[Dstorey]

I recently talked to an owner of a 1996 sl500. Transmission goes into reverse when cold and when it gets warm hardly at all. Any ideas? I know that this is the first year with the 5 speed auto transmission that I think has electrical controls. My first thought is that actuators work better with colder stiffer fluid but basically I have no idea as I know nothing about these transmissions

thx!

 

[ou1954]

'96 transmission shifting

I recently talked to an owner of a 1996 sl500. Transmission goes into reverse when cold and when it gets warm hardly at all. Any ideas? I know that this is the first year with the 5 speed auto transmission that I think has electrical controls. My first thought is that actuators work better with colder stiffer fluid but basically I have no idea as I know nothing about these transmissions

thx!

Is the CEL on?

Seems to me the best investment would be to have a dealer run a scan to see if anything turns up. Could be fluid temp, actuator temp, TCM temp, or still something else.

 

[lowesguy]

I heard when it takes longer to engage reverse ,trans is on its way out, plan how you park it well,one guy drove it like that for 5 years.

 

[ou1954]

No Reverse

I heard when it takes longer to engage reverse ,trans is on its way out, plan how you park it well,one guy drove it like that for 5 years.

I once had a '49 dodge with the two-speed slush-o-matic transmission. It got so it wouldn't go into reverse. I sold it to a guy who said he could probably push it out if he needed to. He was happy, I was happy.

 

[lowesguy]

What's the going rate for an install now? $3500? @ an Indy,I paid $3400 for my SE 8 years ago and it leaked from the get go! Indy couldn't fix the leak on rebuilt,now I know he messed up the input seal. rip off .

 

[MAVA]

I would say you have a dead solenoid, but that is not true with this transmission. It does not have a Reverse solenoid.

Reverse works by pulsing one of the regulation solenoids to get reverse. It is a very unique process for this transmission.

Question? Is it the same effect in reverse with the switch in S or W? As these are two different ratios, use different friction packs too.

By looking at the logic table of this transmission. B3 is only unique to reverse, and works fine cold, but hot fails to work? It sounds like the problem is all valve body, but it could be a worn clutch pack too. Manual Valve is leaking(the valve that takes our shifts in the valve body. See attachment. See clutch application.

https://s3.amazonaws.com/sonnax-dev/uploads/valve_body_layout/vbl_file/17/Mercedes_722_6.pdf

See Condition on the top of last page of attachment.. It could be low of fluid. Have the 722.6 testing dipstick? Buy a 722.6 dipstick on ebay?
Wrong fluid? How old is the fluid?

Lastly, It could be just flat-out worn-out. I wrote a thread on how to determine the life left on a 722.6. It works for any year 722.6 equipped car.

http://www.benzworld.org/forums/w140-s-class/2212242-handy-way-determine-how-worn-out.html

One more, 96 was a bad year for the 722.6 to early 97 many flaws for the V8 & V12 cars...96-97 are only compatible with themselves. 98 to present(722.6 is still being made) are compatible with each other.

Martin