Hey fellas, got the new truck driving but got some issues, the truck rides smooth and brakes well, but i noticed that at 60-75ish mph i get vibrations in the floor and pedal... i never ever had any vibrations on my 90 ctd...... im using the same driveshaft, motor, trans and just had the tires balanced....... the vibration seems slightly worse if i let off the throttle at those speeds to... but once im down to 55mph... no vibrations, any ideas? should i have the tires rebalanced? It doesnt seem to be any rpm issue.. cause i can rap the motor to 3500rpms at 45mph and its smooth.... only at those speeds.... and possibly higher, but i aint gone that fast in it yet... does it vibrate like this.. thanks

P.S. ill try to get more pics of the new truck on here this weekend

jason

 

Mine does the same **** thing.. All new front end parts, bearings etc are ok..

Im convinced its the tires.. I have BFG AT's, apparently they are notorious for not balancing well.

 

Really.... thats so wired cause those are the tires i got! hahaha i gto 35s that are 12.5 wide on a 16.5 rim and they are brand spanking new! the wierd thing is they only put two small weights on the inside of the tire, but none on the outside.... i think im gonna takem back and have them checked again.


jason

 

Ive got a bit of shimmy and floorboard vibrations with the same tire.............rotating them will help but Im starting to wonder if the floorboard vibration is a carrier bearing.

 

Make sure they give you a road force number on the tires. You can balance tires all day long and show good, but it may have to much road force, which will always shake the heck out of a truck.
Good luck
Justin

 

Whats road force? and how do i ask? D o i just go "hey tire guy, what road force is on this tire?" and will that make a difference in vibrations? thanks

jason

 

In simple terms it's like a hard spot or over weighted part of the tire or wheel. And any good shop will always check that while balancing the tires. Most all of the time road force is the problem, not the weights coming off.
And Yes just ask, all new tire machines will do road force when they are in the prosess of balancing the tire, it takes maybe 20 seconds extra, If one is high then they can try and wheel match the tire to the wheel, this is when you mesure the run out of the wheel and put the low spot of the wheel to the high spot of the tire.
And what I call a wheel most call a rim, but I just wont use that term, wheels go on trucks, rims go on bikes!
Any of that make sence?
Justin

 

Yup, makes sense, thanks ill be making a trip over to the tire guys tomarrow to see if they can fix this vibratoin

jason