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Old 06-10-2019, 09:05 PM   #67
Indyblue98
2012 RS 2ss
 
Drives: 2018 ZL1 2012 2SS WhippleCharged
Join Date: Feb 2012
Location: Kansas
Posts: 414
Quote:
Originally Posted by BMR Tech View Post
The cradle bolts and all of the trailing and control arm bolts are torque to yield or a 1 time use fasteners per GM. We designed and released all of these parts before the service manual was available to the public, and we never went back and checked any of this info until now. We have sold hundreds of these kits as well as sets of arms and this is the first instance of a failure that we know of. Our own 2016 Camaro that we designed and tested all of these parts on has been taken apart and put back together multiple times and still uses the original bolts. We are changing our instructions to read that GM recommends that the bolts not be reused and will be including the GM part numbers(Listed below). We apologize for this inconvenience. Please contact me directly at frank@bmrsuspension.com or 813-986-9302 if you have any further questions

GM Part # 11547921 Front Cradle Bolt quantity of 2 required
Torque Spec
First Pass: 100Nm(74 lbft)
Final Pass: Plus 90-105 Degrees

GM Part # 11611819 Rear Cradle Bolt quantity of 2 required
Torque Spec
First Pass: 100Nm(74 lbft)
Final Pass: Plus 90-105 Degrees

GM Part # 11610908 Upper & Lower Trailing Arm Bolt quantity of 4 required
Torque Spec
First Pass: 100Nm(74 lbft)
Final Pass: 105 Degrees

GM Part # 11610908 Outer Upper Control Arm Bolt quantity of 2 required
Torque Spec
First Pass: 70Nm(52 lbft)
Final Pass: 105 Degrees

GM Part # 11610909 Inner Upper Control Arm Bolt quantity of 2 required
Torque Spec
First Pass: 70Nm(52 lbft)
Final Pass: 105 Degrees

GM Part # 11516078 Nut for all the above control arm and trailing arm bolts quantity of 12 required

GM Part # 11609598 Outer Toe Rod Bolt quantity of 2 required
Torque Spec
First Pass: 100Nm(74 lbft)
Final Pass: 105 Degrees


I purchased and installed the Cradle lockout kit for Christmas , and still have the Trailing arms waiting for installation .

Thanks for the Part #'s on the Bolts .

The instructions quoted appear to be one time use bolts

My question is : Are the #'s Torque to Yield ?

If yes , can you PLEASE provide the Part #'s and install instructions for the older style PRE-2017 bolts that are reusable .

Can't imagine a good reason to install one time use bolts since the car is going in for alignment and more bolts would then be needed.
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2018 ZL1 A10 and 2012 2SS RS Whipple-Corsa-RotoFab-ZL1 Diff 3.73 Pfadt ZL Stage 3 Suspension+
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