The Ford Barn

sandbug · 12-29-2025, 11:09 PM

I have been getting this loud knocking noise for over two years now. Replacing the Weber with a Stromberg has not gotten rid of it, but it sure byppasses it faster.

Some facts:
It happens on the top of 2nd and 3rd while fully accelerating. Letting off the gas while it is happening removes the knock immediately.
The differential, rear axles, and driveshaft is recently rebuilt by Tom Endy. Bearings have been repacked.
It doesn't sound like it is in the engine (32B), and it sounds like almost the sound of pre-detonation knocking, but it is not.

Someone said watching the video that I may have a loose U-Joint or something in the drivetrain that pulls apart during the acceleration and slaps.
Ideas?
https://youtu.be/-iehc7PbtqY?si=T11z5uE5o7eQEZ2M

12-29-2025, 11:09 PM	#1
sandbug Member Join Date: Apr 2011 Location: Glendale, California Posts: 88	Knocking While Accelerating, Loose U-Joint? I have been getting this loud knocking noise for over two years now. Replacing the Weber with a Stromberg has not gotten rid of it, but it sure byppasses it faster. Some facts: It happens on the top of 2nd and 3rd while fully accelerating. Letting off the gas while it is happening removes the knock immediately. The differential, rear axles, and driveshaft is recently rebuilt by Tom Endy. Bearings have been repacked. It doesn't sound like it is in the engine (32B), and it sounds like almost the sound of pre-detonation knocking, but it is not. Someone said watching the video that I may have a loose U-Joint or something in the drivetrain that pulls apart during the acceleration and slaps. Ideas? https://youtu.be/-iehc7PbtqY?si=T11z5uE5o7eQEZ2M