Transmission issues -
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post #1 of 3 Old 07-04-2013, 04:08 PM Thread Starter
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Posts: 255
Transmission issues

I recently acquired an 87 J10 with the A727 transmission. The truck only has 101000 miles on it and it had only been driven a few times a year for the last couple of years prior to me getting it. But after driving it for a few days with no issues, I could feel the transmission slipping a little.

Then I went to drive it to work and when I tried to leave, it would not go into reverse. So I checked the fluid and it was about a pint low, but smelled terribly burnt and was a blackish clear liquid without any trace of pink in it. I put in a pint and it went into reverse, but backing up was very jerky and the truck would shudder and it was leaking tranny fluid pretty bad. I drove it straight home but found that it didn't want to shift. Anything other than reverse and it wanted to drive forward, including park and neutral. Reverse was acting like neutral at this point.

Last night I dropped the pan to take a look. All the fluid coming out looked like old motor oil but smelled like burnt tranny fluid and had the consistency. The filter was completely black. The bottom of the pan was covered in very fine metal dust. Hoping for the best, I replaced the filter and put new fluid in it and it started shifting again but was still slipping. I drove it around the block and back to the issue of only wanting to drive forward unless in reverse.

I know, something is very wrong at this point, but does anybody have any thoughts on what the issue is?

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post #2 of 3 Old 07-10-2013, 10:19 AM
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Location: Austin
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You need to do a full rebuild on that unit. The clutches are going to be ruined which is all the black/grey material you found in the fluid. Things that can cause that would be the linkage not adjusted properly. For example if the shifter on the column is reading Drive but the trans is actually partway between drive and neutral it will cause the line pressure to be low and burn clutches etc. Next up would be checking the throttle valve cable which must be properly set its not just a kickdown cable like on a TH350 chevy. If its set too loosely the line pressure will be too low and the trans will slip badly and fry the clutches. I doubt this unit is going to come back from the dead without a full rebuild, but....

1. change fluid and screen
2. Clean valvebody with brake cleaner just hose it all down.
3. Adjust the bands (if they are worn and slipping tightening them up might buy some time providing they have material left on them)
4. Adjust the TV/Throttle cable linkage from carb to trans.
5. PRAY... :-)

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post #3 of 3 Old 07-10-2013, 01:22 PM
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I would have to agree that a full rebuild is in order given the black filter and fine particles in the pan. The clutches are already toast.
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