I cant believe this is still problem after 10 years of this model. This has been going on since 2010 folks. Its not the tires, suspension, or any theory you guys came up with... its the design of the steering.. its upsetting that toyota just left that shit alone after all these years
It's been going on since Toyota switched to steering racks on their trucks and SUVs. So '95 with the introduction of the Tacoma, then the 4Runner in '96.
Steering racks are more sensitive to any tire uniformity or wheel run-out issue. Trucks and SUVs have bigger, heavier tires than cars, so any tire uniformity or wheel run-out issue is more likely to be felt.
The upside to using steering racks is that the steering is more precise than the old recirculating ball systems.
So it generally IS a tire or wheel issue. Of course if we're talking an old vehicle with worn chassis components (ball joints, tie-rods, etc.) that can contribute to uniformity/run-out issues being more readily felt.
Some tire manufacturers just do a better job building round tires. I avoid the ones that have a hard time doing that. Having a competent tech installing and balancing the tires also helps.
Unequal PSI as in 1-2 pounds?
When you say trucks and SUV's does this apply to other makes and models? I have no experience with other makes but am curious whether truck/suv drivers just accept this as normal truck behavior?
Finally was able to get into the tire shop to have the tires rebalanced. Road force balancing did the trick. T4R drives like new again! Tech said the original installer just slapped on the weights in one inside location instead of placing them on the wheel width wise as needed. Good guy at Discount Tire who went the extra mile. Took him about 20 minutes top.
Thanks for the suggestions and the most obvious solution usually works!
this is great to hear. I've been battling same issue w/ my 2016 4 Runner. had a slight shimy at 60mph but thought it was just the new tires they put on. I've since had re balanced 3 times at Big O' Tires. Going to a discount tire on Wednesday. Anything specific I should ask for?
Ask for road force balancing if possible.
I have to ask out of curiosity. What tires are you running (if they are AT3Ws, ugh)?
I know this is an older thread, but has anyone tried this? My wife 2019 4Runner the wheel started shaking between 50-65 mph. Found this on some car guru page. If you have slack in the drivers side CV
TOYOTA 8" CLAMSHELL CV AXLE BUSHING
Scroll way down to you get to a post by a guy name Levi.
Toyota 4Runner Questions - What will cause a steering wheel shimmy at 60-65mph other than tires, ... - CarGurus