Knock or clunk from rear but not during cold weather - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

PowerCreep · 04-09-2018, 02:22 AM

So I've read through practically every thread on here that mentions a noise from the rear of the car.
Specifically mine "seems" to come from the passenger rear. It sounds like something bouncing against the body of the car. For instance if you tap the back side of your car with your knuckle (like around the gas filler) it is a similar sound to that.

Here's how it happens:
ONLY over bumps. No whine, screech, roar, etc. Just the knock.
It can be one knock or multiple depending on the surface.
It ONLY happens in warmer weather. I noticed it last summer after I bought the car but during the entire winter the noise disappeared. Now that it's warming up, it's back.

What I've done:
Been on a lift. I have pulled and yanked on everything I could lay my hands on.
Removed trunk carpeting and dug around under there on the right side near fuse box.
Made sure battery, spare, etc solidly in place. Nothing rolling around in that area.
Rear fender wells are solidly in place.
Wheel size doesn't matter. Made same noise before new wheels.

So what could be making noise but not during colder (probably less than 45 degrees or so) weather? Ideas?

Thanks.

KillboyPowerhead · 04-09-2018, 05:41 AM

Any suspension work done? All suspension-related nuts and bolts tight?

PowerCreep · 04-10-2018, 03:18 AM

Quote:

Originally Posted by KillboyPowerhead

Any suspension work done? All suspension-related nuts and bolts tight?

No suspension work. Again, pulled and tugged on everything I could. Everything seemed tight. Did NOT put a wrench on everything.
Still confused by the cold weather aspect...

camarosspower · 04-10-2018, 12:30 PM

Ever mess with the differential? Cold weather will thicken the oil thus reduce any noises in the diff. Hot weather thins the oil so you hear more noises. Upgraged diff bushings? Eaton true trac?

600hp-lpe · 04-10-2018, 01:10 PM

sounds like a cv joint on an axle.

Synner · 04-10-2018, 09:21 PM

Pulling on a part while on a lift won't verify anything unless it's completely broken. Tighten the crap outta everything, especially sway bar end links. Use loctite. That solves 90% of issues. There's a lot of slop in a stock drivetrain which also contributes.

04-09-2018, 02:22 AM	#1
PowerCreep Drives: '14 SS 509.5 RWHP Join Date: Jun 2017 Location: Little Rock, AR Posts: 59	Knock or clunk from rear but not during cold weather So I've read through practically every thread on here that mentions a noise from the rear of the car. Specifically mine "seems" to come from the passenger rear. It sounds like something bouncing against the body of the car. For instance if you tap the back side of your car with your knuckle (like around the gas filler) it is a similar sound to that. Here's how it happens: ONLY over bumps. No whine, screech, roar, etc. Just the knock. It can be one knock or multiple depending on the surface. It ONLY happens in warmer weather. I noticed it last summer after I bought the car but during the entire winter the noise disappeared. Now that it's warming up, it's back. What I've done: Been on a lift. I have pulled and yanked on everything I could lay my hands on. Removed trunk carpeting and dug around under there on the right side near fuse box. Made sure battery, spare, etc solidly in place. Nothing rolling around in that area. Rear fender wells are solidly in place. Wheel size doesn't matter. Made same noise before new wheels. So what could be making noise but not during colder (probably less than 45 degrees or so) weather? Ideas? Thanks.

04-09-2018, 05:41 AM	#2
KillboyPowerhead Drives: 2015 Z/22 Join Date: Aug 2015 Location: Ontario, Canada Posts: 931	Any suspension work done? All suspension-related nuts and bolts tight? __________________ Overkill/Self Tuned; Mace Camshafts; K&N Typhoon Cold Air Intake; Ported 80mm Throttle Body/Intake Manifolds/Manifold Spacer; Solo Performance High-Flow Cats, Cat-back Exhaust; Vitesse Motorsports Throttle Controller; Elite Engineering E2 Catch Can; BC Racing BR Coilovers; JPSS Delrin Radius Rod Bushing Inserts, Sway Bars; Pegasus Aluminum Rear Cradle Bushings, Camber/Caster Plates; Z/28 Toe Links, Trailing Arms, Upper Control Arm Bushings, Rear Shock Mounts

04-10-2018, 12:30 PM	#4
camarosspower Drives: 2010 camaro ss Join Date: Jun 2010 Location: Port Arthur, Tx Posts: 2,383	Ever mess with the differential? Cold weather will thicken the oil thus reduce any noises in the diff. Hot weather thins the oil so you hear more noises. Upgraged diff bushings? Eaton true trac?

04-10-2018, 01:10 PM	#5
600hp-lpe Drives: 2010 Join Date: Jul 2009 Location: NH Posts: 4,788	sounds like a cv joint on an axle.

04-10-2018, 09:21 PM	#6
Synner Drives: cars Join Date: May 2011 Location: Oversneeze Posts: 4,544	Pulling on a part while on a lift won't verify anything unless it's completely broken. Tighten the crap outta everything, especially sway bar end links. Use loctite. That solves 90% of issues. There's a lot of slop in a stock drivetrain which also contributes.