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02-15-2011, 01:47 PM | #1 |
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Truck starts to shake when going 25-30mph???
Ok I have a 2 problems. (#1) I was driving my '70 lwb c/10 on saturday and it started to shake when I was going about 25-30mph. I pulled over and couldn't really figure it out what was wrong? So I got back in and did the same thing again around 25-30mph, if I speed up it kind of lets off and if I slow down the shaking slowly starts to fade out. Not sure what it could be? Could it be that my shocks need replacing? (#2) Noticed that a had a small spot on the concrete where something was leaking under my truck. It was a very small leak from the speedometer cable was. So I tightened it and it stopped. Now my speedometer needle jumps back and forth between 30-50mph on the gauge. What can I do/adjust so that it doesnt leak and I dont have the speedometer needle jumping all over the place. Any help is appreciated, thanks!!!
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1970 CST/10 LWB 350 1984 Blazer |
02-15-2011, 01:58 PM | #2 |
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Re: Truck starts to shake when going 25-30mph???
hopefully the shake is something as simple as a wheel out of balance. Maybe threw one of your balance weights?
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02-15-2011, 02:20 PM | #3 |
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Re: Truck starts to shake when going 25-30mph???
I am going to be getting an alignment and new tires hopefully this friday. Could it be shaking like that because it needs an alignment?
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1970 CST/10 LWB 350 1984 Blazer |
02-15-2011, 02:22 PM | #4 |
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Re: Truck starts to shake when going 25-30mph???
if not the wheels, check the driveshaft support (usually it's a vibrating shake) just an idea..
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02-15-2011, 02:26 PM | #5 |
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Re: Truck starts to shake when going 25-30mph???
Shaking could be caused by several things including wheel balance, tire defects, worn out suspension components, mis-adjusted wheel bearings, etc, or any combo of. Tell the alignment shop about the shaking. They will do an inspection and advise of problems.
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02-15-2011, 02:30 PM | #6 |
oldschoolblazer@yahoo.com
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Re: Truck starts to shake when going 25-30mph???
I agree that you might have lost a wheel weight.
You might also check your tires to see if any of them have separated just run your hand along the top of the tire to see if you feel a Lump. |
02-15-2011, 02:36 PM | #7 |
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Re: Truck starts to shake when going 25-30mph???
When a buy new tires and get the alignment, do they check/replace wheel weights if needed?
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02-15-2011, 02:50 PM | #8 |
oldschoolblazer@yahoo.com
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Re: Truck starts to shake when going 25-30mph???
Most shops that mount your tires will also balance them.
(but there usually is an additional fee) |
02-15-2011, 02:59 PM | #9 |
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Re: Truck starts to shake when going 25-30mph???
my 67 would shake at 30 to 40 having a few trucks with a two piece drivelines i knew it was the carrier berring the berings are usally good but the rubber that supports them rots good luck hope this helps
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02-15-2011, 03:00 PM | #10 |
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Re: Truck starts to shake when going 25-30mph???
Hey bro it sounds like your driveshaft. I would pick up some new u joints. I got mine from oriellys on grant and silverbell. They always have them in stock. Put them in and made sure the drive shaft was sitting right on the carrier bearing. After doing that, no more shake.
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02-15-2011, 03:03 PM | #11 |
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Re: Truck starts to shake when going 25-30mph???
I'm gonna go see if its the wheel weight that's missing first by taking it in to get them balanced after I get my new tires. I hope that's all it is!
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02-15-2011, 03:08 PM | #12 |
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Re: Truck starts to shake when going 25-30mph???
Hey bro also check out your hole front end and look at all the boots. wait is it shaking from the front or rear.
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02-15-2011, 03:12 PM | #13 |
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Re: Truck starts to shake when going 25-30mph???
Feels like its shaking from the front passenger side.
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02-15-2011, 03:16 PM | #14 |
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Re: Truck starts to shake when going 25-30mph???
I wonder if it is a bearing.
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02-15-2011, 03:38 PM | #15 |
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Re: Truck starts to shake when going 25-30mph???
All these suggestions are good, but I'd think they would cause a constant vibration. Except my original thought, wheel balance, which tends to only happen at certain speeds. What that speed is can vary, but is worse at some certain "resonant" rotation velocity of the misbalanced wheel.
Most tire shops mount and balance new tires for "free", which means they already included it in the cost of the tire(s). Alignment usually cost some bucks though. Good luck1 |
02-15-2011, 03:48 PM | #16 |
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Re: Truck starts to shake when going 25-30mph???
Yeah might be that the tires need to be balanced. Since I'm getting new tires this week I'll be getting them balanced too, hopefully thats what it takes. I also need an alignment so that will be another thing to cross off the checklist, thanks to everyone who replied!
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02-15-2011, 03:55 PM | #17 | |
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Re: Truck starts to shake when going 25-30mph???
Quote:
Let us know when you track it down. Vex Posted via Mobile Device
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02-15-2011, 04:11 PM | #18 |
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Re: Truck starts to shake when going 25-30mph???
check your u-joints. i had the same exact problem at 25-30 mph. and 2 u-joints were worn.
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02-15-2011, 04:14 PM | #19 |
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Re: Truck starts to shake when going 25-30mph???
Is this a shake you're feeling in the steering wheel? or more in the seat, like it's coming from underneath the truck?
Is it like a humming vibration, or a physical shake (the steering wheel moves when it shakes) . ? coming from the RH Front, I'm leaning away from the drive shaft, just my .02. Have you hit any big pot holes on that side recently? Does it make a clunking sound when you turn to the left at 20-30 mph.. going up / down a freeway ramp or somehting?
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02-15-2011, 04:15 PM | #20 |
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Re: Truck starts to shake when going 25-30mph???
i'd check to see if the lugnuts are tight
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02-15-2011, 04:34 PM | #21 | |
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Re: Truck starts to shake when going 25-30mph???
Quote:
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02-15-2011, 04:56 PM | #22 |
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Re: Truck starts to shake when going 25-30mph???
My vote goes U joints! my Jimmy did this till i swapped them out! shook sooo hard that it would move my rear view mirror, then i speed up or slow down and it goes away
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02-15-2011, 05:26 PM | #23 |
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Re: Truck starts to shake when going 25-30mph???
I thought you mentioned Front Pass side ? Yes, if it's coming from under the seat, definately in the drive shaft, U-Joints, Carrier Bearing, or Pinion angle. Is the truck lowered?
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Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 *Currently underway* 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet *Sold* 1985 Silverado Short Fleet *Sold* 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride) |
02-15-2011, 05:28 PM | #24 |
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Re: Truck starts to shake when going 25-30mph???
if it ends up being your drivesaft. Take both pieces of your driveshaft to a shop that works with drivelines. They will have the equipment and theknowlede to fix your driveshaft right, and they will be able to ballance the shaft as an assembly.
I've seen many people who call themselves mechanics mess up a driveline job because they don't have a clue how it works. It's not just a metal stick between the trans and rear end.
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02-15-2011, 05:29 PM | #25 |
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Re: Truck starts to shake when going 25-30mph???
Yes I did say it felt like it was coming from the front passenger side. I just said I feel the shaking more in the seat than I do the steering wheel like you had asked. The truck is not lowered its all stock.
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