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4th gear is slipping?; 4th gear is slipping?
Topic Started: Tue Feb 9, 2010 8:01 am (2,150 Views)
Aureliametal
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Not sure what is going on but my 4th gear is not working properly. I just got this car a week ago and I drove it once and it was shifting into all the gears but it was shifting hard. The second time I drove it, it shifted into 4th gear but it is not getting power to the wheels. I changed the fluid and filter and added some tranny additive. Now it shifts very nice but still is just slipping in 4th. Am I missing something? Mine is an 85 190e with auto tranny. I also noticed that when I put the fluid in a little came out of the tranny close to the rear above the tranny pan. Is that normal? Any help is greatly appreciated. Thanks a lot, Joe :no:
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Martrider
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Longest build time in history?
I had a similar problem in my Camel Trophy Discovery and Volvo 850, could be a bearing seal on the clutch or just time for a new clutch because the friction plates are at the end of their life.

If you think about it, the higher gears are where there is the most torque put though the clutch which is why you can only notice it then.

I would say it's new clutch time. :(
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Aureliametal
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What would that consist of? I forgot to mention that this car has 95,000 miles on it. Also you can feel it grabbing a little when you hit the gas while its in 4th but not fully. I took it out and beat it a little and got it to grab in 4th a couple times. Is that something I could fix with out taking it to a tranny shop? Thanks
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balamb37
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Grumpy Old Grampa with Dog
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I thought in your first post you say it is an Automatic Transmition, (gearbox) then it won't have a clutch or related items.
have I or somebody got thier 'lines crossed'.
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nezamr
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automatic gearboxes have clutch plates i think. These wear down over time.
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Aureliametal
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Right, it is an auto trans.
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Aureliametal
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So should I just replace the whole tranny?
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balamb37
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Grumpy Old Grampa with Dog
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That what you mentioned about oil coming out at the back top of the transmision, I don't think that is normal, sounds like a leak to me.

As for not going into fourth it could be a fault with the 'kick-down cable' being too tight.

But keep plugging as maybe Richy or Merctechi might know something and come up with an answer.
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balamb37
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Grumpy Old Grampa with Dog
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Hi Nezamr,

No "Autos" don't have clutch plates, they have a 'Torque Converter' which transmits the drive.
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Aureliametal
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Ok. Its going into 4th but isnt fully engaging, like its slipping really bad.
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balamb37
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That sounds like an 'oilway' is partly blocked, but I'm only guessing, you don't think dirt or dust could have got in when the fluid change was done do you as they are very very particular on cleanliness when doing a fluid change.
there is also a vacuum line connected to the box on the bottom somewhere check that as well that it isn't split or come off, I don't know what symptoms that would exactly give but it does effect the changes.
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chrismatheou
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Could be a number of things:
Transmission fluid
Bowden cable
Vacuum modulator
Or the box has simply had its day

I see you have changed the oil in the box already. It is very important that you fill the box up with the exact amount of oil that it requires as the pressure can blow oil out of the box and blow the crank shaft seal causing leaks.
Edited by chrismatheou, Thu Feb 11, 2010 12:27 am.
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Aureliametal
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how much fluid should it take?
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Ukmerctechie
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The oil out of the top of the box is due to overfilling.
The plug on the top of the box is a relief valve to vent off excess hot oil.
The slipping is probably due to a worn clutch pack,or wornout convertor(unlikely as you say the other gears are fine) or tired teflon rings in the K2 support flange.(Most probable)
Its cheaper/easier to change the box out than try to repair it.
The pressure modulator could also be the culprit as you said it was changing 'Hard' before it lost drive,but these usually induce a slip while changing gear,not when in gear.
As to whether auto box s have clutches.............They have lots and lots of them.
The drive is transferred thru clutch packs and brake bands,they are used to hold various elements of the epicylic drivetrain together to give the different ratios.
Posted Image
#31 #30 #28 are all clutch packs.
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Aureliametal
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Ok, so I think you answered my question. Just change out the whole box. Anyone have one for me? Im in the US, Pennsylvania. I cant find one cheaper than $350.00.
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balamb37
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Yes Ukmerctechie an auto GB has got clutch "packs" but not the type that 'Post' number 2 refers to.

That post is refering to 'A Clutch' and changing the 'friction plates' and as I wrote the Auto doesn't have that clutch unit, :no:

And as I wrote the "Torque converter" (Power Exchanger) transmits the power from the engine to the Gearbox with an Automatic gearbox, and not as with a Manual gearbox it is transmitted with the Clutch,

And at that point I was writing about how the power gets from the engine to the gearbox, Iwould have thought that would have been clear.

But back to the problem, I would still check that the " Control Pressure Cable" adjustment is correct before
spending big bucks on a replacement Box. ;)

And check the Fuid level as per book, as if the fluid was coming out of the relief valve on top of the GB then to me that stinks.
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stwat
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Just thought id mention that the auto gearbox oil level has to be checked with the engine running and up to temp.
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Aureliametal
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How much fluid should be added after doing a fluid and filter change? And how do I adjust the control pressure cable? Should it be loosened? Or tightened?
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balamb37
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Grumpy Old Grampa with Dog
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That is dependant on the model, and if the change has been done correctly.
All models except the 2.3 and 2.6 6.6 liters
And for the 2.3 and 2.6 7.1 liters.

I say "if the change has been done properly" because I have come across garages that don't know that the Torque Converter has also got a drain plug.

And also as stwat says checking the level and filling (topping up) has got to be done with the engine running and between you should also with the footbrake on put the selector in each of the positions, then check again.

As for the Control Presure cable, I think with the knuckle unclipped it should have approx. one mm play.

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Aureliametal
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How about the K1 spring replacement? Or modulator???
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Aureliametal
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Anyone?
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