You needed to record the backlash setting BEFORE taking it apart.

You also need to pay attention to the preload on the carrier bearings as well.

If you haven't pulled the 3rd member yet I would guess the preload is loose and the carrier bearings are slapping around.

While setting up a Ford 9 inch is great for a "beginner" it's still considered an advanced ability compared to the average garage mechanic.

Josh

 

They "say" not to run the wheels off the ground for safety, not because the axle housing is like a wet noodle. Just how soft and weak do you think axles are? If the axle housing droops down, then the housing would also "bend" from the weight of the truck.

Josh

 

c'mon this isn't a laughing matter...

 

i am just used to shimming an axle. ive only set up 8.8s. all with used gears and never had a problem, got about 10,000 on the one in my truck and no noise. if the preload was loose enough to cause it to move around wouldn't it be a steady noise? oh well ill find ot tommorow one way or the other. when turning the adjuster nuts how tight should the main cap bolt be? just snug or tighten them down to spec?

 

Good-n-Snug. As tight as you can get 'em & still turn the adjusters.

 

Agreed,

Pulsing sound, When setting up back lash all the books say to check it in 3 or 4 equals spots aroung the ring gear. I have seen them tight and loose in different positions. I assume the rings gear was removed inorder to remove the spider gear pin? I know some are that way.
If the ring gear had debris under it and it did not seat evenly on the carrier this could cause a pulsating sould.
Also like Bullitt390 said above if there is insuffecent preload on the carrier bearings the ring gear carrier assembly would be wobbling around in there and the carrier bearings will not last long.

All Rear ends have 4 adjustments
Pinion Hieght
Pinion bearing preload
Differential carrier bearing preload
Gear Back Lash

As long as the pinion was untouched then it's OK
That only leave the ladder two

Like Bullitt390 said above the 9" is the easiest of all

- Get your hands on a dail indicator
- Make sure the ring gear is seated well (clean and tight)
- Make sure the opposing carrier bearing adjusters are tight against the bearings. Rotate the carrier while you tighten.
- Make sue the back lash is close at different points around the gear.

Remember too tight a backlash can make more noise than loose.

BTW Love the wet noodle axle theory

 

well the dirt or something being under the ring gear sounds more possible in my mind. i dont know how something could have got there as i cleaned all the parts bfore i started bolting it together but we'll see, thanks for all the info guys

 

You got all three roll pins installed?

This picture shows 2 of the 3 installed in a 4 pinion 28 spline carrier.



Josh

 

well who ever says 9 inches are the easiest to rebuild i dont agree with. the prblem was preload like bullit390 suggested. i am used to shims, and it is easy to tell the preload with shims. since the main caps hold the bearing races with some pressure as i was adjusting it i somehow ended up geting it all set up and it felt right but the one race furthest from the ring gear wasn't touching the adjuster nut. opps. got it all figured out now, basically i just got the backlash right then bottomed the other adjuster nut out till the preload was way to tight to make sure all the races were against their nuts and just acke it off litlle by little till the preload was right and threw it back in the truck. runs great now. just annoyed that i had to do it three times lol. oh well you learn by screwing up i guess. thanks for all the help

 

the origanal carrier had one pin and two spiders, the "new" one has the three pins in it. but yeah i got them all in

 

Good work! I was a bit skeptical at first. I just hope you finished it up before trick-or-treat time came! LOL

 

its not that i dont know how to do axles, i just always done 8.8's that had shims, but i know now lol. and next time im gonna make sure it has the right spiders before i put it in lol