Changed out the right side LCA today. It was factory from 2008!! Yup the bushing was shot. I drilled, ground and pressed the old rivets out and replaced with a TRW balljoint with grade 10.9 12MM bolts, washers and nylocks. Pressed out the old rear bushing with a piece of 3" long pipe turned down to just a hair small ID than the bushing, so I can press it out without getting my tool stuck. Prepping the LCA is a major pain! Now here is where I want your feedback. When I go to torque the rear bushing bolt, I go 74 ft lbs then it calls for another 180 degrees!! I get about 90 degrees and stop, I swear if I go the full 180 that it is literally gonna snap the bolt or booger up that nut that is encapsulated in where ever it lives. Eiither of which is gonna make this job light years worse. Do you guys do the full 180, has any one had issues?

 

I use a new bolt and do the full 180 degrees, a used bolt, you can reuse but just tighten it until you are comfortable, 90 to 120 degrees should be fine.

 

make sure you have the bolts in thier correct position. Fronts and rears are different lengths

 

You can’t really mix up the front bolts as they are much smaller and shorter than the 14mm rear bolt.

 

Always replace torque-to-yield bolts! They can be stretched once, but not twice. The part number is 11589009, but you need to verify this first. It will cost $15-$20 each.

 

11589009 Is that rear bushing bolt for the LCA’s. RA is out of stock, GM dealers list it, Amazon lists it.

 

Yes, that is a torque-to-yield bolt. Any bolt that has to be torqued to a point, then more degrees are added to the tightening is this kind of bolt. For safety reasons, they can only be used once, using them twice can lead to breakage.

 

Not exactly; TTY bolts stretch so that the threads are deformed to a point they lock in, and can not be reused because they are deformed. Torque to Angle is just a more accurate way of measuring consistent clamping force.
TTY is not exactly the same as TTA. TTY is a type of bolt, TTA is a procedure.

TTY vs. Torque-to-Angle (TTA)

• TTY (Torque-to-Yield): Stretches past the yield point; not reusable.
• TTA (Torque-to-Angle): Stretches within the elastic range; can return to original length and is potentially reusable.

You can tell a TTY bolt by the shank is narrower than the threaded portion.

https://www.freeasestudyguides.com/a1_4.html
https://www.felpro.com/technical/tec...tty-bolts.html
https://www.onallcylinders.com/2016/...gle-fastening/

 

In any case use it once , order new next bushing failure.