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Vibration and knocking sound at highway speeds

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Old 12-07-2006, 01:41 AM
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Car: 91 Z28
Engine: L98
Transmission: 700R4
Vibration and knocking sound at highway speeds
1990 Firebird
LO3 with 180,xxx miles
700R4

Things I have tried/checked:
front wheel bearings
front brake rotors/calipers/pads
front tires balanced and rotated

I only feel it through the floorboard. It does not transmit through the steering wheel.

Any help is appreciated
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Old 12-07-2006, 05:40 AM
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Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Originally Posted by 90_WS6_Formula
I only feel it through the floorboard.
Transmission mount or perhaps cross member?

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Old 12-07-2006, 08:41 AM
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Car: 1984 camaro
Engine: 350
Transmission: th 350
Axle/Gears: 3:42
try the torque converter bolts make sure that they are tight also make sure the bellhousing bolts are tight.
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