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These
recommendations do not
cover all possibilities.
They are some things to
check before you have
your transmission rebuilt. Always
check transmission fluid level first. Always run
a scanner on any computer controlled transmission. On
modulated transmissions make sure they have enough vacuum.
LEXUS
FIND THE MAKE OF YOUR
VEHICLE
CLICK ON THE YEAR OF YOUR
VEHICLE
| ES250 | 1990-91 2.5L A54OE | |
| ES300 | 1992-93 3.0L A540E | 1994-01 3.0L A541E |
| GS300 | 1993-95 3.0L A340E | 1996-98 3.0L A350E |
| GS400 | 1998 4.0L A350E | |
| LS400 | 1990-97 4.0L A341E | 1998 4.0L A350E |
| LX450 | 1996-97 4.2L A343F | |
| LX470 | 1998-01 4.7L A343F | |
| RX300 | 1998-00 4X4 3.0L A540H | 1998-00 3.0L A247E |
| SC300 | 1992-00 3.0L A340E | |
| SC400 | 1992-97 4.0L A341E |
A540E / A541E /
A540H / A247E
The
transmissions above are front wheel drive 4 speed automatic transmissions. They
are computer and throttle pressure controlled. Common symptoms are
transmission shifting erratic, slipping or not shifting at all. Also
the check engine light can come on.
External sensors like the throttle position sensor, vehicle speed sensor or
output speed sensor quite often go bad, causing these symptoms. Check the
throttle pressure cable that goes from your transmission to your carburetor or
throttle body depending on the configuration of your engine. Always run a
scanner first to see if a sensor is causing your problem. Check the shift
solenoids that attach to the transmission casing, sometimes they can go bad.
Many of the transmissions above have separate fill
for the trans fluid and the differential, so be care full! I see a lot of
differentials burn up
from lack of lube. Then the transmissions need to be rebuilt. On
most of these models, they have a diagnostic box you can retrieve codes with. The
location of this box should be in your owners manual.
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A340E / A341E /
A343E / A350E
The transmissions above are rear wheel drive
4 & 5 speed automatic transmissions. The A350E is the 5 speed. They are computer and throttle pressure
controlled. Common symptoms are transmission shifting erratic, slipping or
not shifting at all. Also the check engine light can come on.
External sensors like the throttle position sensor, vehicle speed sensor or
output speed sensor quite often go bad, causing these symptoms.
Always run a scanner first to see if a sensor is causing your problem.
Also
check
the throttle pressure cable that goes from your transmission to your carburetor
or throttle body depending on the configuration of your engine.
On most of these models, they have a diagnostic box you can retrieve codes with. The
location of this box should be in your owners manual.
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A40 / A40D
/ A42DL / A43D / A43D / A43DL / A43DE / A44D / A44DL / A45DL / A45DF
The transmissions above are rear wheel drive 4 speed automatics and shift timing
is controlled by the computer and a throttle pressure cable that connects from
the transmission to the carburetor or throttle body. Always check these
items first before your purchase a transmission. Common
symptoms are transmission shifting erratic, slipping or not shifting at all.
Also the check engine light can come on.
On most of these models,, they have a diagnostic box you can
retrieve codes with. The location of this box should be in your owners manual.
Make sure your clutch fan on the front of the motor is not starting to seize up.
This causes the engine to sound unusually loud almost like the transmission is
not shifting into 4th gear.