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48 8n rear axle and ford mechanic

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steve

11-25-1999 04:27:27




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the fo-4 says to adjust the rear axle's so one wheel turns in the opposite direction as the other. i was talkin to the local ford man the other day and he said that it would ok if you could turn one rear wheel while having someone hold the other one as long as there is no noticeable drag.
what do you guys think?
steve




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llamas

11-25-1999 06:51:49




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 Re: 48 8n rear axle and ford mechanic in reply to steve, 11-25-1999 04:27:27  
I'd say he's not wrong, as long as everyone's idea of "not too much drag" is the same.

There is an ideal point of preload. Too much, and the two axle ends lock together, so the wheels turn together. Not enough, and the axle ends don't touch, allowing the wheels to turn opposite ways through the differential. The ideal spot is excatly at the point where the condition changes from one to the other. In practice, better one shim too loose (bearings a little loose) than one too tight (bearings overloaded).

llater,

llamas

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ZANE

11-25-1999 06:02:36




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 Re: 48 8n rear axle and ford mechanic in reply to steve, 11-25-1999 04:27:27  
I believe we are missing the point here.
The reason the you want one wheel to go one way and one to go the other is so that you will know if there is too much preload on the axle bearings. If there is too much preload on the bearings it will cause premature failure. It would be just like having a 10 ton load on the rear axle all the time instead of maybe less than 1000 lb load on the rear axle.
On the other hand having too little preload on the axle bearings will not cause any apreciable ill effects on the bearings etc.
What happens when too much preload is attained is that the axle ends come together and push on the axle bearings according to how much actual compression of the metal is taking place because of a lack of some where to go. Proper clearance is attained by way of shiming between the bearing hubs and the ends of the axle housings. The only real correct way to find the clearance between the axle ends is with a dial indicater at the end of one axle and by prying the axle wheel flange in and out and observing the movement of the axle in and out.

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