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Classic Truck Discussion Forum

Ford Ln700 tires

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Dairy Feeder

11-01-2016 20:26:47




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I recently bought a 1980 Ford LN700 with a 20ft livestock box on it. It had very good bias ply tires on the rear and I put new radials on the front. Empty the truck is great, I hauled 1 load of cows and when it was loaded it went all over the road! Is that caused from mixing bias ply and radial tires?




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hd6gtom

02-14-2017 20:31:07




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 Re: Ford Ln700 tires in reply to Dairy Feeder, 11-01-2016 20:26:47  
What kind of tires do you have on the rear? If they have a very very aggressive tread on them it can cause this problem. Speaking from experience here. In the 22+ years I owned a tire shop, I saw lots of straight trucks with radial on the front and bias on the rear with no drivability problems. As stated, jack up the front end one side at a time and check for loose parts.



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Destroked 450

11-04-2016 08:55:33




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 Re: Ford Ln700 tires in reply to Dairy Feeder, 11-01-2016 20:26:47  
Quoting Removed, click Modern View to see

The part about working, owning and driving was supposed to be at the bottom, not in the middle.

This forum needs to have one way to view and make it where one can edit mistakes.



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Destroked 450

11-04-2016 08:46:39




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 Re: Ford Ln700 tires in reply to Dairy Feeder, 11-01-2016 20:26:47  
I have had some tires that made a truck pull from one side to another on rough patchy roads, but most times there's a issue with the steering.

How much free travel is in the steering wheel, it should have less than a quarter turn, 1/8 turn is better but it does need some free travel. Check the free travel in the shaft next to the steering box as there's a couple of ujoints in the steering shaft between the steering box and steering wheel that can give a false reading.

If the steering wheel has to much free travel check these.

tie rod ends

drag link

Steering box adjustment

I've worked on, owned and driven several Ford L series trucks and have replaced more worn drag links than any other part on the steering.
ujoints in steering shaft

slop in telescoping shaft

If steering is tight check these

king pins, jack up the front axle then pry up on the tire to check for movement

alignment, should be toed in 1/8 inch

wheel bearing tightness

spring eye bushings and pins

spring shackles and pins

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Nordic

11-03-2016 21:41:18




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 Re: Ford Ln700 tires in reply to Dairy Feeder, 11-01-2016 20:26:47  
Are all the tires inflated to the same and proper pressure? If they are...the going all over the road should not be from having radials on the front. You didn't happen to have rambunctious cows in the load? LOL. I guess if you have done cattle hauling a lot you know what to expect.



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