Annoying Rear End Vibe

[454c20]

Well I narrowed down my vibration at speeds over 55+. It seems to be coming from the back of the truck somewhere as I can duplicate it on jackstands.

So far, I have swapped the rear rims/tires, had a entirely new driveshaft made and balanced (old one was bent), and I just pulled the rear apart to check it over. All the bearings look fine. It seemed both axle shafts had some excessive runnout so I replaced those as well. I'd have to say after all that there is little to no change in th vibration.

What else can it be? The only things I havent physically touched is the actual rear end housing and tailshaft bushing in the transfer case.

Any thoughts? I'm getting tired of putting money into it w/o any changes.

[va_tlc]

well i had same thing, i rebuilt transmission, then like you a brand new driveshaft made and new slip yoke, still noisy, so took rear end cover off and jacked wheels up and found about 3 teeth off .. not a good start on this truck.
so orederd a new ring gear and pinon, also changed pinion yoke i guess ya call it, the one on ya rearend that holds the driveshaft. you may wanna check that mine was spread and the lil metal tabs that holds the u joint in place was wore about off. hope you have better luck than i did.

[454c20]

The gears looked fine, although the backlash was a little looser then I like to see it. It was between 0.012 and 0.013, while spec is 0.006-.0010.

Anyone in the MA area have a cheap 10 bolt for sale?

[va_tlc]

careful, you have to be a paid member to post a want to buy, and trust me it will be the best 25 bucks youll spend, youll also be able to sell things,hum back to your problem did ya check u joint too? do you have a lift kit in this truck? good luck