Subframe Bolts

[JJ91284]

What are you guys tightening the subframe bolts to? I tightened mine to 133 lb ft and my subframe still makes a clunking sound under extreme braking/Fast acceleration/cornering since I dropped my cradle to rebuild my trans.

Anyone have an ideas?

[FoSHO99]

Are you sure its your subframe?

Maybe your swaybar endlinks broke after reinstalling.

[TurboKent]

I've heard the bolts are torque to yield. meaning they are only good for one use and once you remove them you have to get new ones.

[Street Wolf]

I've heard the bolts are torque to yield. meaning they are only good for one use and once you remove them you have to get new ones.

Not true.



And x2 on making sure it's your actual subframe making that noise.

[JJ91284]

I purchased new sub frame bolts because my Helms manual said to. My entire front suspension is relatively new (GMPP Handling kit, GMPP Springs, AGX struts, New Strut Moutns, Springs, Ball Joints, tie-rods, ect). I'm almost positive its the sub frame bolts as that is what would cause a popping sound when braking really hard or accelerating quickly.


I think I'm going to put my transverse engine support on again and try relieving some weight and I'll try retorqueing the bolts. I never removed the sway bar to drop my cradle as you don't have too.


My subframe prior to tranny install

[UR LOSN]

I did mine to 180ftlbs....with locktite.

havent heard anything, and havent had the car out...lol

[Blown97]

I have this same issue except I don't have to take off like crazy or brake like crazy to get it to do it. I did tighten the sub frame bolts and noticed that most of it disappeared (not all of it) but I figured that if they were lose and the sub frame was sliding (clunking) back and fourth it probably galled the threads on the bolts. Therefore, because the threads were possibly messed up my torque readings might be off and the bolts might not be tightened enough or correctly.