| [GMCnet] vibration on hard acceleration [message #309197] |
Sat, 22 October 2016 18:07  |
glwgmc
Messages: 1014
Registered: June 2004
Karma: 10
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Nature of the beast. Many experience torque steer on acceleration uphill, especially while turning. Just lighten up on the gas until your wheels are straight again.
Jerry Work
Kerby, OR
Message: 6
Date: Sat, 22 Oct 2016 11:00:18 -0700
From: "Lorne Rosenblood"
To:
Subject: [GMCnet] vibration on hard acceleration
Message-ID:
Content-Type: text/plain; charset="utf-8"
I have a mild vibration or shaking of the front wheels on hard acceleration particularly up a steep hill. I have Manny?s front end.
The front engine mount is only a few years old.
Any suggestions on where to look for the problem. CV joints?
Lorne Rosenblood
Victoria, BC
........,.....:
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Jerry & Sharon Work
78 Royale
Kerby, OR
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| Re: [GMCnet] vibration on hard acceleration [message #309199 is a reply to message #309197] |
Sat, 22 October 2016 18:13  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Lorne, we have had a fair amount of experience with torque steer. Like a
couple of others have stated, a bit less throttle helps, and I have found
that a bit of toe out (no more than 1/8") will help also.
Jim Hupy
On Oct 22, 2016 4:08 PM, "Gerald Work" wrote:
> Nature of the beast. Many experience torque steer on acceleration uphill,
> especially while turning. Just lighten up on the gas until your wheels are
> straight again.
>
> Jerry Work
> Kerby, OR
> Message: 6
> Date: Sat, 22 Oct 2016 11:00:18 -0700
> From: "Lorne Rosenblood"
> To:
> Subject: [GMCnet] vibration on hard acceleration
> Message-ID:
> Content-Type: text/plain; charset="utf-8"
>
> I have a mild vibration or shaking of the front wheels on hard
> acceleration particularly up a steep hill. I have Manny?s front end.
> The front engine mount is only a few years old.
> Any suggestions on where to look for the problem. CV joints?
>
> Lorne Rosenblood
> Victoria, BC
>
>
> ........,.....:
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: [GMCnet] vibration on hard acceleration [message #309210 is a reply to message #309197] |
Sun, 23 October 2016 08:02 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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I'm betting wheelspin.
Which I didn't recognize in a minivan until someone watched as it strated up... Dodge with a bigger engine than the last few, I was punching it too mucgh. Samesame with the coaches.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] vibration on hard acceleration [message #309211 is a reply to message #309210] |
Sun, 23 October 2016 09:52 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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A stock GMC with an OEM front end will normally not torque steer or spin
the tires. But, put a bunch more horsepower and torque into the same coach,
and you most certainly will experience it, particularly while turning and
when weight transfers off of the front end. Adding extended wheel spacers
to the stock front hubs will do the same thing. So will the 1 ton.
Solution? Keep your foot out of the tie rods. Your fuel mileage will
improve too.
If you want to play with the big dogs, expect and prepare to pay for it.
I've been there and done that. Even got the T-shirt as evidence.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Oct 23, 2016 6:03 AM, "Johnny Bridges via Gmclist" <
gmclist@list.gmcnet.org> wrote:
> I'm betting wheelspin.
> Which I didn't recognize in a minivan until someone watched as it strated
> up... Dodge with a bigger engine than the last few, I was punching it too
> mucgh. Samesame with the coaches.
>
> --johnny
> --
> '76 23' transmode Norris upfit, 76 26' Eleganza(?) with beaucoup mods and
> add - ons.
> Braselton, Ga.
>
> "Sometimes I wonder what tomorrow's gonna bring when I think about my
> dirty life and times" --Warren Zevon
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] vibration on hard acceleration [message #309213 is a reply to message #309211] |
Sun, 23 October 2016 11:43 |
Bullitthead
Messages: 1411
Registered: November 2013
Karma: 5
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Torque steer is not a vibration or even a thumping, it is a pull from uneven torque distribution that is not being cancelled out by the mass of the vehicle and is instead transmitted to the steering system which is not an inflexible system. Uneven torque will exacerbate ANY looseness in the mounting of the driving wheel system, front or back. You just don't notice it much in a rear wheel drive system because the lever arm is the length of the wheelbase and unless you have a lot of power and traction you will have much greater control of the resultant torque offset. As others have said, lengthening the axles will amplify the effect, but that is not what I would call a vibration. The wheel slippage could cause a vibration if the tire is not round and is a possibility, but most drivers know when they are burning rubber or losing traction. I know it when I spin the right front tire on takeoff in my GMC and in the FWD minivan, and it does not cause a vibration, just smoke and smell and a thumbs up from the spectators riding in the back of the pickup truck at the corner store! 
Going uphill, weight load is taken away from the front end and ANY play in that system is going to have more opportunity to show itself. You need to check those 4 ball joints thoroughly and with less than full weight load on the wheels and do the same for the tie rod and other linkage joints. Perform Rob Mueller's front end check carefully and then do it again with the system loaded at different amounts. Also check the front wheel bearings for ANY play at different load heights and make sure the bearing assemblies are not loose in the knuckles. Make sure ALL of the engine mounts are secure and the axles are tight to the final drive. Jack both front wheels off the ground by the bottom of the control arms, put stands under the frame, and spin the wheels with the engine while turning the steering lock to lock. Use the service brake to apply some load to them and repeat the test while observing the wheels from outside. Watch for any wobble or bounce in the wheels. This WILL require a qualified operator at the wheel, someone that does not panic first and faint later. DO NOT get under the vehicle during this type of testing and DO NOT stand in the travel path in case a jackstand breaks, and make sure it will not drive into a building or other obstruction if something gives way unexpectedly.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: [GMCnet] vibration on hard acceleration [message #309401 is a reply to message #309211] |
Tue, 25 October 2016 14:19 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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Senior Member |
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My new rebuild with a better cam, headers, 3.70 posi, but stock spindles torques all over the place when you get on it when turning from a stop. It's pretty cool I think.
Arrrgh arrrgh!
----------------------------------------
>
> A stock GMC with an OEM front end will normally not torque steer or spin
> the tires. But, put a bunch more horsepower and torque into the same coach,
> and you most certainly will experience it, particularly while turning and
> when weight transfers off of the front end. Adding extended wheel spacers
> to the stock front hubs will do the same thing. So will the 1 ton.
> Solution? Keep your foot out of the tie rods. Your fuel mileage will
> improve too.
> If you want to play with the big dogs, expect and prepare to pay for it.
> I've been there and done that. Even got the T-shirt as evidence.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403
>
> On Oct 23, 2016 6:03 AM, "Johnny Bridges via Gmclist" gmclist@list.gmcnet.org> wrote:
>
>> I'm betting wheelspin.
>> Which I didn't recognize in a minivan until someone watched as it strated
>> up... Dodge with a bigger engine than the last few, I was punching it too
>> mucgh. Samesame with the coaches.
>>
>> --johnny
>> --
>> '76 23' transmode Norris upfit, 76 26' Eleganza(?) with beaucoup mods and
>> add - ons.
>> Braselton, Ga.
>>
>> "Sometimes I wonder what tomorrow's gonna bring when I think about my
>> dirty life and times" --Warren Zevon
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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