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 > Transmission shudder

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philh

Belleville MI

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Posted: 08/09/21 07:47pm Link  |  Quote  |  Print  |  Notify Moderator

shudder is often friction plates that have absorbed moisture in the fluid. Sometimes, changing fluid will clear it up.

Grit dog

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Posted: 08/10/21 09:40am Link  |  Quote  |  Print  |  Notify Moderator

dodge guy wrote:



Actually I just replaced an 8HP70 in a Tack Hawk. The fluid was black at 37k miles. However I believe the failure was the park solenoid. It was diagnosed by another tech in the shop, and I don’t trust his diagnostics (everything gets replaced type). With that though. I would just do a drain and fill a couple times and it should be good. The filter is built into the trans pan and isn’t cheap, that’s why it’s a one time use pan.But at 40k a drain and fill would be all I would do. Maybe do a filter/pan around 60-70k. They are a good trans, but the fluid is the weak point.


Ha, yeah, it triggers my vehicular OCD that I cant even SEE the trans fluid!
But assuming fluid looks good and not alot of trash (do they even have a magnet in the pan?), you'd forego the filter change until later. Interesting.
Thank you for the advice.


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Campfire Time

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Posted: 08/10/21 09:58am Link  |  Quote  |  Print  |  Notify Moderator

philh wrote:

shudder is often friction plates that have absorbed moisture in the fluid. Sometimes, changing fluid will clear it up.


Exactly, and that's what the wrong fluid was causing, moisture in what was supposed to be a sealed system.


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philh

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Posted: 08/10/21 07:24pm Link  |  Quote  |  Print  |  Notify Moderator

Campfire Time wrote:

philh wrote:

shudder is often friction plates that have absorbed moisture in the fluid. Sometimes, changing fluid will clear it up.


Exactly, and that's what the wrong fluid was causing, moisture in what was supposed to be a sealed system.


Transmissions are not sealed. They have a vent that allows the trans do breath as it heats up and cools down. Vent is above an OEM identified water line, which is determined based on how high water splashes when driven into puddles at various depths and speeds.

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Posted: 08/11/21 01:20am Link  |  Quote  |  Print  |  Notify Moderator

If fluid change does not solve issue then maybe a new Xsmn computer module (pcm) may be needed or reprogrammed if possible. My transmission also had long delays in shifting and new module $400.00 corrected the problem and it has operated like new from the factory since then.

SweetLou

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Posted: 08/11/21 07:53am Link  |  Quote  |  Print  |  Notify Moderator

dodge guy wrote:

That’s normally a fluid change. Our Ram truck 8 speeds will hang up in 2nd gear when coming to a stop. Changing the fluid fixes the issue. Anyone that believes in lifetime fluids is asking for a large repair bill. The fluid is expensive, but it’s still cheaper than a trans.

So I have the Ram 2013 68RFE Trans in my truck. I read some scary stuff on what is weak and can go wrong. Would a flush and filter change be a good preventative on these issues? I bought my truck used with 36K on it from the dealer back in 2015 and I made him flush and service the trans or I wouldn't buy it with out knowing anything about issues. So, if you recommend doing this, with which brand of fluid to replace it with?


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Campfire Time

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Posted: 08/11/21 10:46am Link  |  Quote  |  Print  |  Notify Moderator

philh wrote:

Campfire Time wrote:

philh wrote:

shudder is often friction plates that have absorbed moisture in the fluid. Sometimes, changing fluid will clear it up.


Exactly, and that's what the wrong fluid was causing, moisture in what was supposed to be a sealed system.


Transmissions are not sealed. They have a vent that allows the trans do breath as it heats up and cools down. Vent is above an OEM identified water line, which is determined based on how high water splashes when driven into puddles at various depths and speeds.


True. By sealed I mean no dip stick.

Grit dog

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Posted: 08/11/21 10:52am Link  |  Quote  |  Print  |  Notify Moderator

SweetLou wrote:

dodge guy wrote:

That’s normally a fluid change. Our Ram truck 8 speeds will hang up in 2nd gear when coming to a stop. Changing the fluid fixes the issue. Anyone that believes in lifetime fluids is asking for a large repair bill. The fluid is expensive, but it’s still cheaper than a trans.

So I have the Ram 2013 68RFE Trans in my truck. I read some scary stuff on what is weak and can go wrong. Would a flush and filter change be a good preventative on these issues? I bought my truck used with 36K on it from the dealer back in 2015 and I made him flush and service the trans or I wouldn't buy it with out knowing anything about issues. So, if you recommend doing this, with which brand of fluid to replace it with?


68rfe is nothing like the ZF 8 speeds.
Read IdaD post about his accumulator retainer. That imo is the one fatal flaw weak link.
As much as I don’t like them, they are about as reliable as other units, only clunky and Shift poorly.
You don’t mention how many miles since last service. So impossible to give a recommendation, but I wouldn’t go more than 60k between services. I also can’t see your trans fluid, which is the real indicator.

dodge guy

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Posted: 08/11/21 06:42pm Link  |  Quote  |  Print  |  Notify Moderator

SweetLou wrote:

dodge guy wrote:

That’s normally a fluid change. Our Ram truck 8 speeds will hang up in 2nd gear when coming to a stop. Changing the fluid fixes the issue. Anyone that believes in lifetime fluids is asking for a large repair bill. The fluid is expensive, but it’s still cheaper than a trans.

So I have the Ram 2013 68RFE Trans in my truck. I read some scary stuff on what is weak and can go wrong. Would a flush and filter change be a good preventative on these issues? I bought my truck used with 36K on it from the dealer back in 2015 and I made him flush and service the trans or I wouldn't buy it with out knowing anything about issues. So, if you recommend doing this, with which brand of fluid to replace it with?


A filter and fluid change is always a good thing to do. I have always done the trans fluid on my TV’s at 25k mile intervals. And the filter and fluid at 50k intervals. It’s the cheapest thing you can do to prolong the life of a transmission. As has been said the accumulator can be an issue. Although I have yet to see one fail. I would use the factory ATF.


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SweetLou

La Quinta, CA USA

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Posted: 08/12/21 08:33am Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

SweetLou wrote:

dodge guy wrote:

That’s normally a fluid change. Our Ram truck 8 speeds will hang up in 2nd gear when coming to a stop. Changing the fluid fixes the issue. Anyone that believes in lifetime fluids is asking for a large repair bill. The fluid is expensive, but it’s still cheaper than a trans.

So I have the Ram 2013 68RFE Trans in my truck. I read some scary stuff on what is weak and can go wrong. Would a flush and filter change be a good preventative on these issues? I bought my truck used with 36K on it from the dealer back in 2015 and I made him flush and service the trans or I wouldn't buy it with out knowing anything about issues. So, if you recommend doing this, with which brand of fluid to replace it with?


68rfe is nothing like the ZF 8 speeds.
Read IdaD post about his accumulator retainer. That imo is the one fatal flaw weak link.
As much as I don’t like them, they are about as reliable as other units, only clunky and Shift poorly.
You don’t mention how many miles since last service. So impossible to give a recommendation, but I wouldn’t go more than 60k between services. I also can’t see your trans fluid, which is the real indicator.

Last service is as I had mentioned at 36K at the dealer and who knows if they did filter. Supposedly they flushed it. That was 55K ago. Might be due to service this I haven't checked fluid or color in awhile as well

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