Really loud grinding noise while driving! Driveshaft? - Diesel Forum - TheDieselStop.com
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6.9L Diesels Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

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Old 04-12-2009, 04:38 PM   #1 (permalink)
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Really loud grinding noise while driving! Driveshaft?

Hey all! I am new to the forum and new to diesels in general. I just got my new to me 1987 F350 6.9l xlt crewcab 4x4. The front driveshaft went bad so pulled it and replaced it. 60 miles later while I was coasting down from 35mph I heard a terrible grinding noise like when you try to shift gears without pressing the clutch in far enough. The noise went away when I dropped below 20mph.

As I limped home it started happening at even lower speeds so that if I get it up above 15mph it starts grinding really loud.

Any help would be great!
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Old 04-13-2009, 07:51 PM   #2 (permalink)
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Is your truck manual? It could be the throw out bearing in the clutch. My truck use to do that, it was the transmission mounts on mine tho. the transmission acctually moved and vibrated around. This is just my lil experiance with it tho
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Old 04-13-2009, 08:43 PM   #3 (permalink)
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Mine is auto, and the noise only starts when I am decelerating, and then will continue until I drop below a certain speed, and will get louder if I accelerate. It is a really loud awful sound, It scared the crap out of me when it first happened!
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Old 04-13-2009, 10:14 PM   #4 (permalink)
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Sounds bad...i'm not sure of anything that would cause those noises for sure, but the first step I would take is to jack the rear of the truck up and put the rear axle on jack stands, then put the transmission in neutral. Crawl/roll under it and spin the driveshaft by hand and see if you can feel anything in the rearend other than smooth even gear meshing.

Not sure of any other diagnostics for the transfer case and transmission itself, short of disassembling and looking for broken parts, sorry.
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Old 04-16-2009, 11:04 AM   #5 (permalink)
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Check to see if the fan is hitting anything. You may have a bad or loose motor mount.
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Old 04-16-2009, 03:15 PM   #6 (permalink)
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Do you have the 2 piece driveshaft...........
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Old 05-03-2009, 09:43 AM   #7 (permalink)
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turns out it was my tranfer case. The chain was super stretched out.
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1987 F350 4x4 6.9l C-6 Automatic Transmission, BW 1356 T-Case, Plantdrive Veggie Oil System in front tank, Tank heater in front tank, line heater on veggie line, Ramco Turbofyner filter system, Manual Wellman 6v glowplugs, 4" lift, Warn Locking Hubs, Tires: Chaparral a/p 315/75/16, 15w40 Oil,
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