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Thread: More transmission issues
03-26-2010, 06:22 PM #1
More transmission issues
Hey guys, got the tranny to stop dumping fluid but now it developed a real problem. When it first starts up and I engage the tranny, it runs through the gears fine. After a few minutes it will drop from third to second. Can manually shift down, then slid the shifter to D and it shifts up then drops again. Think the bands toasted but not sure. Replaced the modulator valve and fluid and filter. Hope it can be saved, but do not hold out much hope.
Thanks in advanced
Dana PelletierDana South Carolina
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2003 Trailblazer LT
03-26-2010, 06:43 PM #2Jim
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03-27-2010, 10:03 AM #3
Hi Jim, Tried cleaning out the steel line had some restriction, cleaned it out. replaced the rubber hose connections on the line but still same problem. Question, can you tighten or adjust the band? if so how and where. I heard the adjuster is under the pan by the valve body.
I really appreciate the help.
03-28-2010, 07:41 AM #4
03-28-2010, 01:06 PM #5
Sorry about the lack of info. Have the th400. The fluid was medium dark, but not burnt smelling, the filter was really bad the magnet had the usual crap on it and some grit in the pan. no peices or chunks of gears or the like. I'm afraid the only cure is a rebuild. but any help is greatly appreciated.
Edit...The tranny engages immediately when shifted to D, runs through the gears then drops into 2nd and stays there. When I stop, it shifts through the gears goes to third then drops again
Last edited by rustyk2; 03-28-2010 at 01:10 PM.
03-28-2010, 06:13 PM #6
Try unplugging the kickdown wire at the gas pedal or at the trans. Either end. If the switch is stuck it will do what yours is doing.
03-28-2010, 06:45 PM #7
Thanks, will try that tomorrow, getting late and raining in SC. thanks again for all the help. Could the detent switch be bad?
Last edited by rustyk2; 03-29-2010 at 05:02 PM.
03-28-2010, 08:31 PM #8
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Please keep us informed im kinda learnign as this thread progresses. Since alot of my buddies have these trannies...Mike
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03-29-2010, 05:01 PM #9
tried to unplug the wire, got it off, no change still dropping third. Any more options?
03-29-2010, 05:22 PM #10
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