knock sound from rear when upshifting?

crazy5.0 · 02-05-2002, 08:09 PM

Right when I release the clutch there is a very slight knock sound. This usually only happens after around 10-15 mins and only when upshifting. It doesn't get louder if I speed shift. I crawed under the car to wiggly the driveshaft if it's loose and there is almost no play,but I can make it move maybe a 1/16 of an inch at the most.

5ohCOUPE · 02-05-2002, 09:28 PM

Possibly a control arm bushing or maybe a torn torque box, but if it only does it after 10 or 15 minutes check the clearance of the exhaust system. See if it is hitting the axle or anything else.

chris91LX · 02-05-2002, 10:02 PM

I had the exact same problem and it was a nut that had come loose on one of the upper control arms. Make sure they're all tight.

02-05-2002, 08:09 PM	#1
crazy5.0 Registered Member Join Date: Nov 2001 Location: Mission Viejo,Ca Posts: 37	knock sound from rear when upshifting? Right when I release the clutch there is a very slight knock sound. This usually only happens after around 10-15 mins and only when upshifting. It doesn't get louder if I speed shift. I crawed under the car to wiggly the driveshaft if it's loose and there is almost no play,but I can make it move maybe a 1/16 of an inch at the most. __________________ 89gt,3.27's,Auburn,tremec 3550,Steeda tri-ax,aluminum driveshaft,Asp underdrives,Flowmast er 3 chamber,March ram air,130 amp alternator,Koni yellow struts,Kyb shocks,Pirelli p-6000's,MM's lower control arms and full length subs

02-05-2002, 09:28 PM	#2
5ohCOUPE Registered Member Join Date: Sep 2001 Location: ORANGE PARK FL. USA Posts: 208	Possibly a control arm bushing or maybe a torn torque box, but if it only does it after 10 or 15 minutes check the clearance of the exhaust system. See if it is hitting the axle or anything else. __________________ 91 LX COUPE, 3.73 gears, 2 1/2 inch H-Pipe, 1 5/8 MAC long tube headers, 73 MM C&L MAF, 70 MM MAC TB, LUNATI cam,1.7 TFS Rockers, TFS Track Heat heads, TFS Track Heat intake, T5 with PRO 5.0 shifter, Griffin aluminum radiator, Fluid Damper, SSM traction bars, 190 GPH in tank fuel pump. And more to come.

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02-05-2002, 10:02 PM	#3
chris91LX Registered Member Join Date: Oct 1998 Location: Suburban Chicago, Hanover Park Posts: 695	I had the exact same problem and it was a nut that had come loose on one of the upper control arms. Make sure they're all tight.