Author Topic: C2 rattle (clunk) in rear end  (Read 4942 times)

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Offline anychevy

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C2 rattle (clunk) in rear end
« on: April 13, 2012, 12:34:01 PM »
Thought this was just a loose spare carrier (it's not)
Pulled the wheels off, took the weight off the control arms and noticed I could pull the half shaft yokes out of the diff
~1/2" on the LHS and ~1/4" on the RHS ?
I read over on CF this amount of end play is not normal, but also not dangerous (not going to fall out)
Could this rattle (clunking) noise be the yoke slamming back into the diff over bumps ?
Anyone have any experience with this ?

Offline Bfit

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C2 rattle (clunk) in rear end
« Reply #1 on: April 13, 2012, 12:50:20 PM »
I had a noise in the rear  of  a 70 model  recently
and looking into the problem I came up with some specs
that end play the i found  for the yoke  
was listed at no more than 1mm (0.040" )
but I also found 0.3mm (0.012" )

I have one car that has 3/16" and has no noises at all.
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Offline anychevy

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C2 rattle (clunk) in rear end
« Reply #2 on: April 13, 2012, 01:09:15 PM »
With the wheels on the ground and the jack under the leaf, one side at a time.
I can rock the LHS wheel and move the yoke in and out of the diff around 1/2"
The RHS has no noticeable end play when I do the same thing.
So I'm thinking the C clip (or whatever type of retainer is used) is broken or worn out.
Or the trailing arm bushes are gone, or both ?

Offline Bfit

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C2 rattle (clunk) in rear end
« Reply #3 on: April 13, 2012, 01:38:21 PM »
Dave  I have not  pulled the diff apart  in a vette yet
Buy if you take the half shaft out  of the LHS  and the clip is gone or broken
I would think you could pull the yoke out

May be some one who has had a Diff  apart could confirm if that is true

If the diff has to come out I can see that is not a small job
Bfit
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Offline anychevy

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C2 rattle (clunk) in rear end
« Reply #4 on: April 13, 2012, 02:11:54 PM »
Quote from: Bfit link=topic=9139.msg1045942464#msg1045942464

May be some one who has had a Diff  apart could confirm if that is true
If the diff has to come out I can see that is not a small job
Bfit

It looks like you can get to the guts with most of the housing still in.
Still a fairly big job that I don't have the tools for.
I'll have to get it towed, can anyone recommend a place in Sydney ? :shake:

Offline 72vet

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C2 rattle (clunk) in rear end
« Reply #5 on: April 13, 2012, 02:27:28 PM »
Hi Dave, Iíve moved your thread for ya.

Give John a call  9831 6072 - Jmac Diff & Gear - Arndell Park

Nick

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Offline anychevy

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C2 rattle (clunk) in rear end
« Reply #6 on: April 13, 2012, 02:41:14 PM »
Quote from: 72vet link=topic=9139.msg1045942467#msg1045942467
Hi Dave, Iíve moved your thread for ya.

Give John a call  9831 6072 - Jmac Diff & Gear - Arndell Park

Nick


Thanks Nick
I gave him a call and he said that amount of end play is not good, but there could be other issues.
What else under there, makes a dull rattle and sounds like something hitting the body, but only over bumps ?
The car seems to drive fine, no bearing noises, just this annoying rattle :grr:

Offline 72vet

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C2 rattle (clunk) in rear end
« Reply #7 on: April 14, 2012, 09:24:48 AM »
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Offline anychevy

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C2 rattle (clunk) in rear end
« Reply #8 on: April 14, 2012, 10:16:47 AM »
Quote from: 72vet link=topic=9139.msg1045942475#msg1045942475
Have you looked at the front Diff mount?

It's old, but still looks pretty thick and tight.
I broke one on a 68 years ago and it made a hell of a noise as soon as you let the clutch out, almost like the ring gear lost a tooth.

This is more of a dull rattle, only over bumps and sounds like something's loose ?
I think it's possibly the side yoke retaining clip (or clips) I can pull the yoke out of the diff 1/2" :banner:
I believe the little clip at the end of the spline is all that holds them in ?



Offline sirfixalot

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C2 rattle (clunk) in rear end
« Reply #9 on: April 14, 2012, 05:01:54 PM »
Maybee exhaust where it comes under diff my 78 has a sheet metal heatshield there which I have never got round to fitting after replacing diff.
Handbrake cable on exhaust pipe?

Offline Camo

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C2 rattle (clunk) in rear end
« Reply #10 on: April 14, 2012, 07:24:26 PM »
Quote from: anychevy link=topic=9139.msg1045942479#msg1045942479

............I think it's possibly the side yoke retaining clip (or clips) I can pull the yoke out of the diff 1/2" :banner:
I believe the little clip at the end of the spline is all that holds them in ?



I had those clips broken on my 77 and had all that free play you speak of, but had no noise that you speak of.  You will need to get that fixed though.  If it's been rubbing badly inside the diff you will need new yokes.

Have you checked bumper bar brackets etc?

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Offline anychevy

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C2 rattle (clunk) in rear end
« Reply #11 on: April 15, 2012, 09:45:20 AM »
Quote from: Admin link=topic=9139.msg1045942489#msg1045942489
 If it's been rubbing badly inside the diff you will need new yokes.
Have you checked bumper bar brackets etc?

Checked all the usual suspects, bumpers, exhaust (side pipes) spare carrier etc. etc.
All the rear suspension bushes look flogged out, so one or more could be the culprit, but will also pull the diff out and get it looked at,.
The yoke moving around is definately not good.
Anyone know a good source for a rear suspension rebuild kit ?
I might as well do the lot while I have it in bits :rolleyes: