I'm hearing noises
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Postmaster
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I'm hearing noises
I have a noise some where in the drive terrain. It sounds like a u- joint squeek, but it changes with the engine Rpms when the trans shifts. If im driving down the road, and put the trans in neutral (with the wheels still turning) the noise stops. So i guess my question is what stops spinning when you put the trans in neutral, but the wheels and drive shaft are still spinning?
Lead Driver
Joined: Sep 2002
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From: Gateway to the West
Are you certain the noise is not present when the driveline is "under load"? Does it subside or go away of you just let the truck coast?
(The answer to your question is... NOTHING. Assuming we are talking an automatic trans., the only change is internal to the transmission). However with no drive from the engine the driveline is not under load and relieving that load may be the reason the noise subsides. Hence, the reason for my question above.
(The answer to your question is... NOTHING. Assuming we are talking an automatic trans., the only change is internal to the transmission). However with no drive from the engine the driveline is not under load and relieving that load may be the reason the noise subsides. Hence, the reason for my question above.
Lead Driver
Joined: Sep 2002
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From: Gateway to the West
I'd try lubrication on the typical problem spots, slip shaft, u-joint spiders and give the double cardon u-joint at the front of the rear driveshaft a good wiggle. If it DOES, you have a problem right there. It should be tight enough that moving with your If there is nothing obvious and the problem still exists you may have a bearing going out that has started to "whine" about it. Pinion bearings and axle bearings are suspect if you have oil leaking fro any of those locations as well.
Fleet Mechanic
Joined: Mar 2005
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From: St Louis
I am with greystreak on the lubrication but my guess would be the rear ujoint is dry or getting dry. The next bad point is the centering ball in the double cardan which you cant lube with out dissassembly of the entire joint.
Lead Driver
Joined: Sep 2002
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From: Gateway to the West
Wow, just realize I missed the second half of a sentence in my last post here...
Sentence reads "It should be tight enough that moving with your..." then runs into another sentence. Sorry guys. I meant to say you shouldn't be able to wiggle the double cardon joint by hand and if you can, there is the problem.
Sentence reads "It should be tight enough that moving with your..." then runs into another sentence. Sorry guys. I meant to say you shouldn't be able to wiggle the double cardon joint by hand and if you can, there is the problem.
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I was looking around, I found that the U bols on the rear leaf springs were loose. I tightend then, and now the squecking I was hereing only happens when the brakes are applied. Now I hear another noise though. If I down shift to "engine brake", I hear a mettalic sound. SOunds like gear grinding, or the chain in the T-case jumping or something like that.
Fleet Mechanic
Joined: Mar 2005
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From: St Louis
How loose is your exhaust system? I remember some old beat to death flat on one side 17 in glass-packs on a 79 t-bird I had that would rattle like crazy when I would drop the old FMX into a lower gear, stupid teenage days.
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well, Im pertty sure I figured out where my noise is comeing from. Im about 95% sure its the pinion bearing. The local tech school is diesel program, and they are interested in rebuiling the axle/ and a gear in the rear and front.
Posting Guru
Joined: Apr 2006
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To rule out the chain, tye rap the front driveshaft to the radius arm. It the tye rap doesnt break, then your chain is not turning. On the pinion, put the truck in newtral and crawl under. (wheel chalk) twist the drive shaft back and forth. If the pinion is going in and out, the nut is loose. (common problem) But my first guess is the carden. They go out alot.