cj automatic trans probemls - JeepForum.com
 
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post #1 of 6 Old 09-13-2015, 06:33 PM Thread Starter
poppy1971
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1979 CJ7 
 
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Cj cj automatic trans probemls

Ok, so I have a problem the trans in my CJ seems to be stuck in drive, I have checked the linkage inside and out and everything is working as it should, I was looking for any thoughts or fixes for this problem

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post #2 of 6 Old 09-13-2015, 07:11 PM
lucdog
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1980 CJ5 
 
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What automatic is it? GM TH400, or a jeep Chrysler 999 or 929?

1957 WILLYS pickup,
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7
1989 YJ the CJ to YJ.
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post #3 of 6 Old 09-13-2015, 10:29 PM Thread Starter
poppy1971
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I believe its the gm 400 not really sure just got the Jeep and don't know much about what has been done to it
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post #4 of 6 Old 09-14-2015, 06:45 AM
lucdog
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The first thing I would check is where the shift arm is on the tranny. Check to be sure when the arm from the column moves, the threaded rod it's connected to moves as well. If the nut is loose that holds the arm on, It may have rounded the flats on the stud, or might have slipped off the flats. Bill

Edit, probably the easiest way to check this is to remove the rod from the arm, and shift/move the arm by hand.

If your Jeep is a Quadratrac (full time 4x4, then your tranny is a TH400.
You can also match the tranny pan shape with a image search on google. Try "GM transmission pan identification"

1957 WILLYS pickup,
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7
1989 YJ the CJ to YJ.
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post #5 of 6 Old 09-14-2015, 07:04 AM
JeepHammer
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1973 CJ5 
 
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Location: South West Indiana
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'79, more than likely a GM TH 400.
This is big trouble inside the trans if its a 400...
Pump pressure is reaching the forward drum if this is happening in reverse, Nutral or Park.

Time to see a trans shop to test pressure ports to see what seal/valve to see what gave up.

9 chances out of 10,
The center support bushing has given up, and allowed the drums to drop down on the 'O' rings on the 'Snout' of the center support.
This takes a rebuild to fix,
And you want to do it NOW before the weight of the drums wipes out the center support and drum (Galling from metal to metal contact).

A trans shop can hook up to pressure test ports and tell where the leak is,
And what it takes to fix the issue.

The TH 400 is the 800 pound gorilla of GM transmissions,
But all that heavy steel has to be supported, and it wears parts fairly quickly.
They are stupid simple to tear down and rebuild, and upgrades are available, so are parts so they aren't super expensive to rebuild.
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post #6 of 6 Old 09-14-2015, 04:20 PM Thread Starter
poppy1971
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1979 CJ7 
 
Join Date: Sep 2015
Location: Rensselaer
Posts: 7
just checked and its the 999 trans
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