Question about 2000 Buick LeSabre

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2000 le sabre gears shifting hard or slipping

2000 le sabre 2wd. The first time this happened, I was in traffic going from a stop to speed when the gear seemed to slip or shifted hard. Check engine light came on. Code was P1742 (not 100% sure if that's it exactly). Car will run fine but every now and then the gears seem to slip or shift hard around 40-45mph but will run fine after that. Really don't want to have to replace the transmission if that can be helped. Suggestions?

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That is your ttc solenoid . it is your torque converter lock up solenoid. it is located in the transmission ,and to get the it you have re move the side pan on the transmission on the drivers side2000 le sabre gears shifting hard or slipping - 12_12_2012_12_05_46_am.gif

Posted on Dec 12, 2012

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1 Answer

My 2000 isuzu rodeo only drives on winter mode should i rebuild the transmission


Hello Joe.
please say what works and does not.?
and on what road surface you are on, pavement, dirt, ice? what?
and what does winter mode mean. tell actual shift modes.
and what transmission options you have.

no do not rebuild anything, first is diagnosis.
never guess. or go broke fast,
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limited slip diff option?
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this is part time 4wd and is not AWD , all wheel drive.
as such it is not for dry (ice-less) pavement and is for offroad.

so what surface are you driving on. 1st.
then in what mode.
are you messing up and using 4x4 on dry pavement
see here for what happens doing it wrong.
http://www.rubicon-trail.com/4WD101/driveline-bind.html

if you wind it up. the gear shift can lock up.
the solution is 2 ways.
drive to dirt shoulder and move slow and shift back to 2WD.
or if can't do that. (no grass , ice, no dirt)
jack up a front tire. and do same.
this unwinds the system.
then shift to 2wd.
some rare cars have partime system with a hidding slip clutch that
prevents wind up. this car dont.
nor does car have an AWD center differential.
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I have a Dodge 3500 Ram with an Automatic 6 speed transmission. I pull a Gooseneck trailer with a GVW of 16k lbs. I have no issues when I am on the road, but when I leave the highway or I'm in heavy...


sounds like you may havea torque converter lockup issue, one way to check is while in slower traffic (15-35mph) gear down your transmission such that you are at a higher rpm (2000-2500) then take your foot all the way off the throttle, if it is in lockup your engine rpm will stay about the same, if not it will go to about idle.

If the tcc doesn't unlock while shifting it will shift very hard and if it slips it will make your temperature increase

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Check the output sensor on the transmission,
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Trans shifts very hard after 5 minutes of stop and go traffic


A reason for hard shifting could be a problem with many things with various degrees of seriousness. It could be your ATF( automatic transmission fluid) is low or broken down and old. This would cause the hardness and the reason for stop and go traffic effecting it. Another possibility is your transmission is just shot, and the timing gears inside are worn and not properly shifting at the correct RPM causing a **** during shifting.

Some possibilties, not all!

~Lucas

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1993 Buick Le sabre


could possibly be the locking converter selinoed.

May 18, 2008 | 1993 Buick LeSabre

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