Clunk CLunk

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Nov 28, 2001 | 11:59 AM

albertaguy

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Joined: Sep 2001

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Clunk CLunk

Hello:

I am driving a stock 1986 Ford Brono with a 5.0 Liter engine.
Everyone once and a while when i put it into gear and drive away i hear terrible clunking coming from underneath. In the cab it feels like the whole bottom is going to fall from the truck.
Any ideas on what it could be ??

Ward

Nov 28, 2001 | 02:35 PM

Mil1ion

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Joined: Jan 2008

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Clunk CLunk

Ford trucks have a problem with driveshafts clunking.
They just do it.

I stopped mine by putting a moderate amount of high temp wheel bearing grease on the driveshaft spline and shoving it back on.
It works.

Dennis

78 F-150 429CJ C6 ,Silver w/Explorer Pkge
641/2 Mustang,Pre-World's Fair Car #8092
64 Fairlane S/C waiting for a 390-4spd.
68-Mustang.Sunlit Gold 80,000 miles

Nov 28, 2001 | 07:45 PM

JBronco

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Joined: Jun 2001

Posts: 2,809

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From: Loveland, CO.

Clunk CLunk

Mine was clunking and vibrating. One of the cv joints (they are cv joints, not u-joints. It's a constant velocity shaft) was sticking, and you can't tell without taking the shaft off and rotating the joints around. You will feel a spot where it is sticking if it is bad. I had the shaft rebuilt and balanced, cost $350 but the truck drives 1,000 percent better. If you are sure your cv joints are good then greasing that center spline seems to be working for most folks. I'm not sure what the consensus was about how to remove the boot and put it back on, the the best idea I saw was to simply slide it up with the factory clamp on, and then slide it back down after you grease it. Apparently the clamp is not so tight that you can't move it. Someone said this worked for them.

Nov 29, 2001 | 10:44 AM

adelyser

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Clunk CLunk

Here is the easiest way to lube the drive axle slip-joint:

I had a similar problem on my '94 EB, and the problem was occuring in the slip-joints on the driveshafts. The joints would stick, and under enough force, would compress and make the clunk noise, which was quite loud. I went to the local feed store and bought a large syringe and a big needle. I then jacked up the back by the frame, filled the syringe with grease from my grease gun, and inserted the needle into the rubber boot around the slip-joint. After applying the grease, I did the same for the front drive shaft, and the problem went away after a couple of miles. I think the total cost was about $5.

Aaron D.

Nov 29, 2001 | 11:12 AM

honney

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Joined: Jul 2001

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Clunk CLunk

Your '94 still has a slip-shaft in the d/s itself and not at the t-case? Also, it's recommended to use a high-pressure grease on the slip shafts (most moly lubes say they're rated for high pressure).

Nov 29, 2001 | 11:41 AM

adelyser

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Clunk CLunk

Yeah, I have a slip-shaft in both the front and rear driveshafts. The rear driveshaft bolts to the flange on the transfer case, and there is a CV joint on the driveshaft side of the assembly.