Back seat shakes when I hit 75mph

I drive a 2017 TRD pro tundra with 35s but when I hit 75mph the back seat starts shaking any suggestions or is it normal thanks.

 

Could be the lift or tires out of balance.

 

Welcome, not normal.

 

@Jim LE 1301 had it balanced and is the stock lift of the pro.

 

If it's only a certain speed range and does it all the time at that speed, it's usually a tire out of balance. I would first try balancing again.

 

Most likely it's the wheels/tires. Yep, read that you had it balanced and still believe it's the sheels/tires. You can try moving the tires front to rear and see if that changes things.
Often the tire shop can't get it right and just send the customer out the door thinking everything is good.

 

I doubt it's the sheels.

 

@joonbug @831Tun I balanced it like two weeks ago and I did move the front tires to back and back to front and It didn't help at all thought the balanced was going to help but it didn't.

 

Is the shaking happening only at a certain speed range? Like 70-80? And does it do it all the time? Just trying to eliminate bed bounce.

 

@joonbug yes from 65 to 80 it shakes and is very bad.

 

Do you have a spare 35 to try swapping it in to isolate which wheel is bad? What city are you in?

 

No I don't have 35 spare I'm in San Jose CA. @joonbug

 

@Watt maker took it to the 4WP shop.

 

I would first try taking it back there and have them rebalance them. They obviously didn't do it right or maybe a wheel weight fell off.

 

18 and general grabber 35s tires are good @Watt maker and I sure will have to take it back they are not cheap. thanks

 

@joonbug thanks for your help.

 

What he said!

 

Taking your truck back to the shop sounds like the best next step.
Which General Grabber do you have? Grabber is a whole line of tires. ATX, AT2, X3, or old school Grabber (not sure they still sell those)? What pressure are you running?
I had the 35" X3 on my TRDPro and thought they were a decent tire.

 

See if it changes when you put a bunch of weight in the back of the truck. It’s very possible you just have the notorious bed bounce. Try it on an asphalt road. Also look in your mirror and see if you can see the bed bouncing up and down.

 

I don’t know where you live, but I usually check the inside of the rims for any (hidden) added weight, like caked on ice, etc. it’s more common up north.

 

I will try what you suggested thanks.

 

I'm having the same issue. It doesn't really matter what speed I am running at if I hit certain roads, or sections of roads, it does the same thing no matter what speed I am running at. Here in Colorado we have concrete roads and on some areas that are not covered in asphalt have expansion joints or cuts to allow for ground movement. It doesn't really matter. Something has to be able to be done about this.

 

If that shop can’t or won’t fix it, get it done right and take it to @Lucas7154350 in Milpitas. Solid dude.

 

For some strange reason, I can't stop staring at this...

 

Thank you.....thank you so much for this post.

 

That would be an asset in this situation.

 

She looks like she’s about 15. Just saying.

 

I agree with @joonbug ....definitely not the sheels...

 

Just wait to see what happens when you hit 88mph