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My 07 has always been very sensitive to this.
The good old spin balance doesn't cut it.
The balance has to be perfect or i get 50-60 shimmy.
I've seen a lot of posts like this.
Find a shop with a Road Force balancer & good luck.
2007 Premium Pony Package | Satin Silver | 5R55S
Interior Upgrade Package | Performance Package
Bama Doug's 91P | 8.8 Rear-FRPP 4.10 | 4" Shaftmasters
GTM's & Pypes X | C&L CAI | CHE K Brace | OEM P&P TB
SMR ST Brace | TCI Ratchet Shifter | 8" Shorty
CDC Sequentials | Flat Black Aeroform Chin Spoiler
Satin Silver Roush Hood Scoop & Vtech 1/4 Louvers
OEM PP Silver 17x8's - F 235/55/17 - R 255/50/17
Take it to a different shop.. one that has a road force balance. I say different shop because they will look at it fresh.. and hopefully cover things the first place will assume they have covered.
I had the same problem with OEM brembo/track pack wheels I bought locally. The wheels with OEM tires literally had no miles on them.. the guy I bought them from had the wheels swapped out when the car was delivered to the dealership.
The dealership, however, took out the TPMS and didn't rebalance the wheels. When I put them on.. the shake was bad..
Took it to Dobbs and they threw what looked like 10 lbs of weights on.. said they had trouble and they couldn't be OEM. Go figure.
Took it to another shop.. to a mustang guy.. and he balanced them right up with no issues.. and barely any weights.
He said, many places don't go through the trouble to deflate the tire, and rotate it on the rim to get the right balance. That's all he had to do to get mine balanced.. no road force needed.
Yes, have the wheels and tires "road force" balanced. I would also do an alignment since you got four new tires. Not suspecting a bent rim here cause you said it didn't happen before the new tires, anytime I get a shimmy its because of a bent rim but thats what I get for riding on 20's in and around the NYC area.
2006 Mustang Pony Package
-GT/CS Front and Rear bumpers
-20" Shelby gunmetal razor rims-255/35/20 Falken FK452's (stock bullitts with blizzaks- winter setup)
-Custom dual exhaust with stock GT mufflers
-Roush rear lowering springs- J&M LCA's
-6000k HID's headlights from retrosolutions
-35% tint all windows
-Sequential taillights from american muscle
Location: PA to KY ('07) to IL ('09) to MS ('10) to FL ('11)
Ditto the RoadForce balance. It'll pick up tire and wheel problems that a regular spin balance will not catch.
If the car is bouncing at low speeds, you either have a defective tire (likely a bad belt) or a bent rim. If it's the tire, the shop should replace it free since they're new. I had that problem with a Goodyear tire from TireRack.
Additionally, if you recently installed aftermarket wheels, your shop needs to remove any of the wheel lug clips leftover from the assembly line (which are not required for vehicle operation). They prevent most aftermarket wheels from sitting flush with the rotor.
I had a similar issue with my 2013 after putting new tires on. But the shake felt more toward the rear - had Ford check for suspension issues, driveshaft, and they did find a problem with the transmission that ended up getting rebuilt under warranty.
Still had the shaking though. So road force balance and found one tire, on the rear, was causing it. Replaced it and all was fine, until about 3 weeks ago and the shaking started back up. Stopped at Discount Tire where I purchased the tires and asked them to do the road force (they call it something else) - and a problem was found with a second tire on the rear. Replaced that one and no shaking.
One other question. Do you have aftermarket wheels? If so, and if the brakes were never replaced you may have one of the assembly clips still on a lug nut. It will cause a shake with aftermarket wheels if you don't remove it; the stock wheels have a clearance area on them so that clip isn't a problem.
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