3 speed manual transmission noise

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3 speed manual transmission noise #831632 08/20/07 02:16 AM

Joined: Aug 2007

Posts: 13

dave123

Need a Spot

I have just bought a 1977 jeep with a 3 speed. I hear a rattling noise, but only under the following circumstances: The clutch is depressed while the vehicle is in gear and coasting. Any other time, there is no funny noise. No noise while accelerating, decelerating, or in neutral, or with the clutch out. No noise when the vehicle is not moving.
Any advice would be most appreciated.

Thanx,
Dave

Re: 3 speed manual transmission noise [Re: dave123] #831633 09/04/07 07:25 PM

Joined: Aug 2007

Posts: 13

dave123

Need a Spot

New info. No noise in 4wd neutral regardless of clutch position. I get noise while coasting, clutch in in all gears. Ya think it is the transfer case?

Re: 3 speed manual transmission noise [Re: dave123] #831634 09/04/07 09:39 PM

Joined: Oct 2003

Posts: 7,768

Central Texas

BigJim

Web Wheeler

About 99% of noises come from either the u-joints or the throw out bearing at the clutch. Seems you have ruled out the throwout bearing.. So now you MUST eleminate the u-joints before even considering the tranny or transfer case.
Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />

professional bovine relocation specialist

Re: 3 speed manual transmission noise [Re: BigJim] #831635 09/04/07 09:46 PM

Joined: Aug 2007

Posts: 13

dave123

Need a Spot

I don't think is is the u joints for the following reasons: 1. I removed the front driveshaft no change.
2. the rear u-joints and drive shaft seem solid, no movement with the exception of some wiggle in the yoke that joins the transfer case to the rear driveshaft. the wiggle is forward of the u-joint.
3. the noise goes away when i put the jeep in neutral with clutch in, but i have it in gear with the clutch in. the u-joints would not be changed by this fact.
what do you think?
thanx

Re: 3 speed manual transmission noise [Re: dave123] #831636 09/04/07 10:37 PM

Joined: Oct 2003

Posts: 7,768

Central Texas

BigJim

Web Wheeler

I think that is bout as far as anyone not at the scene can go with advice.. Someone that is there listening and feeling will have to diagnose your noise.
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />

professional bovine relocation specialist

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