1991 Buick Lesabre car only goes in 1st and reverse

Tiny
HOHOLD
  • MEMBER
  • 1991 BUICK LESABRE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 130,000 MILES
1991 buick lesabre. Car works fine in reverse an when placed in first gear. When placed in drive the car will go but will not shift into second, if I continue to accelerate (in drive)the tranny seems as if it begins to slip and evetually will no longer go but as soon as I stop leaving the selector in drive it will again go. I thought the tranny was shot so I replaced it with a used tranny and this tranny is doing the exact same thing. Leaving me to believe the problem is something other than the tranny. Any help would be greatly appreciated
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Wednesday, December 30th, 2009 AT 9:13 PM

3 Replies

Tiny
ZAOPC22
  • MEMBER
Most every auto trans has a cable and linkage and if it is loose or the linkage is broken or damaged it won't work properly or not at all. Like every cable they stretch and so this could be the problem or you need to do that what I just mentioned or flush the trans and change the filter. It could be a faulty neutral safety switch as well. There is also a transmission speed sensor it could be faulty might throw off the shifting. Go to Ammoco and have them do the work. Remember cheapest things first before you do the big repairs. Thanks David Newton
zaopc@yahoo. Com
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Wednesday, December 30th, 2009 AT 9:40 PM
Tiny
HOHOLD
  • MEMBER
I finished installing the used transmission the 22nd of dec. When I realized it was doing the same thing as the other tranny.I drained fluid and changed the filter and fluid, I also added a pint of "Seafoam trantune" and put in a new modulator valve as well. Nothings changed. Like I said in my original posting both trannys are doing the same thing. The only thing that makes me still think the tranny itself is bad is while in drive once the car reaches a certain speed it feels like the transmission is not engaging and will stop pulling unless I pull it down into first. Is this a protective measure or is this the transmission slipping. Again thanks for the help.
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Thursday, December 31st, 2009 AT 5:12 PM
Tiny
KHLOW2008
  • EXPERT
Hi hohold,

Did you try to retrieve for trouble codes?
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Monday, January 4th, 2010 AT 6:46 AM

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