The Dancing Avion

[dean hanson]

Throwing this out to the community as I have not found the answer. My 26' -
1975 Avion, with 72K miles, in storage for 5 plus years, now with about 100
local miles and no freeway excursions, "dances" from one drive wheel to the
other, when accelerating from a stop. Especially, if I put the pedal to the
metal or am turning right or left. It stops traction on one wheel and shifts
to the other side. Rapidly back and forth. I swapped CV's with no change.
It's driving me nuts to find what to fix.



Dean C. Hanson

P.O.Box 2096

Fremont, Ca. 94536

(510) 657-9600

 

[Jim Hupy]

Nothing to fix. Ease up on the throttle a bit. What you are experiencing is
called "torque steer" somewhat common to front drive vehicles. Be sure your
tire inflation is correct for the weight on the front end, and that
alignment is correct.
Jim Hupy
Salem, Or
78 GMC ROYALE 403

On Fri, Apr 12, 2019, 8:05 AM Dean Hanson via Gmclist <

> Throwing this out to the community as I have not found the answer. My 26' -
> 1975 Avion, with 72K miles, in storage for 5 plus years, now with about 100
> local miles and no freeway excursions, "dances" from one drive wheel to the
> other, when accelerating from a stop. Especially, if I put the pedal to the
> metal or am turning right or left. It stops traction on one wheel and
> shifts
> to the other side. Rapidly back and forth. I swapped CV's with no change.
> It's driving me nuts to find what to fix.
>
>
>
> Dean C. Hanson
>
> P.O.Box 2096
>
> Fremont, Ca. 94536
>
> (510) 657-9600
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

 

[Jim Hupy]

Particularly toe in. Try these specs. Ride height on the front needs to be
correct before alignment. Yours Is most likely low. Camber 0°, Caster +3°,
Toe, out 1/16" to 1/8". Drive the coach several miles after ride height
adjustments. Do NOT just bounce the front bumper. Jerry Work has an online
step by step alignment summary. I suggest that you look at that. Very well
done.
Jim Hupy

> Nothing to fix. Ease up on the throttle a bit. What you are experiencing
> is called "torque steer" somewhat common to front drive vehicles. Be sure
> your tire inflation is correct for the weight on the front end, and that
> alignment is correct.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403
>
> On Fri, Apr 12, 2019, 8:05 AM Dean Hanson via Gmclist <

>
>> Throwing this out to the community as I have not found the answer. My 26'
>> -
>> 1975 Avion, with 72K miles, in storage for 5 plus years, now with about
>> 100
>> local miles and no freeway excursions, "dances" from one drive wheel to
>> the
>> other, when accelerating from a stop. Especially, if I put the pedal to
>> the
>> metal or am turning right or left. It stops traction on one wheel and
>> shifts
>> to the other side. Rapidly back and forth. I swapped CV's with no change.
>> It's driving me nuts to find what to fix.
>>
>>
>>
>> Dean C. Hanson
>>
>> P.O.Box 2096
>>
>> Fremont, Ca. 94536
>>
>> (510) 657-9600
>>
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>

 

[Ken B]

Well Mr. Jim beat me to this posting.

Mine did that for several years until I set the front and rear heights exactly and it all went away. Follow Jim's specs.

One other thing is to check the lower A frame bushings. If they are worn the alignment will change as you accelerate and decelerate because the pull
of the driving wheels causes the lower a frame to move forward and backwards on the bad bushings. If you replace them get the urethane ones from
Energy Suspension.

> Particularly toe in. Try these specs. Ride height on the front needs to be
> correct before alignment. Yours Is most likely low. Camber 0°, Caster +3°,
> Toe, out 1/16" to 1/8". Drive the coach several miles after ride height
> adjustments. Do NOT just bounce the front bumper. Jerry Work has an online
> step by step alignment summary. I suggest that you look at that. Very well
> done.
> Jim Hupy

--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

 

[jim kanomata1]

Sometimes the steering box is not clocked off center and the excess play
will amplify the torque steer.

On Sat, Apr 13, 2019 at 3:22 AM Ken Burton via Gmclist <

> Well Mr. Jim beat me to this posting.
>
> Mine did that for several years until I set the front and rear heights
> exactly and it all went away. Follow Jim's specs.
>
> One other thing is to check the lower A frame bushings. If they are worn
> the alignment will change as you accelerate and decelerate because the pull
> of the driving wheels causes the lower a frame to move forward and
> backwards on the bad bushings. If you replace them get the urethane ones
> from
> Energy Suspension.
>

> > Particularly toe in. Try these specs. Ride height on the front needs to
> be
> > correct before alignment. Yours Is most likely low. Camber 0°, Caster
> +3°,
> > Toe, out 1/16" to 1/8". Drive the coach several miles after ride height
> > adjustments. Do NOT just bounce the front bumper. Jerry Work has an
> online
> > step by step alignment summary. I suggest that you look at that. Very
> well
> > done.
> > Jim Hupy
>
>
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502