Driveline noise
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Cargo Master
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Driveline noise
Guys got the 52 F1 out today to fill her up with gas. Really quiet and smooth ride considering the age of the truck. Plenty of good power, I can keep up with traffic very well.
One thing we are noticing is a chatter, almost sounds like something rubbing when under a load in 2nd or 3rd. Good example would be start from red light on flat ground. Sounds fine in 1st, sounds fine in second, rpms are high about to shift to third and then you come up a red light. So let off and start slowing, light turns green, so you hit gas, still in second, engine is trying to get caught up, that’s when you can hear it, if I shift to third without getting caught up in second noise is still there. It’s like a bearing noise either in the transmission or rear end. Once you get back on top and the truck is moving pretty good you don’t hear it.
It’s got 3.54 gears in it, and I wonder if it’s just an outcome of the taller gears, or if it’s a bearing issue in the transmission or a rear end issue.
JB
One thing we are noticing is a chatter, almost sounds like something rubbing when under a load in 2nd or 3rd. Good example would be start from red light on flat ground. Sounds fine in 1st, sounds fine in second, rpms are high about to shift to third and then you come up a red light. So let off and start slowing, light turns green, so you hit gas, still in second, engine is trying to get caught up, that’s when you can hear it, if I shift to third without getting caught up in second noise is still there. It’s like a bearing noise either in the transmission or rear end. Once you get back on top and the truck is moving pretty good you don’t hear it.
It’s got 3.54 gears in it, and I wonder if it’s just an outcome of the taller gears, or if it’s a bearing issue in the transmission or a rear end issue.
JB
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Cargo Master
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JB
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From: Foothills of NC
The difference would be in how the spring pedestals are mounted in relation to the angle of the yoke.
If the yoke on the transmission is pointing down 3 deg, the yoke on the rear end should be pointing up toward the transmission appx 2 1/2 degrees. This lesser amount up from the rear allows for axle wrap.
If the yoke on the transmission is pointing down 3 deg, the yoke on the rear end should be pointing up toward the transmission appx 2 1/2 degrees. This lesser amount up from the rear allows for axle wrap.
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Cargo Master
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the sound is similar to when driving an automatic, and the trans is lugging but doesn’t shift down, just a little louder. In an automatic you can kick it down by hitting the gas, it’s that sound, the lugging part.
will record it tomorrow and report back
JB
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I don't understand the noise description, is it a low pitch growl, more if a whine of howl, a severe vibration? Drive line angle issues usually cause vibrations. I haven't heard of one causing any noise issues without a vibration associated with it. Is it a one piece or two piece drive shaft assembly (that's how little I know about the 52 and older trucks)? On two piece drive shaft assemblies, a bad center support will cause chattering, vibrations, etc. when under a load.
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Cargo Master
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I don't understand the noise description, is it a low pitch growl, more if a whine of howl, a severe vibration? Drive line angle issues usually cause vibrations. I haven't heard of one causing any noise issues without a vibration associated with it. Is it a one piece or two piece drive shaft assembly (that's how little I know about the 52 and older trucks)? On two piece drive shaft assemblies, a bad center support will cause chattering, vibrations, etc. when under a load.
when I set that d41 up, I was learning, and not sure I had the preloads right on the pinion. The pinion bearings have always been suspect as that was my first one to setup.
it’s a one piece driveshaft, balanced, with new u-joints.
JB
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From: Foothills of NC
What you describe sounds more like what I would call gear rumble. New gears and old gears meshing together, even used from different transmissions, will have a whine, moan, or rumble, when under load.
My NP-435 will have a rumble when lugging it down in 3rd and 4th. Many times it's just part of a manual transmission. Especially trucks from back in the day when motor mounts and transmission mounts didn't absorb noise and vibration like today's mounts do.
My NP-435 will have a rumble when lugging it down in 3rd and 4th. Many times it's just part of a manual transmission. Especially trucks from back in the day when motor mounts and transmission mounts didn't absorb noise and vibration like today's mounts do.
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Cargo Master
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What you describe sounds more like what I would call gear rumble. New gears and old gears meshing together, even used from different transmissions, will have a whine, moan, or rumble, when under load.
My NP-435 will have a rumble when lugging it down in 3rd and 4th. Many times it's just part of a manual transmission. Especially trucks from back in the day when motor mounts and transmission mounts didn't absorb noise and vibration like today's mounts do.
My NP-435 will have a rumble when lugging it down in 3rd and 4th. Many times it's just part of a manual transmission. Especially trucks from back in the day when motor mounts and transmission mounts didn't absorb noise and vibration like today's mounts do.
JB
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No vibration, it almost sounds like a bad bearing, but if I had a bad bearing I think I would hear it all the time and not just when the engine is under load in high gear.
when I set that d41 up, I was learning, and not sure I had the preloads right on the pinion. The pinion bearings have always been suspect as that was my first one to setup.
it’s a one piece driveshaft, balanced, with new u-joints.
JB
when I set that d41 up, I was learning, and not sure I had the preloads right on the pinion. The pinion bearings have always been suspect as that was my first one to setup.
it’s a one piece driveshaft, balanced, with new u-joints.
JB
If you suspect it's a bearing or something inside the trans and are not ready to pull it apart, I'd try adding some Lucus Oil Stabilizer, Heavy Duty Oil Stabilizer (lucasoil.com) It might help quite things down a bit until you are ready for another project. Their gear oils are great as well, but they are GL-5 rated which is not good for transmissions with brass synchronizers.
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Cargo Master
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Timing is dead on, engine runs like a top. One thing I need to check is the speedo cable. It’s a NOS cable and we just installed it with no lube. It may need some lube. It could be carrying noise, and I think it is touching the trans cover as it comes out of the transmission.
JB
JB
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