Spring Ride Suspension Question????
I have a 1985 FLC Daycab with Spring Ride Suspension. I am hoping to find some people who drove these and had a problem such as I have.
When I am loaded, there is not a smother riding truck I have ever been in, but when I am empty I get a up and down vibration, (it is like riding a horse real fast, up and down, not side to side), at 2 different speeds 35 to 40 and 65 to 70.
It only does this when it is empty, with or without the trailer.
So far to date I have had or done the following:
New steer tires put on.
New drive tires.
All tires and wheels balanced. I even had them jack the drive axles up and watched the tires spin and noticed no up or down movement, or vibration.
It is not in the transmission as it will do it even if you take it out of gear when it starts, and you cannot fill it in the gearshift.
I took it to a Alignment shop to have the 3 axle alignment done, as I thought this could be the problem, but the Tech told me that if one of the axles were out of alignment, it would not cause it to hop up and down, and that he had never heard of one doing this.
When I spoke to the previous owner, he told me that he could never get that out. (Wish he would have told me that prior to purchase)
He then told me that he had to buy 3 sets of steer tires in 5 years, and there did not have many miles on them. This is a logging Truck and Trailer, not more than 60,000 to 70,000 per year.
When I had the steer tires checked after I bought it, they had less than 30,000 miles on them. Heck they looked like they had 5,000 to 6,000 on them.
They put a machine with a wheel on it on each steer tire, and both of them, were only hitting half of the tire they were dancing from side to side.
Sorry for the long post, but I have spent over $5000.00 to try and find the problem, and no help yet.
Any suggestions would be greatly appreciated.
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