Thanks for the offer T.... I already have the Blackray up off of the ground in the garage.... (it stays that way most of the winter).

This should be a quick easy fix for me... (I think).

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These bushings don't make noises if you hit a bump(or an armered-dilly) or a dip. The diff nose bushings will usually only "clunk" under acceleration/deceleration, as the nose of the diff moves up/down under load. Mickers would make noise just taking off fwd or backward. The nose of the diff is moving up/down, and the slop in the worn out bushings is creating the cluck as the nose bottoms on the chassis mount for the bushings.
If yer getting a noiez when dipping, or bumping, it's in the suspension, or exhaust, but not likely the diff nose bushings.

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Joel Adams
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

darnit.... I was afraid of that! I know it isn't the exhaust. I replace all of it and it is definately not the culprit.

I suspect that it is the passenger rear body mount. I read a post by Mike Bogedain about replacing these in Bob Hsmiltons car. He indicated that prior to this it was making a very similar noise.

I have been putting this off because I know the bolts are NOT going to play nice and come out without being torn up or most likely cut out.

Oh well thanks for the info.... rats

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My Ole' Targa Blue 72 makes that "clunk" upon acceleration/decelereation and also when placing the shifter in "D" and "R".  

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Hey..."No Huggy, no ansy..."

What do I need?
There is an "upper' and a "lower" bushing...replace both.

Where do I pick up the bushings?
Any of the Corvette parts vendors will have the bushing kit.

How much are the little rascals?
Normally around $30 or so for both.

What do I need to do?
Remove the old ones, install the new ones.

Is there anything else I need to look at / replace while I am here?
Not particularly. Just a general once-over in the area...u-joints/leaks/loose stuff, etc.

How freakin long will this take?
Depends on how freakin slow you are...
You should be able to replace the bushings in a couple of hours...longer if you take potty breaks.

The procedure to replace these bushings is in the service manuals, but basically, on the '68-'80 cars with the iron diff, there is a removable bracket bolted thru the lower nose of the diff. Remove the bolts on that(be sure to note which way they face...it is important that they go back in the same direction). There is a bolt that holds the lower cushion to the bracket. This bolts goes all the way thru to the upper cushion, which happily is situated pretty much directly under the yoke of the diff., which makes it such a pleasure to remove.
Anyway....
With the nut removed from the bolt, and the bracket removed from the diff, you'll need to raise the nose of the diff up with a jack(or similar appliance), and remove the bolt, and the upper cushion. It may be necessary to dis-connect the rear u-joint(driveshaft) from the yoke to get the bolt out. Every car is different. Some will raise the diff nose enough to remove the bolt without taking the driveshaft loose...some won't.
Replace in reverse order.

The '80> cars with the aluminuminum diffs are a little different to change the cushions on, since they do not have the removable bracket on the diff nose. The "bracket" is actually part of the diff housing. You can only raise the nose of the diff so far on those in order to get the bolt out of the cushion(s).


That's it in a nut-shell....see Terry's link above for a visual image of the set-up.
hth

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Joel Adams
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Hey, Joel.......Thanks for the quick response and "easy to understand" info.  Looks like I've got a project!

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here is a side view on a dissambled car..  very very simple task.

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http://www.vetteprojects.com/bmv

I think I will go ahead and replace the bushing now anyway. Its a pretty simple task and it sure won't hurt a thing.

Thanks for all of the tips, pics, and links...... !

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If you have access to a lift, it only takes about 10 minutes!

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MICK - C3VR Lifetime Member #113

[QUOTE=greypoupon69] If you have access to a lift, it only takes about 10 minutes![/QUOTE]

Otay...I'll put my '74 on da lift, and let's see YOU do the cushions in 10 minutes....how's that?

Soitainly a lift helps, as does having the experience of doing hundreds of these things over the years. For someone that's doing it on their backs, for the first time, it's gonna take just a wee bit longer than 10 min...

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Joel Adams
C3VR Lifetime Member #56    
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

It takes me 10 minutes jest to lift the car

Tuxxy, if the noise is coming from the back, check her shocks, shock mounting pernts, spring bolts, strut rod bushings and TA bushings (hopefully no those!!). Is the spare tahr carrier snugged up good?

Can't think of anything else out back that'll make noise on bumps.

Good ruck!!

Paul