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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Sep 2003 Posts: 151 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2003 Posts: 151 | OK, "46 Chevy 1/2 T Panel Delivery, 350 SBC, Heidts cross member & Suspension, Flamming River manual rack. I've got a pretty good shimmie around 50/60 MPH and a little at low speed. I had 1 bad inner and 1 outer rod ends that were replaced and had the front end aligned at a good shop and watched it being done.
The final numbers are:
all numbers are degrees
Caster- L-1.4 R-1.5
Camber- L -1.1 R-1.4
Toe- 0.15 both
The wheels are Weld Wheel Pro Stars, 15" X 7"
We are thinking it might have something to do with the moveable weight thats inside the rims. Oh and the front coils are Eaton 350lbs.
Any ideas??
Thanks
David
Just a firefighter,
Cleverly disguised as a responsible adult
'46 1/2 T Panel
| | | | | Joined: Oct 2004 Posts: 348 Shop Shark | | Shop Shark Joined: Oct 2004 Posts: 348 | check your wheels and tires for balance | | | | | Joined: Sep 2003 Posts: 151 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2003 Posts: 151 | Thanks John forgot to put that we already did that.
David
Just a firefighter,
Cleverly disguised as a responsible adult
'46 1/2 T Panel
| | | | | Joined: Feb 2007 Posts: 434 Shop Shark | | Shop Shark Joined: Feb 2007 Posts: 434 | Is that toe measure toe out or toe in? Toe in will be more stable than toe-out. Are you measuring in degrees or inches?
More caster will also track straighter than less. That isn't what I would consider a lot of castor. It is not uncommon for Miata's to run 5 degrees of castor.
Just for grins, have you checked all the ball joints for play, lug nuts for torque, shock bolts for torque, and alignment bolts for torque, control arm bushings for play? While loose lugs usually show up as an off-throttle vibration, they often are not torqued. How about the rear lugs and spring shackles, axle bolts?
Finally, are all four tires at the air pressure you expect them to be?
R-Bo
1959 Apache 1/2 ton Big Window, Short bed Fleetside (under reconstruction)
1966 GMC 305V6 in the family
| | | | | Joined: Oct 2006 Posts: 4,983 Master Gabster | | Master Gabster Joined: Oct 2006 Posts: 4,983 | If you had the tires balanced it should have taken in consideration the lead weights.
~Jim
| | | | | Joined: Mar 2008 Posts: 3,750 'Bolter | | 'Bolter Joined: Mar 2008 Posts: 3,750 | Just a long shot here.... Years ago I had a VW bug with a 'shimmy'. I eventually traced it to a REAR tyre.
The sidewall was buckled and the shake transmitted through the whole car! Just a thought?
1950 Chevy Advance Design 3100 in ScotlandIn the Stovebolt GalleryMore pix on Flickr. I've definately got this truck thing in my blood ... my DNA sequence has torque settings"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.
| | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | Tire or wheel issue, alignment will not cause a shimmy.
Bill Burmeister
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