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Author Topic: 77 c10 tranny "squeak"  (Read 7178 times)

Offline kamp77

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77 c10 tranny "squeak"
« on: March 10, 2009, 10:40:34 am »
my daily driver 77 c10 has this random squeak. it does it at certain mph in certain gears. like 10-15 in 1st 30 in 2nd and 35-40 in 3rd. it goes away in neutral or when i have the clutch in, or as soon as i go over/ under those mphs. the engine is a 250 l6 with a 3-speed column shifter.  also it doesnt do it every day, but doesnt seem to coralate with temperature.  thanks for any help and info

-matt
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Offline Captkaos

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Re: 77 c10 tranny "squeak"
« Reply #1 on: March 10, 2009, 10:58:00 am »
Throwout Bearing?  Can you tell where the sound is coming from?
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Offline Blue 82

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Re: 77 c10 tranny "squeak"
« Reply #2 on: March 10, 2009, 05:45:54 pm »
Another vote for the throwout bearing
this will turn to a squeal later
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Offline kamp77

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Re: 77 c10 tranny "squeak"
« Reply #3 on: March 10, 2009, 07:12:43 pm »
:( thats what i thought. It sounds like its coming from the trany.  When i do the throw out shouldnt i just replace the clutch?
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Offline ccz145a

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Re: 77 c10 tranny "squeak"
« Reply #4 on: March 10, 2009, 09:01:48 pm »
Quote
shouldnt i just replace the clutch?
and pressure plate as long as your in there.
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1975 C10 Silverado LWB, 454CID, TH400, 10bolt 3.42
11MPG Downhill w/tailwind (but there ain't no hills here)

Offline kamp77

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Re: 77 c10 tranny "squeak"
« Reply #5 on: March 10, 2009, 09:53:23 pm »
What does it meann if its an intermitent thing while driving. It also does it in neutral when i blip the gas now
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Offline VileZambonie

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Re: 77 c10 tranny "squeak"
« Reply #6 on: March 10, 2009, 10:03:00 pm »
You need to find out where it's coming from. Don't start throwing parts at it. If it was the release bearing it would do it without the truck moving too. Check your u-joints, and see if you can duplicate it jacked up.
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Offline kamp77

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Re: 77 c10 tranny "squeak"
« Reply #7 on: March 10, 2009, 11:28:44 pm »
I decently know my way around a car but im still a newb, what are u joints. Dont they connect the driveshaft and differential?
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Offline Captkaos

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Re: 77 c10 tranny "squeak"
« Reply #8 on: March 11, 2009, 12:21:45 am »
When it starts squealin' just barely push on the clutch pedal to see if it stops.
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Offline VileZambonie

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Re: 77 c10 tranny "squeak"
« Reply #9 on: March 11, 2009, 05:18:29 am »
yes they are on the driveshaft.
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Jay2D2

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Re: 77 c10 tranny "squeak"
« Reply #10 on: March 11, 2009, 07:48:41 am »
In theory the u-joints should not squeak in neutral.
Like Vile said jack all 4 wheels and then while youre in the truck have a buddy lay down beside -NEVER UNDERNEATH - and see if you can recreate the noise and have him pinpoint more of its location.

It an never be stressed enough to never go underneath a vehicle thats jacked up while running. Weve all heard the stories of a car collapse on someone. Some of you may even know someone who it happened to, I do.
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Offline kamp77

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Re: 77 c10 tranny "squeak"
« Reply #11 on: March 11, 2009, 05:16:57 pm »
how expensive would u joints be to fix?  also today it didnt do it at all... its the randomness that really confuses me ???
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Offline ccz145a

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Re: 77 c10 tranny "squeak"
« Reply #12 on: March 11, 2009, 09:26:45 pm »
less than $30 per joint.

get the ones with a grease fitting.

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1975 C10 Silverado LWB, 454CID, TH400, 10bolt 3.42
11MPG Downhill w/tailwind (but there ain't no hills here)

Offline kamp77

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Re: 77 c10 tranny "squeak"
« Reply #13 on: March 11, 2009, 10:43:29 pm »
Ok. So my best bet is to get under there and isolate where it is. And if its from the bell housing its throwout bearing and if its from the end of the drive shaft its the u-joints?
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Offline kamp77

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Re: 77 c10 tranny "squeak"
« Reply #14 on: March 18, 2009, 01:29:58 pm »
so being the rookie that i am i figured out that its not a drivetrain issue at all.... it was a belt . anyway thanks for all the help and good info
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