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Hey I bought my Bronco about 4 months ago and have had tons of problems. This one is the biggest so far. Issue is when I drive and get up to about 20+ mph I hear a loud grinding noise. I let of the gas sound goes away. Sounds in the front. Happens a different speeds. Truck still has good power, shifts fine and no slips. Its a automatic. When I hear it I swear it sounds like its coming from the front right. But hard to think this is a Hub causing the issue.
 

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I have the exact same issue going on now. I have a '88 302 AOD trans. I hae replaced brake calipers and pads, front u-joints (3 total) and still have the sound. I am thinking it's maybe an exhaust leak or possibly rear u-joints are dry or going bad. I plan on climbing under the truck this weekend and lubing everything up real good and also try and see if I can hear any exhaust leak.

Let me know if you find the cure. I will also report back any findings.

G/L!
 

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Jack up one side in the rear of the Bko. With the truck in park..try to turn the lifted wheel. When it hits the park stop, it'll apply pressure on the driveline, if your crush sleeve, or Pinion bearing have gone bad, the pinion yoke should move back and forth with the torsion of the gearset.(Looks like it wants to move more in and out of the rear-end, than turn sideways) That's how I found out mine was bad. And both my friend and I have had this same problem. I found it for him, so I hope this helps you rule it out , or find it. The crush sleeve was a terrible idea in the 8.8, but you can replace it witha solid spacer, as I had done with mine, and also highly recomend! :rockon
 

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Jack up one side in the rear of the Bko. With the truck in park..try to turn the lifted wheel. When it hits the park stop, it'll apply pressure on the driveline, if your crush sleeve, or Pinion bearing have gone bad, the pinion yoke should move back and forth with the torsion of the gearset.(Looks like it wants to move more in and out of the rear-end, than turn sideways) That's how I found out mine was bad. And both my friend and I have had this same problem. I found it for him, so I hope this helps you rule it out , or find it. The crush sleeve was a terrible idea in the 8.8, but you can replace it witha solid spacer, as I had done with mine, and also highly recomend! :rockon
Thanks I will check this out! When your crush sleeve was bad did you have the grinding noise?

Also do you have any pictures and details on the solid spacer you used? Any help would be great! I'm pretty new to all this.:toothless

Sorry to the original poster for hijacking. Maybe with us both working on the issue we can figure it out!:thumbup
 

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Well I don't have the cash money for cameras and what not.. All my money goes into a Bronco, a motorcycle and a couple 4 wheelers. So.. You're sol on my resources..I can tell you however that the crush sleeve WAS bad, but only because the pinion bearing went out. And pretty much allowed the torsion of the rear end to smash that crush sleeve. I only know this much because the Garage I had do the work, are differential specialists..and have been for over 25 years. It wasn't cheap, and it wasn't quick work..but 4:56's later ..I'm a happy customer. I would suggest talking to a known professional in your area. Unless you can find some info on here. I know I seen some fellas talking about these solid shim kits..that eliminate those crush sleeves. Do a search and see what you can turn up. Good luck! :rockon
 
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