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  #1  
Old 11-23-2006, 08:11 PM
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transmission

I have a 1981 300sd. I changed my transmission oil and filter yesterday, went to work and everything was fine. After work, I tried to go home, shifted from first to second, and it stayed in second. Reverse works fine, but it won't shift above second gear. The oil level is fine and all the vacuum hoses are attached. Any help would be appreciated.

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  #2  
Old 11-24-2006, 02:29 AM
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if ur tack is working, what are ur rpm's in second
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  #3  
Old 11-24-2006, 08:47 AM
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trans problems

Strange things can happen when an old tranny's oil is changed.
The new oil can act like a solvent and it starts eating the wear parts that were used to the old weak oil.
Don't worry too much until you check your servos .there are two that I know are easy (relative) to change without totally removing the trans.
If everything else has been checked and seems OK try servo , you can link onto them from this forum... I did ...and am greatful to those that took the time to post them for us.
Good luck
Charlie
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  #4  
Old 12-27-2006, 03:35 PM
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Did you have any luck?

I'm having the same problem my car I believe it is in second gear when it won't upshift anymore, it's definetly not in third anyway. I'm out of things to try.
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Old 12-27-2006, 04:12 PM
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I was curious to the type and brand of oil u used? Also, did you drain the torque convertor? Never, never, never use a rag that is not lent free when working on a mercedes benz transmission.
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  #6  
Old 12-27-2006, 07:22 PM
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So then an In-shop Transmission Flush would be a bad thing? with one of their $20,000 flushing machines w/detergent?
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  #7  
Old 12-27-2006, 07:44 PM
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Quote:
Originally Posted by adrenelin500 View Post
I'm having the same problem my car I believe it is in second gear when it won't upshift anymore, it's definetly not in third anyway. I'm out of things to try.
Look down beneath the accelerator pedal. You'll find a button switch. Disconnect the plug to this button switch.

Drive the vehicle.

See if it shifts better than before.

Report back with results.
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  #8  
Old 12-27-2006, 09:04 PM
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Originally Posted by Brian Carlton View Post
Look down beneath the accelerator pedal. You'll find a button switch. Disconnect the plug to this button switch.

Drive the vehicle.

See if it shifts better than before.

Report back with results.
I tried unhooking the kickdown last week and just for ****s and giggles I tried again tonight. Unfortunatlly no improvement. On the bright side for some reason the tranny is coming out of first now.

To give you a little history this is the chain of events.

(1)Tranny shifted fine.
(2)Tranny started to shift strangley- shifts were softer and early at about 2000 rpm through all gears.
(3)Checked fluid level to find it was black.
(4)Drained about 2 1/2 liters of dark fluid.Didn't really smell burnt but kind of odd.
(4)Tranny decided it didn't want to come out of first.
(5)Drained fluid once again, again very black and refilled.
(6)No change in tranny.
(6)Unhooked kickdown-no change.
(7)Let car sit a few days to do research.
(8)Tried adjusting Bowden cable and modulator to find there was no change(discovered black goo inside modulator cap).
(9)Cleaned all vac lines with carb cleaner-still no change but did notice that there was black fluid once again around modulator.
(10)Drained more tranny fluid again today, took for a drive with still no change.
(11)Drained and filled once more- fluid now getting a little better but still pretty black- still no change during test drive.
(12)Went for test drive tonight with no change-put pedal to floor rpm's went to 4500 and wouldn't go any higher-pulled over immediatly after. Parked car for about 10 seconds. Pulled away from curb to take her home and for some reason the tranny caught 2nd and then third. Like in (2) the tranny is shifting soft and early only now it's shifting a little earlier at about 1800 rpm's throughtout the gears.
It's obvious that the black goo under the modulator cap is tranny fluid. Does this point to anything?
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Old 12-27-2006, 09:23 PM
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Well, if it's not the kickdown switch or the Bowden cable.........and the problem is intermittent........it sounds like the valve body is the issue. Too much varnish accumulation preventing the valves from moving properly.

Probably time for some Trans-X..........and hope you get lucky.
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  #10  
Old 12-27-2006, 10:15 PM
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Quote:
Originally Posted by Brian Carlton View Post
Well, if it's not the kickdown switch or the Bowden cable.........and the problem is intermittent........it sounds like the valve body is the issue. Too much varnish accumulation preventing the valves from moving properly.

Probably time for some Trans-X..........and hope you get lucky.
Just as the tranny stopped staying in first and started shifting through it's gears eventhough it was doing so improperly I put the pedal to the floor which in turn would pull the bowden cable to it's stop point. Any thoughts on that?

Now to adress the varnish issue. Is it possible that the new fluid loosened up some of the varnish and could changing out the fluid a few more times help further. You have to also realize i'm not somewhere that I can drain the torque converter so with each drain and refill i'm just gradually improving the condition of the fluid. At this point i'd say i'm left with about 25 % old crap still in the system.I'm not sure we have Trans-x here in Canada. Does Lucas make a similiar product?
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Last edited by adrenelin500; 12-27-2006 at 10:58 PM.
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  #11  
Old 12-27-2006, 11:10 PM
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Quote:
Originally Posted by adrenelin500 View Post
Just as the tranny stopped staying in first and started shifting through it's gears eventhough it was doing so improperly I put the pedal to the floor which in turn would pull the bowden cable to it's stop point. Any thoughts on that?

Now to adress the varnish issue. Is it possible that the new fluid loosened up some of the varnish and could changing out the fluid a few more times help further. You have to also realize i'm not somewhere that I can drain the torque converter so with each drain and refill i'm just gradually improving the condition of the fluid. At this point i'd say i'm left with about 25 % old crap still in the system.I'm not sure we have Trans-x here in Canada. Does Lucas make a similiar product?
Pulling the Bowden cable to it's stop would serve to delay the shifts to the maximum degree possible..........the exact opposite of what you found.

Naturally, it's possible. But, simply changing fluid won't usually dissolve the accumulated debris in the valve body. Trans-X has the noted following and has offered some impressive results for some folks. I have no opinion on Lucas.
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  #12  
Old 12-28-2006, 08:37 AM
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Quote:
Originally Posted by Brian Carlton View Post
Pulling the Bowden cable to it's stop would serve to delay the shifts to the maximum degree possible..........the exact opposite of what you found.
Good point
Naturally, it's possible. But, simply changing fluid won't usually dissolve the accumulated debris in the valve body. Trans-X has the noted following and has offered some impressive results for some folks. I have no opinion on Lucas.
Ok ,TYVM

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