1985 500SL Transmission shifting problems - Mercedes-Benz Forum
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#1 (permalink) Old 02-29-2012, 07:15 PM
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1985 500SL Transmission shifting problems

I recently purchased a 1985 500SL.
I is going to need some work but a the moment my biggest problem is the Automatic transmission.
It had an intermittent issue with not being able to put the shifter in the Reverse, Park and in the 2dn gear position but other wise it appeared to be shifting fine.
I had the gear shift bushings replaced which at first appeared to address the issue. Also transmission fluid was added to bring it to the correct level.

Then when I was driving the car the other day it suddenly would not shift gears anymore accept at very high RPMs. The only way the car now shifts gears is if I rev the car upto 4500 rpm. I have since stopped driving the car and the issue of not being able to put the car in Park or reverse has returned as well.

I noticed that the tranmission cooling hoses connected to the radiator are leaking transmission fluid but am not sure if that may be related to the shifting issue.
I am wondering if this is an indicator of a serious transmission problem or if it is something that could be fixed without dropping the transmission.

I have gone ahead and ordered a new modulator, cooling hoses and transmission filter but am concerned the replacing those items will not address the problem and I was wondering if anyone has some suggestions,

Thanks,
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#2 (permalink) Old 03-01-2012, 04:50 AM
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Sounds like a working pressure issue. Are you sure the fluid level is correct and the filter is clean?

If it has been leaking for awhile and you have not topped up the fluid, yes, that may be the issue.


I had problems getting our 380SL to "go" when I stupidly put only 5 or 6 quarts in it after a filter change....
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#3 (permalink) Old 03-01-2012, 08:08 AM
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Quote:
Originally Posted by Brauny View Post
I have gone ahead and ordered a new modulator, cooling hoses and transmission filter but am concerned the replacing those items will not address the problem and I was wondering if anyone has some suggestions,

Thanks,
I think that you are on the right track. These are things that need to be done anyways and will probably cure your problem.

Unknown car? I would change ALL fluids and filters so that I have a benchmark point.

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#4 (permalink) Old 03-01-2012, 11:58 AM
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I hope your maintence fixes your problem. If your tranny is a ZF auto the ZF tranny is very expensive to rebuild. let us know what the fix is!
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#5 (permalink) Old 03-01-2012, 12:17 PM
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Having a flush and refill along with a new filter cures a lot of ills...not inexpensive to have done but much cheaper than a rebuild.
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#6 (permalink) Old 03-01-2012, 01:50 PM
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Thanks for the suggestions. The parts have come in. I will follow up once we have flushed the transmission, installed the modulator the filter and hoses. hopefully this will take care of the issues.
Thanks
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#7 (permalink) Old 03-04-2012, 06:01 PM
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Transmission jumps when stopping!!

Hi,

I am new to the forum, and will appreciate any assistance.

I have a 2000 C230 Kompressor and it has 155,000 miles. Today when I was driving home I went to stop at a red light (was going about 40-45 mphs) and when I applied the brakes I felt a jump when the transmission downshifted at about 15-20 mphs.

Note: Transmission shifts fine during driving.

Thanks for all the help!!!!
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#8 (permalink) Old 03-04-2012, 06:03 PM
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Quote:
Originally Posted by Texas500SL View Post
I hope your maintence fixes your problem. If your tranny is a ZF auto the ZF tranny is very expensive to rebuild. let us know what the fix is!
So what is a ZF tranny?
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#9 (permalink) Old 03-04-2012, 06:11 PM
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Quote:
Originally Posted by toni03103 View Post
Hi,

I am new to the forum, and will appreciate any assistance.

I have a 2000 C230 Kompressor and it has 155,000 miles. Today when I was driving home I went to stop at a red light (was going about 40-45 mphs) and when I applied the brakes I felt a jump when the transmission downshifted at about 15-20 mphs.

Note: Transmission shifts fine during driving.

Thanks for all the help!!!!
Wrong forum. This one deals with the 1971-1989 W107 models.
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#10 (permalink) Old 03-04-2012, 07:18 PM
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Quote:
Originally Posted by toni03103 View Post
Hi,

I am new to the forum, and will appreciate any assistance.

I have a 2000 C230 Kompressor and it has 155,000 miles. Today when I was driving home I went to stop at a red light (was going about 40-45 mphs) and when I applied the brakes I felt a jump when the transmission downshifted at about 15-20 mphs.

Note: Transmission shifts fine during driving.

Thanks for all the help!!!!


Welcome to BenzWorld, toni.


You need to post your question here.
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