GM tranny flushes?

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  #1  
Old 10-02-04, 05:44 AM
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GM tranny flushes?

1997 GMC Jimmy 84,000 4.3 4X4
I rcently dropped the pan and changed fluid and filter. There was a little bit of clutch material in the pan. So I decided to put a few miles on it then have tranny flushed and filter changed again. Now I keep seeing GM doesn't recommend this. Is this going to increase my odds of failure?

Thanks
Dan
 
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  #2  
Old 10-02-04, 05:49 AM
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Might want to check the other post here concerning flushing. Personally I would stick to regular fluid and filter changes, your best insurance.
 
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Old 10-02-04, 04:58 PM
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If you change the filter you will mostlikely be ok.How much is a little clutch material?I ask because no clutch material is normal.If you have clutch material in the pan the trans has been hot or the clutches are delaminating for some reason.Do you or have you had a trans code in the pcm or a harsh 1-2 shift?If so you may need a valve body in the trans.
 
  #4  
Old 10-02-04, 05:35 PM
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I have had a rough 1-2 shift before I dropped the pan and changed the filter. This happened after being on highway for a couple of hours.
 
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Old 10-02-04, 06:17 PM
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The general rule of thumb is to NEVER flush a transmission that has extremely high mileage without previously being done or one that is exhibiting any problems at all. A flush will usually make the problems much worse and sometimes a complete failure will be triggered. If you have metal, a rebuild is your only option.
 
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Old 10-02-04, 06:32 PM
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I didn't find any metal in the pan.
 
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Old 10-04-04, 03:49 PM
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Originally Posted by DAN75321
There was a little bit of clutch material in the pan.
Just as serious as metal
 
  #8  
Old 10-04-04, 07:24 PM
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So now what? Should I be planning on a rebuild? It seems to be shifting smooth. I have only taken short trips so far. What would be a cause for this? The only thing I've ever towed with it is a small fishing boat, maybe 20 miles. I don't consider 84,000 miles alot.
 
  #9  
Old 10-05-04, 03:05 PM
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The harsh 1-2 shift would indicate that the valve body needs replaced and if you had someone check for codes you may find a p 1870 trans component slipping.With that info now we know why there is clutch material in the pan.You could change the valve body and extend the life of the trans because in the event it does get rebuilt at some point it will need the valve body so it doesn't fail again.I have put valve bodies in some of these and they are still going strong over 30k miles.
 
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