2004 Suburban - Transmission - Erratic Shifting??

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  #1  
Old 10-04-10, 01:52 PM
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2004 Suburban - Transmission - Erratic Shifting??

4-wheel drive, 80k miles, a lot of mountain driving.

Had tranny serviced at 75k. They said fluid and pan looked real clean.

I have noticed that when I am going up grades, anywhere from 40-60mph and have cruise control on, the downshifts are becoming more erratic timewise. Once on Friday, it downshifted, almost immediately upshifted, and then downshifted.

Yesterday, a couple of times when I was costing up to a red light, and the light changed, there was a little lag between the time that I stepped on the accelerator and when the transmission picked up.

Any hints?

No CELs, If I get a code reader from the auto parts store, what might I be looking for?

Thanks
 
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Old 10-04-10, 04:42 PM
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SIMPLIFIED VALVE BODY RECONDITIONING

Are (Any or all) DTC’s (TCM) Transmission Control Module present?

P0741
P0742
P0752
P0756
P0757
P0894

HARSH OR DELAYED SHIFTS, SLIPS, NO DRIVE, NO REVERSE. (Yes)

If yes to any of the above, then address the TSB that is out for the problem you are describing. I'm not sure about the TSB number below.

08-07-30-001

Have a dealer run your VIN. If not the above TSB, then another, but definitely a TSB is out, and your first course of action should be to address it, if not already addressed.
 
  #3  
Old 10-05-10, 09:50 AM
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Thanks for the quick reply.

Just scanned the vehicle with a code reader. No codes stored.

Have had issues with the two closest Chevy dealers (i.e. had oil changed and they didn't snug up filter so it started leaking about one week out.

Will a competent transmission shop have access to the TSBs?
 
  #4  
Old 10-05-10, 10:06 AM
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Many shops now use ALLDATA which includes all TSBs....whether they would have the required tools or software to fix it might be another matter.

A Midas where I used to live had access to the TSBs and printed a few out for me..but naturally they weren't equipped to fix everything.

Also...I think some code readers will only pull engine codes. I have a tranny problem with my Mazda...but my lower-mid grade reader will only pull engine codes..even though my O/D light is flashing indicating a problem.

Sometimes the Dealer is your best option.
 
  #5  
Old 10-05-10, 01:35 PM
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Any tips on how to find a reputable dealer??

Also, is it reasonable for the dealer to share the codes that they find and TSBs with me, with their estimate?

FJ
 
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