Frontend shake? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

fun in dirt · 04-04-2008, 05:32 PM

I have an '01 GMC 2wd that has 3" lift spindles on it. It has a shake in the front end from about 50-65mph. Thought it was tires at one time & had them rebalanced, but didn't help. Later on got new tires & still no difference. Nothing seems to be loose. Some days it doesn't shake as bad as others, so I'm totally confused. Any ideas? My ole man says it probably has something to do with the geometry being screwed up because of the spindles.

SkylineNXS · 04-04-2008, 07:34 PM

The first thing i would look into is the brake rotors. If they are warped even the smallest amount, they will vibrate at a certain speed, depending on the amount of warp. When u press the brake pedal does it vibrate, even the smallest amount? If its not that or u allready eliminated that, then i would go with the spindles being a little off, possibly not machined perfectly, so u get a resonance at that speed...

BRAD

Sonny · 04-06-2008, 03:24 PM

Check ball joints and tie-rods for any play and shocks for wear. Any play in the rod ends will be amplified by the big tires. Same with the shocks if they are old; they will not be able to dampen te oscillations from the bigger tires.

fun in dirt · 04-09-2008, 08:09 PM

Thanks guys!
Maybe I should check about the trueness of the spindle, it's the only thing left, I've eliminated everything else?????????????

SkylineNXS · 04-10-2008, 06:44 AM

The only other thing i could think of is possibly bearings that arent doin what their supposed to? But other than that i have no idea, theres a million things that could do it, the problem is that its impossible to find the problem most times...

BRAD

04-04-2008, 05:32 PM	#1
fun in dirt Registered User Join Date: Jan 2007 Location: Mississippi Posts: 2,118	Frontend shake? I have an '01 GMC 2wd that has 3" lift spindles on it. It has a shake in the front end from about 50-65mph. Thought it was tires at one time & had them rebalanced, but didn't help. Later on got new tires & still no difference. Nothing seems to be loose. Some days it doesn't shake as bad as others, so I'm totally confused. Any ideas? My ole man says it probably has something to do with the geometry being screwed up because of the spindles. __________________ '72 C to K20 "Cannibalizer" http://67-72chevytrucks.com/vboard/s...32#post8653432 '85 K30 "Big Nassy" '06 3500 Duramax ...tow truck '06 Silverado SS...DD '06 C1500 WT...DD '07 Classic C1500 WT...DD Built & sold cause can't keep 'em all: '72 Blazer "The Bucket" http://67-72chevytrucks.com/vboard/s...d.php?t=433190 '55 Chevy straight axle gasser https://www.trifive.com/forums/showthread.php?t=173938 '69 Pro Street Chevelle http://www.chevelles.com/forums/showthread.php?t=332541 '86 M1031 CUCV http://67-72chevytrucks.com/vboard/s...d.php?t=553619

04-04-2008, 07:34 PM	#2
SkylineNXS Registered User Join Date: Oct 2006 Location: Elgin, IL Posts: 658	Re: Frontend shake? The first thing i would look into is the brake rotors. If they are warped even the smallest amount, they will vibrate at a certain speed, depending on the amount of warp. When u press the brake pedal does it vibrate, even the smallest amount? If its not that or u allready eliminated that, then i would go with the spindles being a little off, possibly not machined perfectly, so u get a resonance at that speed... BRAD __________________ 2000 GMC Sierra EXT Cab Short 4x4, finally mine... 1966 C10 SWB Fleet, 250 I6, three on the tree.... Previously Owned.... 1987 Chevy R10 "Silverado" (at least the badges were) Short Step 350 700r4.... 1972 Chevy LWB Fleet 350/350 EXTENDED CAB ALL THE WAY! .._..~...-...._...____ .._..-...______\|_\|__\____ ..-..~.\|_(O)__\|_\|__\|_(O)]

04-06-2008, 03:24 PM	#3
Sonny Active Member Join Date: Jan 2004 Location: Centerville, GA Posts: 240	Re: Frontend shake? Check ball joints and tie-rods for any play and shocks for wear. Any play in the rod ends will be amplified by the big tires. Same with the shocks if they are old; they will not be able to dampen te oscillations from the bigger tires. __________________ Sonny New Project: 67 Small window SWB 2006 Crew Cab Silverado LT

04-09-2008, 08:09 PM	#4
fun in dirt Registered User Join Date: Jan 2007 Location: Mississippi Posts: 2,118	Re: Frontend shake? Thanks guys! Maybe I should check about the trueness of the spindle, it's the only thing left, I've eliminated everything else????????????? __________________ '72 C to K20 "Cannibalizer" http://67-72chevytrucks.com/vboard/s...32#post8653432 '85 K30 "Big Nassy" '06 3500 Duramax ...tow truck '06 Silverado SS...DD '06 C1500 WT...DD '07 Classic C1500 WT...DD Built & sold cause can't keep 'em all: '72 Blazer "The Bucket" http://67-72chevytrucks.com/vboard/s...d.php?t=433190 '55 Chevy straight axle gasser https://www.trifive.com/forums/showthread.php?t=173938 '69 Pro Street Chevelle http://www.chevelles.com/forums/showthread.php?t=332541 '86 M1031 CUCV http://67-72chevytrucks.com/vboard/s...d.php?t=553619

04-10-2008, 06:44 AM	#5
SkylineNXS Registered User Join Date: Oct 2006 Location: Elgin, IL Posts: 658	Re: Frontend shake? The only other thing i could think of is possibly bearings that arent doin what their supposed to? But other than that i have no idea, theres a million things that could do it, the problem is that its impossible to find the problem most times... BRAD __________________ 2000 GMC Sierra EXT Cab Short 4x4, finally mine... 1966 C10 SWB Fleet, 250 I6, three on the tree.... Previously Owned.... 1987 Chevy R10 "Silverado" (at least the badges were) Short Step 350 700r4.... 1972 Chevy LWB Fleet 350/350 EXTENDED CAB ALL THE WAY! .._..~...-...._...____ .._..-...______\|_\|__\____ ..-..~.\|_(O)__\|_\|__\|_(O)]



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