my 98 z71 transmission will not shift automatically only manually

Asked by Nov 17, 2015 at 09:47 PM about the 1998 GMC Sierra 1500

Question type: Maintenance & Repair

3 Answers

86,435

Is this something new or was it that way when you bought it? I wonder if someone installed a full manual shift kit in it.

2 of 2 people found this helpful.
785

I don't think that year had a kick down cable but if so check that its not broke if it does not have a cable then it has a TCM in which case that could be bad it may a clogged screen (tranny service) bad clutches inside trans bad or clogged valve body it is had to say but there are just a few common problems associated with the symptoms u have described one more thing it could also be the torque converter has gone or going bad

2 of 2 people found this helpful.
10

Well in that year they put 4l60e or 700r4 they both go bad really easy the 4l60e is way cheaper tho

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