I took my 98 GS300 to my regular (trusted) mechanic due to some hard shifting. They road tested it and said "yep, it is shifting harder than normal between 2nd & 3rd, you need to take it to a transmission shop". They recommend a local Aamco. My concern is that I will have to drop $3-$4k on replacing or rebuilding the thing. Does anyone have any advice on moving forward, or has anyone experienced the same issue with this tranny?
Just yesterday (Jul 27, 10), my 01 GS-300, I purchased new, experienced the "harsh shifing from 2nd to 3rd with no kidding light throttle input. I've been reading up on it and sounds like it's related to Bulletin Number: 00502, bulletin date Oct 02, ENGINE AND ENGINE COOOLING - SUMMARY: ENGINE CONTROL MODULE (ECM) CALIBRATION UPDATED: HARSH 2-3 SHIFT CONDITION DURING ACCELATION WITH LIGHT THROTTLE INPUT. (NHTSA ITEM NUMBER - 10000250).
REF DATA CODE P0500, Vehicle Speed Sensor. The shifing problme may be related to this. This reports road speed to the Engine Control Module (ECM). This info is used by the speedometer, transmission shifting, to synchronzie emission sysetems and to adjust for various engine requirments. Other models (94 ES 300) that have problems with the VEHICLE SPEED SENSOR (VSS). The same transmission has been used on several Lexus model years on at least a million cars. Recognzie there might be a backup sensor. This can make diagnosis more difficult. Have Lexus diagnos it (have your research handy and any previous mx workorders related to this, tell them it emissions related and investigate if the emissions warranty covers it. Hope this helps and I agree with the person that said be wary of tranmission rebuild shops. Had an 88 Taurus with 90,000 miles rebuilt and it didn't last. Cost me $1,800 11 years ago.
98 Gs300 Transmission
in 93 - 05 Lexus GS300 / GS400 / GS430
Posted
Just yesterday (Jul 27, 10), my 01 GS-300, I purchased new, experienced the "harsh shifing from 2nd to 3rd with no kidding light throttle input. I've been reading up on it and sounds like it's related to Bulletin Number: 00502, bulletin date Oct 02, ENGINE AND ENGINE COOOLING - SUMMARY: ENGINE CONTROL MODULE (ECM) CALIBRATION UPDATED: HARSH 2-3 SHIFT CONDITION DURING ACCELATION WITH LIGHT THROTTLE INPUT. (NHTSA ITEM NUMBER - 10000250).
REF DATA CODE P0500, Vehicle Speed Sensor. The shifing problme may be related to this. This reports road speed to the Engine Control Module (ECM). This info is used by the speedometer, transmission shifting, to synchronzie emission sysetems and to adjust for various engine requirments. Other models (94 ES 300) that have problems with the VEHICLE SPEED SENSOR (VSS). The same transmission has been used on several Lexus model years on at least a million cars. Recognzie there might be a backup sensor. This can make diagnosis more difficult. Have Lexus diagnos it (have your research handy and any previous mx workorders related to this, tell them it emissions related and investigate if the emissions warranty covers it. Hope this helps and I agree with the person that said be wary of tranmission rebuild shops. Had an 88 Taurus with 90,000 miles rebuilt and it didn't last. Cost me $1,800 11 years ago.