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Unread 01-25-2012, 01:38 PM   #1
a1980jeepcj7
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1980 CJ7 
 
Join Date: Jan 2012
Location: Rochelle, Illinois
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grinding noise under jeep cj7

When my 80 cj7 is moving, it sounds like the tranny is grinding really bad. I have a 4 speed and believe its a t176 tranny but not sure. I put a new release bearing, input bearing, pressure plate, and clutch in it and its still grinding just as bad. any ideas?

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Unread 01-25-2012, 03:09 PM   #2
82JeepCJ7
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Hows your U-joints look?
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Unread 01-25-2012, 03:18 PM   #3
jm708
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Is it only when its moving? My starter was hanging up on the fly wheel. It did it most of the time stopped or moving. Just a thought.
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Unread 01-25-2012, 05:12 PM   #4
dd4bama
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Quote:
Originally Posted by 82JeepCJ7 View Post
Hows your U-joints look?
What are symptoms of bad u-joints? Also, can a weekender change those?
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Unread 01-25-2012, 05:27 PM   #5
BagusJeep
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1981 CJ7 
 
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if you get under the vehicle and grab each proposhaft you can feel if there is any play at all in the joints at the end. If so they need changing.

I have seen up to 1/2" of play in neglected joints but they make vibration, not grinding.

To change you need the following tools:

- a vise
- a hammer
- a pair of pliers
- some odd nuts and bits and bobs of metal
- spanners

Unbolt the driveshaft and remove, takes less than 5 minutes. If you jack the vehicle up put it on stands but most you can get under without jacking which is MUCH safer. Get it on the bench and you will see the joint is held into the yoke on the shaft with a circlip in each end. Prise out the clips. You now need to force it out and puting it in a vise with several nuts etc to exert force on it will get it to move, I just beat it with a hammer and punch on the ground though this takes longer on old joints.

When you have it apart the bearing cups will drop off and you may find a lot of black dust and metal filings. This was your bearing.

Getting it back together make sure you lube the joint well before you install. There are needle bearings inside most of them so make sure you do not let them drop out and load them up with good quality bearing grease and pressure grease them once on, lubing the sliding joint as well. Lack of grease is a cause of failure.

The only other thing to know is that the shafts are balanced and the two parts are on a sliding joint that will drop apart. Mark them first so you get them back on the same way round or it will vibrate.

With practice (yes, you will get practiced) you can get them apart and replaced in about 30 minutes with simple hand tools.

However the grinding noise may be something else.
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Unread 01-25-2012, 06:00 PM   #6
dd4bama
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Thanks for the information.
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Unread 01-26-2012, 05:51 AM   #7
Fatbook
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Cat!
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