Front shock upper bolt
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,108
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
I've never been there on the front, nor have I ever torqued the rear ones any of the several times they've been out. If/when the shocks ever fail, I plan to pretty much replace the whole suspension and I'll deal with it then. I'm only at 132K now, so it could be a while. 
If you accomplish this, I'd appreciate a short how-to write up.
If you accomplish this, I'd appreciate a short how-to write up.
Drifting
Joined: Nov 2011
Posts: 1,843
Likes: 330
From: western NY
I changed the front mag shocks on my ZR1 a couple of months ago (leaking -warranty job). Easy to get to from the engine compt. All I did was lift up the rubber flap on the pass. side & I think I swung the coolant reservoir out of the way on the left side.
Race Director
Joined: Aug 2005
Posts: 13,592
Likes: 187
From: Hudson WI
NCM Sinkhole Donor
Next to impossible to put a torque wrench on it. I just tightened them down and move on. I have changed shock 4 times in 10 years. Z06, Bilstiens, Pfadt Coilovers, LG coilover, with no issues.
Thread Starter
Racer
Joined: Jan 2007
Posts: 462
Likes: 3
From: Plainview New York
a
I'll check from under hood tomorrow. I've been getting a clunk sound from the left front wheel on occasion, only on a downward suspension movement. I've checked end links, lower shock bolts, all suspension parts in that area. As mentioned it is only on occasion from the left front on a downward movement not necessarily a pot hole which I always avoid. There is no vibration in steering wheel at all, and the alignment is right on.
Thanks for the suggestion for getting to the upper bolt.
Thanks for the suggestion for getting to the upper bolt.
Thread Starter
Racer
Joined: Jan 2007
Posts: 462
Likes: 3
From: Plainview New York
On checking this morning it seems to be the coolant reservoir that would have to be moved over to get to that upper bolt on shock. On visual inspection all seems tight I am going to check those end links again and go up a little on the torque. Would 60 be a safe number to up on torque of end links?
Drifting
Joined: Nov 2011
Posts: 1,843
Likes: 330
From: western NY
It looks like the torque spec is 44 lb-ft + 30 degrees for a '13 Z06.
Found another chart in the GM eSI software that also lists 56 lb-ft as a spec.
Last edited by jft69z; Jul 6, 2016 at 01:07 PM.
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Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,108
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
On checking this morning it seems to be the coolant reservoir that would have to be moved over to get to that upper bolt on shock. On visual inspection all seems tight I am going to check those end links again and go up a little on the torque. Would 60 be a safe number to up on torque of end links?
The spec is not a torque and turn to yield spec, so unless you have already passed the yield point previously, a 60# torque setting on a reused end link nut or bolt is perfectly fine.
However, 2k Cobra is correct that end links wear out and then make noise. The ball and socket design with the socket material being less dense than the ball eventually elongates. I consider end links to be consumable wear items that need to be replaced occasionally. The noise is the indicator they are toast.