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02-02-2006, 11:59 AM
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#1 |
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Registered User
 
Join Date: Nov 2000
Location: chimayo, nm, usa
Posts: 898
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High pitch noise??
I have had a high pitch noise coming from my truck for a while, of course I hardly ever drive it, but when I do, I get reminded. It comes from the front of the transmission, and varies with speed. At certain speeds it's almost not there. If I throw it into neutral, it stops. Doesn't seem to be engine related. I have a small block with a TH400 Tranny. Thanks..........
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02-02-2006, 12:17 PM
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#2 |
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Registered User
Join Date: Feb 2005
Location: Carl Junction, Missouri
Posts: 2,061
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Re: High pitch noise??
loud fan? i was going to say bad weatherstripping, but that's not drivetrain related.
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02-02-2006, 12:43 PM
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#3 |
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SKINNY TIRES RULE!
Join Date: Sep 2001
Location: Bothell, WA
Posts: 11,049
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Re: High pitch noise??
U-joints?
__________________
bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L |
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02-02-2006, 01:12 PM
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#4 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: High pitch noise??
Does it chainge pitch with speed... with RPM...do away when you stop...
it could be anything right now, need more info. |
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02-02-2006, 01:26 PM
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#5 |
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Registered User
Join Date: Nov 2000
Location: chimayo, nm, usa
Posts: 898
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Re: High pitch noise??
It changes pitch with speed. I suppose it could be u-joints, although they are about 10 years old, with about 5k miles.
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02-02-2006, 07:28 PM
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#6 |
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No,I DON'T have Tourett's
Join Date: Mar 2005
Location: Reno, NV
Posts: 556
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Re: High pitch noise??
I would have suspected speedo cable, but if it disappears when coasting, squelch that idea.
__________________
'72 K5 CST 350/350 Daily Driver '69 GMC3500 Camper Special CST Flatbed 396/400 Upgraded to show truck '69 GMC 2500 L6292, 3spd beater |
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02-02-2006, 07:47 PM
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#7 |
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Registered User
Join Date: May 2003
Location: Shreveport LA
Posts: 3,170
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Re: High pitch noise??
I've heard a couple of T-400's that had kind of a whiny turbine sound, but they worked fine for years and years. It's similar to a Powerglide in low gear, or a turbocharger spooling up.
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02-02-2006, 08:08 PM
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#8 |
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Senior Member
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,237
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Re: High pitch noise??
torque converter?
__________________
David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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02-02-2006, 09:23 PM
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#9 |
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Senior Member
Join Date: Mar 2003
Location: St robert Mo
Posts: 2,001
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Re: High pitch noise??
My th400 sounds like that untill it warms up about 1 minute or so I think it is the gears in the th400.
__________________
1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO |
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02-03-2006, 11:39 AM
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#10 |
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Registered User
Join Date: Nov 2000
Location: chimayo, nm, usa
Posts: 898
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Re: High pitch noise??
Thanks guys, it could be a th400 thing. It does seem to calm down after driving it a long time but it never goes away. The converter I bought brand new from B&M when I bought the tranny new from TCI probably less than 5k miles ago. Then the TCI died as they usually do, then I got a kit from TPI, and had it slapped in there, and after that, about 3 years after that is when it started with the noise. It might just need use, as I hardly ever get to drive this truck, and is hard to afford to drive it with the super poor gas mileage.
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02-03-2006, 12:02 PM
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#11 |
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Registered User
Join Date: Apr 2000
Location: Chester County PA, USA
Posts: 1,228
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Re: High pitch noise??
My motorhome did that . It had a th400 and my trans guy that rebuilt it said that heavy duty th400's have strait cut gears. And they wine. The other th400's have helical cut gears and dont wine. So you have a heavy duty th400.
__________________
72 k/10 short wideside 72 k/5 Blazer 72 K/5 Blazer - obstacle course racer 72 custom/10 8' bed 70 K/5 Blazer 67 C-30 GMC Flat bed 86 GMC K2500 Plow Truck 85 GMC K3500 84 M1008 85 M1008 77 G30 Motor Home 72 Sears 12hp Tractor Glenmoore, Pennsylvania |
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02-03-2006, 02:56 PM
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#12 |
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Registered User
Join Date: Nov 2000
Location: chimayo, nm, usa
Posts: 898
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Re: High pitch noise??
That makes sense, because as far as performance, it performs very well. Of course it does leak out some tranny fluid onto the garage floor when it's parked for long periods of time, but I've had that with all my older GM cars if they stay parked long.
Last edited by 72step; 02-03-2006 at 02:56 PM. |
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02-03-2006, 03:36 PM
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#13 |
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More Cowbell....
Join Date: Mar 2004
Location: Puckett, MS
Posts: 3,569
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Re: High pitch noise??
Yank's truck does/did that. Sounded like he had a blower. Found out it was the Torque Converter.
__________________
There once was a member from Puckett.....Who ( fill in the blank blank blank ) bucket |
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02-03-2006, 03:56 PM
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#14 |
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Registered User
Join Date: Dec 2004
Location: Arvada Colorado
Posts: 1,321
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Re: High pitch noise??
My TH400 in my C20 was making a whining noise when I first bought it. It would get a little better when it warmed up. Noise was from the transmission and a filter change eliminated it. Cheap thing to try.
__________________
Larry 1949 Willys CJ2A, Kubota Turbo Diesel engine, Warn Overdrive, 11 inch brakes, 12volt, Warn M8000 Winch "Little Green" 1970 Rustoleum Roller Red C20 Custom Camper 454 TH400 "Big Red" 1971 K20 6.2 Turbo Diesel 4x4 4spd Ranger Overdrive "Pumpkin Wagon" 2005 VW Beetle Diesel 44+ MPG "Silver Bullet" |
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02-03-2006, 07:57 PM
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#15 |
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Registered User
Join Date: Nov 2000
Location: chimayo, nm, usa
Posts: 898
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Re: High pitch noise??
Yup, will try, Thanks.........
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