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C6 weird noise

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Old 10-29-2018, 09:51 PM
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C6 weird noise
Hi guys,
I just bought an 89 f350 with a 460 and It has the c6 transmission. When the truck is cold, everything is fine. When the truck warms up, the transmission will occasionally get real loud. When it starts to make this noise, the rpms do not change. The sound is not a whining or clunking sound, it sounds like When you turn the overdrive off. Any ideas what could be causing this? Thanks in advance for the help!
 
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  #2  
Old 10-29-2018, 10:18 PM
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What sound does a transmission make when you turn the OD off? They shouldn't make any sounds, the only sound should be the engine running a higher rpm. Are you sure it's not your clutch fan kicking on and off?
 
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Old 10-29-2018, 10:42 PM
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The sound I mean is like it’s running at higher rpms, but it’s not, the rpms don’t change. Does fan clutch sound come in cycles?
 
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Old 10-29-2018, 10:44 PM
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Originally Posted by ford390gashog
What sound does a transmission make when you turn the OD off? They shouldn't make any sounds, the only sound should be the engine running a higher rpm. Are you sure it's not your clutch fan kicking on and off?
I'd have to agree with this...
 
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Old 10-29-2018, 10:46 PM
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Originally Posted by Ncinic
The sound I mean is like it’s running at higher rpms, but it’s not, the rpms don’t change. Does fan clutch sound come in cycles?
The one word answer to this question is : YES!
 
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Old 10-29-2018, 10:49 PM
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Thanks guys...I had no idea that it would be that loud. Thanks for the help and responding so quickly .
 
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Old 10-29-2018, 10:53 PM
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On a hot day with a pretty good load with the A/C on my 97 sounds like a C130 taking off when I am leaving a stoplight!!!
 
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Old 10-30-2018, 05:03 PM
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I would check your transmission fluid for a burning smell and if that's okay then it's probably like the other posters said just naturally loud. Mine's pretty loud at highway speed.
 
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