Question about 1990 Buick LeSabre

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The gear shift just slips up and down - 1990 Buick LeSabre

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Hi and welcome to FixYa!

As a first course of action, I strongly suggest that you replace the automatic transmission fluid for if it's burnt the shifting tends to slip. If doesn't resolve by fluid replacement, I suggest that you replace the torque converter. The torque converter controls the shifting of the car that when it's faulty it may slip too.

Let's just hope that it can be resolved just by replacing the fluid to cut the cost. Once replaced, a smooth ride and shifting will be noticeable plus you can have better fuel mileage.

Hope this helps and thank you for using FixYa! Have a good one!

Posted on Mar 11, 2011

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Posted on Jan 02, 2017

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2001 Chevy S10 4x4 4L60E transmission works perfectly until 50MPH then I lose 3rd and 4th gear, 1st, 2nd and reverse are normal. Never happenend before, been parked since. Fluid is clean. Any ideas?


Are there any DTC's - diagnostic trouble codes ?in the PCM / BCM ? You have third an fourth below 50 mph but above 50 it down shifts to 2nd gear ,is this what your saying or you don't have 3rd or 4th gears at all ? Which engine did yours come with ? 2.2 L or 4.3 L You trans can set several DTC'S an not all will turn on the check engine light .
DTC B2722 (4.3 L) DTC P0218 (2.2 L) DTC P0218 (4.3 L) DTC P0502 (2.2 L) DTC P0502 (4.3 L) DTC P0503 (2.2 L) DTC P0503 (4.3 L) DTC P0705 (2.2 L) DTC P0706 (4.3 L) DTC P0711 (2.2 L) DTC P0711 (4.3 L) DTC P0712 (2.2 L) DTC P0712 (4.3 L) DTC P0713 (2.2 L) DTC P0713 (4.3 L) DTC P0719 (2.2 L) DTC P0719 (4.3 L) DTC P0724 (2.2 L) DTC P0724 (4.3 L) DTC P0740 (2.2 L) DTC P0740 (4.3 L) DTC P0741 (4.3 L) DTC P0742 (2.2 L) DTC P0742 (4.3 L) DTC P0748 (2.2 L) DTC P0748 (4.3 L) DTC P0751 (2.2 L) DTC P0751 (4.3 L) DTC P0752 (4.3 L) DTC P0753 (2.2 L) DTC P0753 (4.3 L) DTC P0756 (2.2 L) DTC P0756 (4.3 L) DTC P0757 (4.3 L) DTC P0758 (2.2 L) DTC P0758 (4.3 L) DTC P0785 (2.2 L) DTC P0785 (4.3 L) DTC P1810 (2.2 L) DTC P1810 (4.3 L) DTC P1860 (2.2 L) DTC P1860 (4.3 L) DTC P1870 (2.2 L) DTC P1870 (4.3 L) DTC P1875 (4.3 L) .
Shift Pattern This category contains the following topics:
?€¢
One forward gear only


?€¢
Two forward gears only


?€¢
Gear missing or slipping


?€¢
No upshift or slipping upshift


?€¢
No downshifts


?€¢
Non-First gear start


?€¢
Refer to First Gear Range Only - No Upshift .


?€¢
Refer to Third Gear Only .


?€¢
Refer to Second/Third Gear Only or First/Fourth Gears Only .


?€¢
Refer to Slips in First Gear .


?€¢
Refer to Slipping or Harsh 1-2 Shift .


?€¢
Refer to No 2-3 Shift or 2-3 Shift Slips, Rough or Hunting .


?€¢
Refer to No 3-4 Shift, Slips or Rough 3-4 Shift .


?€¢
Refer to No Part Throttle or Delayed Downshifts .


?€¢
Refer to Second Gear Start .

Feb 18, 2016 | Cars & Trucks

1 Answer

Trans wont down shift into first gear automatic


Pull the trans & rebuild it

Can't fix slipping

Feb 28, 2014 | Cars & Trucks

1 Answer

Automatic gear problems


name them there are a 50 A/T tranny standard symptoms.
name what works and what dont.
slips. (flare)
late shifts
early shifts.
skips gears, say 1 to 3rd?
down shifts wrong, early late or not at all.
only shifts hot or cold.
passing gear fails
down shifts on hills fails.
or? name it.

the FSM covers the 50 ways to fail (chart)
and the cures. and tests.
or
at
alldata.com

Feb 27, 2014 | Toyota Sienna Cars & Trucks

1 Answer

Jeep compass transmission problem


state the symptom , the FSM lists about 100.
and year,
but> ? (simple?)
slips? aka: flare or false neutrals. (doom)
fails to shift up or down automatically.?
car wont move.?
noise.?
passing gear dead.?
wont down shift on hills.?
cant shift out of park.?
stuck in 1 gear, name it?

Oct 23, 2013 | Jeep Cars & Trucks

1 Answer

My 1997 626 with 2.0 motor sometimes down shifts


Have the tranny flushed and new fluid put in, and a new filter.

Things are getting gunked up and sticky in there, the car is 18 years old now.

Sep 29, 2009 | 1997 Mazda 626

1 Answer

4l60e no forward or reverse gears operating


It sounds like your torque converter or the pump is broken.

Jan 12, 2009 | 1993 GMC Sierra K1500

1 Answer

2000 VW Jetta squealing when shifting from 2-3rd and hard shift down when going up hill


hi if its just second to thrid then the clutch is slipping on thrid gear look at the boxes oil level is important but look at the colour is it red and tranperant as this is ok if its brown its a sign of the clutches slipping i would try a stall test on thrid gear first and if its ok second gear [manually] see is the engine stalls at the correct rpm if you thinkabout it imagine you are in thrid gear in a manuual box and suddenly drop into second it would be hard shifting it could also be a faulty thrid gear solenoid yates210456

Sep 24, 2008 | 2000 Volkswagen Jetta TDI

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