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I have a 2004 GMC Sierra Z71 Automatic . transmission would not shift properly. no bangs or clunks coming from transmission. changed transmission filter, changed VSS checked all fuses, and for vacume leak and all turned out fine, changed MAF sensor and took it out for a test drive and is not in first gear and wont come out park and reverse work fine but gears dosent change even in manual. any with any ideas of what i can do or try before i change out transmissions?

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  • Cars & Trucks Master
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Nothing wrong with the transmission that a proper fault code reading will not fix
it is sensor and pressure related and the fault codes will tell you which are faulty probably a TCM fault or wiring and connections

Posted on Jun 08, 2017

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Posted on Jan 02, 2017

emissionwiz
  • 75817 Answers

SOURCE: 97 gmc pickup with automatic transmission trouble

1st thing to do is test the system for codes, the problem is most likely a failed or stuck shift solenoid indside the trans, have you ever serviced the trans, sometimes a fluid and filter cahnge will cure these kinds of issues.

Posted on Nov 02, 2008

  • 14 Answers

SOURCE: transmission - no reverse

i had to put a new trans in my 2000 jimmy about a year ago there is something inside called a "reverse hub" its made from aluminum and not very hard to break..when mine broke i was stuck trying to move in reverse and it heard a pop then a winding down noise and sure enough its the reverse hub to fix it i just had the trans rebuilt

Posted on Nov 18, 2008

wwjdcgh
  • 114 Answers

SOURCE: automatic 3 speed transmission wont shift out of first gear

that is what they consider safe mode for those transmissions, they are a very smart electronic transmission it does that so you dont ruin the trans.
It has detected a problem and you must take it to a tech and have the codes pulled, could be as simple as a sensor or solenoid pack

Posted on Mar 09, 2009

csmock132
  • 4669 Answers

SOURCE: 2004 Jeep Wrangler - Clunking Noise when shifting out of Park

It could be lash in the differential which is normal, but it could also be a loose u-joint in the driveshaft. Check the rear driveshaft u-joints.

Posted on Mar 12, 2009

jmgldsmth
  • 1869 Answers

SOURCE: automatic transmission< while in drive wont shift

change your transmission filter: no or, very little movement and, no shifting indicates a clogged hydrolic circuit
do not continue to drive your car at that rpm until you fix this as engine damage can occur

Posted on Apr 28, 2009

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