Home » Public Forums » GMCnet » Bumps felt through Steering Wheel
| Re: [GMCnet] Bump felt through Steering Wheel [message #308888 is a reply to message #308884] |
Mon, 17 October 2016 12:50   |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma:
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Senior Member |
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Bill,
Have you tried making tight turns, especially to the left, in a large
parking lot? You want almost full lock, but not quite, turns. If you feel
roughness similar to your "bumps", I'd suspect worn CV joints, especially
the left one.
As for the "tramlining", which I assume is your term for what we here
generally call "rut following", you should consider "true-tracks" on the
center wheels. If you're not familiar with them, they're cam followers
(large caged roller/ball bearings) mounted on the rear of the suspension
arms. Those run in vertical tracks attached to the frame rails so that the
suspension arms are constrained from lateral movement. Without those, the
best description I know for the center wheels is that they act like
one-handled wheelbarrows. The true tracks are the best single thing I've
done to my GMC's handling during 18 years of doing 'most everything.
HTH,
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, etc., etc., etc.
www.gmcwipersetc.com
On Mon, Oct 17, 2016 at 1:34 PM, Bill Van Vlack
wrote:
> Driving down the road at 60 or so, I find myself correcting left and right
> due to - I think - tramlining since it tends to go away on smooth roads.
> But that's not the issue I'm concerned about....
>
> When I correct back to the left, I feel bumps through the steering wheel
> while the wheel is held steady - meaning that there are no bumps when
> turning
> the wheel, but bumps when the wheel is held with the wheels pointed
> slightly left. Something like 10 bumps with the wheel held left for 2-3
> seconds.
> Once in a while I think I notice a bump or two when steering to the right
> as well, but I can't be certain.
>
> Prior to noticing this (although it may have been there since we acquired
> the coach a year ago), I'd corrected the lower steering column/steering box
> angle, cleaned and re-lubed the balls in the lower steering column CV
> joint (in place, didn't remove the balls), replaced the front calipers with
> 80mm
> (including grinding to fit), replaced the relay arm and drag link, and
> aligned toe-in to zero.
>
> What can be causing this?
> --
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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