Transmission noise - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 05-02-2007, 12:28 PM Thread Starter
 
Join Date: Sep 2003
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
 
Transmission noise

I just purchased a 78 Jeep CJ5
The previous Owner said that he'd had a complete tranny and xfer case rebuild. A new clutch and throw out bearing were also installed

When I let out the clutch I hear a whirling or spinning sound
The speed of the sound is proportional to the speed of the engine
As engine speed increases the spinning sound increases

Any thoughts?

Thanks in advance
Doug
DJAustin is offline  
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 05-02-2007, 12:38 PM
Official Curmudgeon
 
CJ7Taz's Avatar
 
Join Date: Nov 2001
Location: Kansas
Posts: 4,705
Thanks: 2
Thanked 5 Times in 5 Posts
 
Could be a lot of things. Any of a number of bearings, thrust washers or even a shifter fork rubbing.

Check to see if it makes noise in neutral. Is it worse in one gear than others? Drive it in all gear including reverse. Shift the transfercase into neutral and shift through all the gears again. Let us know what you find.

There are 10 kinds of people in the world.
Those who understand binary and those who don't.
CJ7Taz is offline  
post #3 of (permalink) Old 05-02-2007, 12:51 PM Thread Starter
 
Join Date: Sep 2003
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
 
Guess I should have filled ina bit more information
This happens in all three gears plus reverse
and all four xfer case positions and any comnbination of the two
No one combination of gears is better or worse than another

Thanks again,
Doug
DJAustin is offline  
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 05-02-2007, 01:54 PM
Keyboard Implanted
 
thorjeep's Avatar
 
Join Date: Jan 2000
Location: In the process of finding it
Posts: 2,561
Thanks: 10
Thanked 1 Time in 1 Post
 
Does it happen all the time?

And real strange one does your jeep leak oil, maybe from the valve cover, leaking on top of the bellhousing?

Scott
1985 CJ7 T.H.O.R

"He brought me up out of the pit of destruction, out of the miry clay, And He set my feet upon a rock making my footsteps firm."
-Psalm 40:2
thorjeep is offline  
post #5 of (permalink) Old 05-02-2007, 02:07 PM
Official Curmudgeon
 
CJ7Taz's Avatar
 
Join Date: Nov 2001
Location: Kansas
Posts: 4,705
Thanks: 2
Thanked 5 Times in 5 Posts
 
That didn’t help.

Ok, when you put slight pressure on the clutch, does the noise stop?

Get up to speed and press in on the clutch and let it roll in gear. Try it in all gears and neutral. Does the noise go away? Any change?

There are 10 kinds of people in the world.
Those who understand binary and those who don't.
CJ7Taz is offline  
post #6 of (permalink) Old 05-02-2007, 02:32 PM
 
Join Date: Sep 1999
Posts: 5,383
Thanks: 0
Thanked 1 Time in 1 Post
 
I vote for the wrong, or improperly installed throw out bearing.
When the clutch is in, no noise, when the clutch is out, noise = throw out bearing...
Junk Yard Genius is offline  
post #7 of (permalink) Old 05-02-2007, 05:36 PM
I Might Just Know What I'm Talking About
 
Raduckal's Avatar
 
Join Date: Sep 1999
Location: Owensboro, KY
Posts: 1,905
Thanks: 3
Thanked 4 Times in 4 Posts
 
Yeap, Sounds like a throw-out bearing to me too.

"Beer is proof that God loves us and wants us to be happy."

Benjamin Franklin
Raduckal is offline  
post #8 of (permalink) Old 05-02-2007, 06:34 PM
I Might Just Know What I'm Talking About
 
JeepDawg's Avatar
 
Join Date: Dec 2006
Location: S. CA
Posts: 1,503
Thanks: 0
Thanked 0 Times in 0 Posts
 
Unless the throwout bearing is installed really wrong....I don't agree.

With the clutch out the throwout bearing should NOT be touching anything that is spinning.

Simple test...put it in neutral...let out the clutch. If you still get the noise, it's either the front bearing or pilot bearing. Tranny has to be remove in either case.

To confirm the throwout bearing...slowly push in the clutch...you should be able to 'feel' when the bearing makes contact with the fingers of the clutch. When properly adjusted, the bearing is about 1/2" to 1" from the clutch.

AKA DDawg16
84 CJ7, SOA, 5.7LTBI, 4L60E, 35"x12.5, 4.10 gears, F/Det, R/ARB, Full Roll Cage,
D44 Flat top in progress...
Link to my Frame up Restore
JeepDawg is offline  
post #9 of (permalink) Old 05-03-2007, 07:01 AM
Keyboard Implanted
 
Join Date: Aug 2001
Location: Vermont
Posts: 2,348
Thanks: 0
Thanked 0 Times in 0 Posts
 
Is this noise you have a dull (there might be somthing going on here) or is it a loud (there is defenitly something wrong here)

You have a 78 with a 3-speed and a gear driven x-fer case. Some noise is normal. (Some dull noise is normal).
My Jeep has a truck 4-speed (SM465 (I love that trans)) and a D300 (gear driven case) My Jeep has no carpet, or insulation on the floor, and the trans/tranfer case make a racket. When I compare the noises that my jeep makes to the other standard autos I drive, it is amazing how quiet they are. I have driven my roommates toyota pick up... it is way quite. I have some experence driving, and riding in a Saab 6-speed, that thing super quite, and smooth.

The fact of the matter is that tough transmissions have big gears, big bearings, and metal on metal contact between gears. They tend to make some noise.

Now of course, if your trans is making a LOT of noise, or there is a grinding, then my whole post is pretty much worthless. But if you only have a dull noise, I would say run it for a while and see what you see.

Once apon a time I played with legos... Now I have a Jeep
Olin18 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome