Manual Transmission Noise - JeepForum.com
 
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post #1 of 6 Old 12-03-2016, 10:30 PM Thread Starter
Johnwazup
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Xj Manual Transmission Noise

This noise happens in all gears except 4th which is totally quiet. Transmission shifts fine and takes power like a champ. The noise is proportional to amount of throttle inputted. It's more of a whirring noise or maybe a slight whine. It basically sounds like a supercharger. Car has 115k miles on it. 01 Jeep Cherokee with NV3500 transmission. Any thoughts?


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post #2 of 6 Old 12-04-2016, 01:38 PM Thread Starter
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Bump + if I disengage the clutch while driving, the noise goes away

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post #3 of 6 Old 12-04-2016, 02:00 PM
CJ7-Tim
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The NV3550 is known to be noisy. Normal noises include an audible whine at extreme speeds. Other noises are usually due to lubricant issues. Hard shifting, noise, wear, and internal binding are usually caused by lubricant issues — dirty gear oil, low levels, or the wrong lubricant.

Using GM Synchromesh fluid will likely reduce the noise and improve the shifting.

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post #4 of 6 Old 12-04-2016, 03:44 PM
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Nv3550 owner here. Synchromesh helped quiet things down and made the shifts seem smoother.

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post #5 of 6 Old 12-11-2016, 09:54 PM Thread Starter
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Update

The noise is almost light straight cut gears, I would think it's a input bearing but here's the catch. The noise only occurs when any throttle is inputted into the transmission. If I am engine braking with no throttle, the whine will go away and will only resume when I press the gas pedal down. My guess is that the transmission is noisy and I just have to deal with it.

On a related note, I've been researching for new fluid for the tranny that may alleviate these noises, I've narrowed it down to Royal Purple Synchromax, Pensoil Synchromesh, and Redline MTF. Money is not a concern for picking the correct fluid, just whatever fluid that will let the tranny last and (hopefully) make less of a racket.

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post #6 of 6 Old 12-12-2016, 05:13 PM Thread Starter
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I chose to believe this is normal until the tranny explodes, when it does, I finally have an excuse for a 4x4 conversion .

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