need help with my sl gearbox problem - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 01-21-2004, 08:06 AM Thread Starter
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need help with my sl gearbox problem

1992 300SL 24 VALVES. AUTOMATIC 5 SPEED TRANSMISSION. THE CAR WILL NOT KICKDOWN TO A LOWER GEAR IF IM DOING MORE THAN 80MPH. IT WILL OCCASIONALLY BUT VERY RARELY WORK PERFECTLY BUT ON MOST OCCASIONS IM IN FIFTH GEAR ON THE HIGHWAY AND DO NOT HAVE OVERTAKING POWER AS MY TRANSMISSION WONT KICKDOWN. NOT EVEN IF I SELECT A LOWER GEAR MANUALLY. IN REGULAR EVERYDAY DRIVING THE TRANSMISSION WORKS PERFECTLY AND GEARCHANGES ARE SMOOTH. THE CAR HAS COVERED ONLY 65000 MILES AND IS IN IMMACULATE CONDITION. PLZ HELP AS NO ONE CAN FIND THE PROBLEM NOT EVEN MERCEDES MAIN DEALER IN LONDON OR FRANCE.
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post #2 of 4 (permalink) Old 01-21-2004, 03:11 PM
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RE: need help with my sl gearbox problem

[?]what is your rpm at 80 mph in 5th?

if you put your transmission in 4th and then speed up to 80 mph what is your rpm?

BECAUSE SIZE REALY DOES MATTER, W140
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post #3 of 4 (permalink) Old 01-22-2004, 12:46 PM Thread Starter
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RE: need help with my sl gearbox problem

AT 80 MPH ITS DOING JUST UNDER 3000 RPM. I THINK MAYBE 2900 RPM. EVEN IF I PUT IT IN 4TH GEAR IT WILL NOT DOWNSHIFT TO FOURTH. IT WILL GO AUTOMATICALLY INTO 5TH. EVEN IF I MOVE THE LEVER TO 4 IT WILL STAY IN 5TH. I CAN DROP IT TO 3RD GEAR AND IT WILL SELECT 3RD BUT WEN I MOVE IT TO 4TH GEAR IT WILL GO INTO 4TH FOR A SPLIT SECOND AND STRAIGHT INTO 5TH AFTER THAT. I THINK 5TH GEAR IS LIKE AN OVERDRIVE ON THIS AUTOMATIC TRANSMISSION. AS MENTIONED BEFORE SOMETIMES IT WORKS PERFECTLY BUT THATS VERY RARE. AND IF ITS WORKING FINE, WEN I SWITCH THE CAR OFF AND START AGAIN IT GOES BACK TO THE PROBLEM. ON THE GEAR SHIFTER IT HAS 2..3..4..AND THEN D. IF I PUT IT INTO 4 FROM STANDSTILL IT WILL START IN SECOND GEAR AS NORMAL UNLESS I FLOOR THE ACCELERATOR THEN IT WILL START FROM FIRST GEAR, BUT THATS NORMAL.... THEN IT WILL GO UP THE GEARS NORMALLY.. IT WILL CHANGE TO 3 THEN FOURTH BUT INSTEAD OF STAYING IN FOURTH IT WILL CHANGE TO FIFTH EVENTHOUTH BY PUTTING THE GEAR LEVER INTO 4 IT SHOULD NOT GO INTO FIFTH GEAR. I HOPE THIS CLARIFIES THINGS MORE.
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post #4 of 4 (permalink) Old 01-22-2004, 12:55 PM
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RE: need help with my sl gearbox problem

there used to be a device on those year transmissions called a modulater, very simple to replace, it may also be an electronic modulator but most are vacuum operated from a small hose. good luck
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