Pulsing vibration

[Accelo]

We seemed to have reached the limit of what we can do over the internet without more information.
Try downloading one of the apps for you cell phone.
Mabe this one?
Audio Frequency Analyzer.
Look for one that will display the FFT analysis result.
You don't have to be able to read the FFT, I can do that.
What I am attempting to isolate is the frequency of the vibration.
Possible that would help. Or even a video from the cab at 60?
Cheers.

[lolcopter]

Rear end has been rebuilt and had new limited slip diff installed. I just replaced the axle shafts because that was the only thing reused in differential.

Originally Posted by tutone

I'm worried about dropping a bunch of money on a one piece after dropping as much as I have into the 2 piece that's on it now just to have the same vibration after. "Quote from above"

Point well taken. Borrow one. If you were closer I would let you try mine for an afternoon drive. We have a machine shop in town that will build you a nice shaft for around 350 bucks ready to slap in and go. Every truck that I have cut down gets the 3/5 static drop, new shaft and I go thru the brakes. Lucky so far, no vibrations. Also, no pinion angle shims. This leads me to believe that your problem may not be in the shaft. I would re-visit my rear end unit for premature bearing wear. Does this vibration have any whining or sound that accompanies it? One more thing, I would have a passenger ride in the bed, laying prone to see if this vibration transfers to the bed and if it is worse towards the rear or front. It will be simple when you do find it.

[tutone]

Originally Posted by lolcopter

Rear end has been rebuilt and had new limited slip diff installed. I just replaced the axle shafts because that was the only thing reused in differential.

Like I said, I would revisit the rear end if need be for PREMATURE brg wear. I read where it was rebuilt but my friend has a long term 69 camaro build with an 8.2 10 bolt (professionally built), with almost the exact same problem you have. And less than 100 miles on this rebuild.
Turns out he didnt like his gear choice either, so he pulled the rear, had another gear set installed, and the vibration issue he had been chasing disapeared.
Now I am not saying that this is your problem, but. I think we all agree someting isn't right. And from experience, just because it is new, does not always make it perfect. I hope you find your issue.

[lolcopter]

https://youtu.be/-FD2R8D5hzE

Sorry it's a ****ty video been busy lately so haven't had time to drive truck

[lolcopter]

Ordered a 1piece driveshaft today. Should be in on Thursday. We'll see if this fixes it.

[LNP]

Originally Posted by lolcopter

Ordered a 1piece driveshaft today. Should be in on Thursday. We'll see if this fixes it.

If it does let us know

[lolcopter]

Update:

Driveshaft fixed it. Truck drives glass smooth now.

[Steeveedee]

It's been a long road.

[lolcopter]

Expensive road

Originally Posted by Steeveedee

It's been a long road.

[tutone]

Good deal. Enjoy.

[HO455]

Congratulations! I've been watching your thread for awhile.