i hear Klunking and a feel Bucking ?!

leathal injection · 04-28-2004, 11:42 AM

i have a 90 mustang w/mods listed below.

When im driving my car slow at low rpms, around 1500 i hear a Klunking and my car starts bucking my head back an fourth ?? Any ideas , U-joints Torque Boxs ? please help thanks

crazypete · 04-28-2004, 01:24 PM

Sounds like:

Your clutch is _gone_ and it's slipping hard. Usually slipping clutches will do their thing at low rpms and will stop at higher rpms. It causes the car to jolt hard back and forth like you described.

The clunk could be a tranny crossmember thats ready to check out and the jarring motions are causing the x-member to slap against the bottom of the car. I've had both of these things happen to me.

04-28-2004, 11:42 AM	#1
leathal injection Registered Member Join Date: Mar 2004 Location: Long Island Posts: 58	i hear Klunking and a feel Bucking ?! i have a 90 mustang w/mods listed below. When im driving my car slow at low rpms, around 1500 i hear a Klunking and my car starts bucking my head back an fourth ?? Any ideas , U-joints Torque Boxs ? please help thanks __________________ 1990 Mustang GT Engine- 308 (bored .40 over) Probe Forged pistons (10.5:1), Scat forged crank and rods, w/Main Girdle, AFR 185 heads, GT-40 intake, CSI electric water pump. AC delete kit, No smog pump, Manual rack and pinion steering. Ignition- MSD 6AL, MSD Blaster coil, MSD hellicore wires. Drive Train- Tremic 3550, Alum. Drive shaft, 3:73 gears, Stock carrier and axels. 26X11.5 M/T Et streets. Power adder- 175 shot of laughing gas. Best ET 11.5 @120mph on squeeze, 12.4 @109mph on muscle (on gt40 heads) on the 185 heads ... ??? tba

04-28-2004, 01:24 PM	#2
crazypete Registered Member Join Date: Sep 2002 Location: Boston Posts: 592	Sounds like: Your clutch is _gone_ and it's slipping hard. Usually slipping clutches will do their thing at low rpms and will stop at higher rpms. It causes the car to jolt hard back and forth like you described. The clunk could be a tranny crossmember thats ready to check out and the jarring motions are causing the x-member to slap against the bottom of the car. I've had both of these things happen to me. __________________ 91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior

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