Engine "rattle" at speed...
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Laughing Gas
Joined: Dec 2014
Posts: 774
Likes: 10
From: Simsbury, Connecticut
See now this my good people is why the FTE is such an amazing source of info. Good people. Good intel.
Thank you so very much for your time to write all that. I learned a lot and I'm sure others did too. I'll start poking around to see what I can find.
Thank you so very much for your time to write all that. I learned a lot and I'm sure others did too. I'll start poking around to see what I can find.
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Laughing Gas
Joined: Dec 2014
Posts: 774
Likes: 10
From: Simsbury, Connecticut
No PTO. I wish I did! 
At lunch I got the engine warmed up to 170. Oil pressure at 40 PSI. I slowly accelerated to 1000 RPMs (to the count of 5). Then let off the accelerator quickly. No rattle. I did it again but this time let off slowly. No rattle. I did the same at 1500 RPMs, 2000, 2500, 3000, 3500 and 4000. I never get above 4K RPMs so no need to go further since the sound, when in motion, occurs below this.
So I crawled under the truck and gave the drivetrain a wiggle. The U-Joint at the rear axle is solid. But up at the front of that same section it does this:
At lunch I got the engine warmed up to 170. Oil pressure at 40 PSI. I slowly accelerated to 1000 RPMs (to the count of 5). Then let off the accelerator quickly. No rattle. I did it again but this time let off slowly. No rattle. I did the same at 1500 RPMs, 2000, 2500, 3000, 3500 and 4000. I never get above 4K RPMs so no need to go further since the sound, when in motion, occurs below this.
So I crawled under the truck and gave the drivetrain a wiggle. The U-Joint at the rear axle is solid. But up at the front of that same section it does this:
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Thread Starter
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Laughing Gas
Joined: Dec 2014
Posts: 774
Likes: 10
From: Simsbury, Connecticut
The center driveshaft bearing appears rock solid. I can't wiggle the front driveshaft from the transmission to the center bearing at all. The only play I have is the front of the rear driveshaft where it meets that center bearing. That's what's in the video.
Logistics Pro
Joined: Sep 2014
Posts: 4,920
Likes: 21
From: Bothell & Silverdale, WA
Ok, yep, that "rattle" you hear is those needle bearings rotating around the brinelling they've made in the cross that's been out of lubricant for awhile. Common issue on high mileage "permanently lubricated" universal joints. This could also be a latent issue from a previous owner(s).
Thread Starter
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Laughing Gas
Joined: Dec 2014
Posts: 774
Likes: 10
From: Simsbury, Connecticut
Ok, yep, that "rattle" you hear is those needle bearings rotating around the brinelling they've made in the cross that's been out of lubricant for awhile. Common issue on high mileage "permanently lubricated" universal joints. This could also be a latent issue from a previous owner(s).
Logistics Pro
Joined: Jul 2016
Posts: 3,646
Likes: 816
From: Swan River Valley M.B Can
It is human nature if not hot rodder nature to assume the worst but as I have been a mechanic for most of my life ( and I still do the same ) some times its not as bad as we think hope this is your problem
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turboguy
1987 - 1996 F150 & Larger F-Series Trucks
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Oct 21, 2005 04:54 PM