Loud tranny noise... I think???

[zhicks2585]

Ok so my 07 lbz has been makin a loud hummin noise, I'm not positive its the transmissions but the noise gets louder as I shift gears an then it cuts out when I go in 5th an 6th. I've checked for codes an there aren't any. I have changed the transmission fluid since bought it used 30,000 miles ago. It has 132000 now. It seems to always make the noise after the transmission gets over 180. I don't know what to do.

 

[IOWA LLY]

What about in tow/haul? Does it still make the noise in 1st through 4th?

 

[Mike L.]

Ok so my 07 lbz has been makin a loud hummin noise, I'm not positive its the transmissions but the noise gets louder as I shift gears an then it cuts out when I go in 5th an 6th. I've checked for codes an there aren't any. I have changed the transmission fluid since bought it used 30,000 miles ago. It has 132000 now. It seems to always make the noise after the transmission gets over 180. I don't know what to do.

What kind of truck do you have and what year?

 

[IOWA LLY]

What kind of truck do you have and what year?

Ok so my 07 lbz has been makin a loud hummin noise, I'm not positive its the transmissions but the noise gets louder as I shift gears an then it cuts out when I go in 5th an 6th. I've checked for codes an there aren't any. I have changed the transmission fluid since bought it used 30,000 miles ago. It has 132000 now. It seems to always make the noise after the transmission gets over 180. I don't know what to do.

 

[Mike L.]

lcoot:

 

[zhicks2585]

yes it still does it in tow-haul.. and its a 2007 3500 dually, lbz with banks six-gun tuner, banks ram-air air intake, and 4" exhaust. It may not even be the transmission, i think it may be my thermostat i'm going to replace it this weekend to see if it stops.

 

[Bustedknuckles]

Dude its your fan running, what's the engine temp when it happens?

 

[zhicks2585]

anywhere from 190-210... i thought it might be the fan but its so loud i figured it wasn't, is it supposed to be that loud? Wouldn't it still make the nosie while its sitting idle? this is my first turbo diesel i had a 90' 7.3 idi before this. I'm going to feel pretty dang stupid if its suppose to be that loud

 

[Bustedknuckles]

anywhere from 190-210... i thought it might be the fan but its so loud i figured it wasn't, is it supposed to be that loud? Wouldn't it still make the nosie while its sitting idle? this is my first turbo diesel i had a 90' 7.3 idi before this. I'm going to feel pretty dang stupid if its suppose to be that loud

Id say its your fan, theyre ridiculously loud when the fan clutch engages. And no, it shouldn't do it at idle.