be done with shocks, springs, and sway bars.
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Old 04-23-2012, 10:45 PM   #15
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I think we can all agree that the stock stamped U shaped pieces are pretty craptastic
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Old 04-23-2012, 10:51 PM   #16
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Quote:
Originally Posted by Latch View Post
More about polyurethane...

http://hewsoninc.ca/mythinformation.htm

If you want a stiff suspension, you don't want it to come from binding bushings. Tuning your suspension should be done with shocks, springs, and sway bars.
Like I said, I have read and understand the logic behind poly bushings, trailing arm suspensions, rubber vs poly comparisons, panhard bars, binding senarios etc.

However, my car rides less harsh and handles better with tubular lcas with founders "poly" bushings than it did with stock lcas and 30k moog replacements.

If they didn't I would take them off and caulk up the $55 to bad judgement. However, they feel great and I recommend them.
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Old 04-23-2012, 10:53 PM   #17
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Quote:
Originally Posted by SparkyJJO View Post
I think we can all agree that the stock stamped U shaped pieces are pretty craptastic
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Old 04-23-2012, 10:57 PM   #18
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Seems like it wouldn't be too tough to fab a set of rubber bushings for the above arms, looks like they're a little smaller than stock, so shaving down some moogs... Ah, nevermind, just talking out my ***...
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Old 04-23-2012, 11:20 PM   #19
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What's wrong with them with Moog 1LE bushings?!

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I think we can all agree that the stock stamped U shaped pieces are pretty craptastic
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Old 04-23-2012, 11:37 PM   #20
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I highly doubt that stiffer bushings are going to make the ride less harsh. If that's the case, just go straight to rod ends... that should make it ride like a Cadillac.
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