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Old 10-06-2018, 05:31 PM   #1
esmth
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Default Bad trailing-arm front bushing?

Hello!

When I accelerate or decelerate, I hear and feel a clunk in the rear suspension that I cannot narrow down. It also constantly clunks when cruising at a very low engine load and RPM. It feels almost like the diff has way too much backlash, and the pinion is slamming forward and back. (though twisting the driveshaft by hand results in a normal backlash and spider gear play.) This has been happening the past probably 3-4 months but recently its gotten worse

I am running ben's spherical main trailing arm to axle bushing, and his full heim torque and panhard rods. (installed in March-ish) The last original bushing in the rear is the front trailing arm bushing. I can wedge a screwdriver between the trailing arm and body and move the arm pretty easily making me think this bushing is bad.

posts like this also make me think its this bushing
http://www.turbobricks.com/forums/sh...94&postcount=8
http://www.turbobricks.com/forums/sh...8&postcount=10

Am I headed in the right direction? Should I replace this bushing with poly?
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Old 10-06-2018, 06:35 PM   #2
dl242gt
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From reading your post you are headed in the right direction. Get that bad old bushing out of there. I have used poly in that location without issue. This is also a pretty hard rubber bushing in that location so even putting in a good quality rubber one should fix the problem.
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Old 10-06-2018, 08:33 PM   #3
permavirgin777
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I concur. I thought I had pictures of mine when I replaced them but I do not; They were pretty bad... and if not original, had not been changed in a good, long while.

I replaced mine with the rubber type. I don't see any large issues with using poly bushes in that location, but others might as there is a piece of bracketry that will need removed somehow. See http://forums.turbobricks.com/showth...24#post5146724

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Old 10-06-2018, 09:56 PM   #4
Otto Mattik
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The only real negative observation about poly I've heard, was from a mechanic who said he's seen poly shatter in extreme winter temps (I'm guessing -10f, -20f, -30f, colder ??). However I didn't hear enough of the details to know if newer or older poly, how old, miles, brand/product, etc..

* Maybe a good question to pose to John V or some snow/ice racers if concerned ?
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Old 10-06-2018, 11:16 PM   #5
esmth
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Quote:
Originally Posted by dl242gt View Post
I have used poly in that location without issue. This is also a pretty hard rubber bushing in that location so even putting in a good quality rubber one should fix the problem.
I may be mistaken but I think because the axle can articulate more with the spherical joints, it is pushing more wear on this bushing and is why I was thinking of replacing it with poly.

Quote:
Originally Posted by permavirgin777 View Post
I replaced mine with the rubber type. I don't see any large issues with using poly bushes in that location, but others might as there is a piece of bracketry that will need removed somehow.
I took a look at that bracket on my car, and I honestly have no idea why that user removed the reinforcement. it's on the outside where the bolt head sits and I don't see how it'll interfere with poly bushings. I'd rather trim the bushings than the mount anyway.

Quote:
Originally Posted by Otto Mattik View Post
The only real negative observation about poly I've heard, was from a mechanic who said he's seen poly shatter in extreme winter temps (I'm guessing -10f, -20f, -30f, colder ??).
It does occasionally hit -10f here in the winter, and I have other poly bushings in the front end and they survive the winter just fine, so i'm not too worried. Plus I love to snow-drift in parking lots so they see 'extreme temperature' with abuse
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Old 10-08-2018, 03:43 AM   #6
JW240
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I replaced those, using rubber bushings. Poly needs lube once in a while and with the damp conditions here I had a few poly bushings go bad when the pivot rusted.
Also using spherical bearings in the tab-axle bushings and torque rods with spherical/poly.
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Old 10-08-2018, 04:12 PM   #7
esmth
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Quote:
Originally Posted by JW240 View Post
I replaced those, using rubber bushings. Poly needs lube once in a while and with the damp conditions here I had a few poly bushings go bad when the pivot rusted.
Also using spherical bearings in the tab-axle bushings and torque rods with spherical/poly.
Poly in this location would be easier to replace then pressing out the rubber bushing and sleeve, yes?

Can i just burn the worn bushing out, leaving the sleeve for the poly ones, Or does the whole sleeve need to come out? I bought this: https://www.ipdusa.com/products/6876...shing-kit-poly
The instruction PDF seems to push the whole sleeve out.

i realized i just answered my own question, lol

Last edited by esmth; 10-08-2018 at 04:14 PM.. Reason: answered my own question
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