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#1
10-07-2009, 09:43 AM
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96 Sub -- Rumbles at high speed
This is a K1500, 5.7L, 4x4, 170,000 miles
When it gets above 50 or so there is a low rumble vibration you feel in the seat or floor. Not in the steering wheel so much. Began to do it after a long trip we took recently. Slow to 40 or 50 mph it seems smooth. No idea, but thought it was tires needing spin balanced which has solved vibrations in the past. They're old -- bought 'em 40,000 miles ago from TiresPlus w/ free lifetime spin balance. Far as I can tell, they still look good with lots of tread left (Dunlop Radial Rovers 245 75 R16). Just had TP do another spin but no change. No apparent dents in the alloy rims. Before this situation, when tires were balanced, Sub ran smooth as butter even at high speed. Any thoughts. Tires? Something worse? THANKS - Steve 
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#2
10-07-2009, 11:17 AM
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Re: 96 Sub -- Rumbles at high speed
You may have some worn out axle bearings. Also check the engine and transmission mounts for wear. Then check your shaft u-joints for excessive play. Finally, if the rear driveshaft has a carrier bearing, it may be worn.
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Current Garage: 2009 Honda CR-V EX 2006 Mazda 3i 2004 Chevrolet Silverado 2500HD 2003 GMC Envoy XL 2000 Honda ST1100 2000 Pontiac Sunfire Vehicle History: 2003 Pontiac Vibe AWD - 1999 Acura Integra GS - 2004 4.7L Dakota Quad Cab 4x4 - 1996 GMC Jimmy 4wd - 1995 Chevrolet C2500 - 1992 Toyota Camry LE 2.2L - 1992 Chevrolet S10 Ext. Cab 4.3L - 1995 Honda ST1100 - 1980 Yamaha XS400 - 1980 Mercury Bobcat.
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#3
10-07-2009, 06:45 PM
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Re: 96 Sub -- Rumbles at high speed
Bad U joints can cause strange things to happen, from high speed rumbles to vibrations only while slowing down or braking and then there is the obvious clunk that happens when first shifting into gear
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#4
10-07-2009, 06:52 PM
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Re: 96 Sub -- Rumbles at high speed
Try this to determine if it's engine or drive line related: Take it up beyond the speed that it starts to rumble and shift the tranny into neutral and let the motor go to idle. If it's still there and you suspect tires, try to find a buddy who will swap tires and rims with you for a test.
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57 Chevy 210 65 Olds 442 Convertible (Another one sold) 75 GMC Vandura 3/4 Ton 1999 K2500 Old Body Style Suburban (Gone but not forgotten) 05 Dodge Ram 3500/5.9 Cummins 2012 Toyota FJ Cruiser
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#5
10-08-2009, 09:57 AM
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Re: 96 Sub -- Rumbles at high speed
Quote:
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