Funny Noises - Diesel Truck Forum -
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post #1 of 2 (permalink) Old 03-20-2014, 01:33 AM Thread Starter
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Funny Noises

Hey everyone,
My truck keeps making a pretty hard grinding noise from under the floor boards lately, it only happens when i let off the throttle and the truck holds the gear and brings the rpms down, it grinds for a second then stops. Im also getting a pretty bad grinding from the four wheel drive whenever the t case is engaged, doesnt do it if just the hubs are locked. The owner before me had just put the front driveshaft in before he sold it to me, but it didnt make the grinding until after about a month of driving it...any ideas!? Could the driveshaft be the cause of both noises?
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post #2 of 2 (permalink) Old 03-20-2014, 07:56 PM
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Check the oil levels and the motor and transmission mounts, be sure everything is tight, transmission to engine and transfer case to engine. Be sure the front drive shaft is not bottomed out. If it is too long it will make all kinds of weird and wonderful sounds. It might be an idea to drain the transfer case and front diff, looking for abnormal metal.
Just a thought!

1988 ford van fresh overhaul, 1991 nissan pick-up 1993 Caprice 2000 GMC S10 Blaser 2007 nbs 3500 GMC 4x4 crew-cab long box 17 inch single wheels Duramax Alison. BW turnover Ball. Furakawa FL35 loader. Retired, HD mechanic, worked on engines all my life. Fabricator welder. electrician. in the process of finishing my new shop. Live in Rock Creek B.C. Wife has a fruit stand.
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