Transmission Fluid change or Flush

[Nap73]

What’s up guys

Quick question.

I have a 2004 GMC Yukon XL with 187k. I’ve had it for about 5 Months now with no real issues.

Recently I’ve noticed cold when the trans is put in reverse it feels like neutral. Now mind you this has only happened about 4 times.

I brought it to my mechanic today and he told Me something about a switch letting the trans know what gear has been selected. Maybe I’m explaining it wrong but that’s what I got.

The fluid is not brown or burnt.

He told me he would check that switch and then he suggested a fluid change. From what he’s telling me they have a machine that does this. My questions are:

A-From my understanding it’s a flush when done with the machine. Is this bad for my trans ?

B-Shouldn’t I change all the fluid + filter and gasket instead ?

C-Should I even be looking to have my mechanic do this or should I find a shop that specializes in transmissions ?

I would appreciate any input you guys have on this.

Thanks



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[swathdiver]

GM shops use the Trans Flow machine to to fluid exchanges. I did it about 20k miles ago, no problems. Next time will probably drop the pan and replace the filter and decide whether to also flush again.

 

[Nap73]

GM shops use the Trans Flow machine to to fluid exchanges. I did it about 20k miles ago, no problems. Next time will probably drop the pan and replace the filter and decide whether to also flush again.

How many miles on your truck ?


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[swathdiver]

How many miles on your truck ?

136K now, it's been 19,200 miles now actually and 662 engine hours since!

 

[Big Mama]

My trans guy says:

A if the trans is acting up do not do a flush

B the flush cleans the filter so no need to

C flush is about the only way to get all fluid out

D if trans issue do filter and fluid in pan.

As Chris did I had my 07 Denali done at 110000 k no issues

 

[Boatguy272]

Do you have a drain plug in your trans pan? I have a 2003 Denali 150 K miles with the larger trans so what I did was, drop the pan and change the filter and fluid. If you have the plug i would do a drain and refill after a week. That will get most of t he fluid swapped.

PERSONALLY I would not do a flush on a high milage trans.

 

[Nap73]

Do you have a drain plug in your trans pan? I have a 2003 Denali 150 K miles with the larger trans so what I did was, drop the pan and change the filter and fluid. If you have the plug i would do a drain and refill after a week. That will get most of t he fluid swapped.

PERSONALLY I would not do a flush on a high milage trans.

What I really need is a good transmission guy in the NY/NJ area.


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[Tonyrodz]

What I really need is a good transmission guy in the NY/NJ area.


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Where in NJ?

 

[Nap73]

Where in NJ?

I live in Queens now

But just bought a house in Monmouth county NJ


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[Tonyrodz]

I live in Queens now

But just bought a house in Monmouth county NJ


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Nice. I live in Monmouth county, where you at exactly? I know a guy. What are you looking to do to it?

 

[Nap73]

Nice. I live in Monmouth county, where you at exactly? I know a guy. What are you looking to do to it?

Want to get the reverse issue diagnosed and fixed

get a fluid / filter change.

You have a normal guy ?



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[Tonyrodz]

Want to get the reverse issue diagnosed and fixed

get a fluid / filter change.

You have a normal guy ?



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Yup, good dude, he's in Neptune on 33. He did my trans.

 

[Nap73]

Yup, good dude, he's in Neptune on 33. He did my trans.

Neptune is far no ?


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[Tonyrodz]

Neptune is far no ?


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Depends where you are in Monmouth county.

 

[alpinecrick]

If your trans is weak and probably ready to die, then a full flush can wash out the gunk in the seals and sometimes will hasten the death..........at least that's the theory. Your mechanic is probably using the power flush.

A complete, but more gentle flush can be done like this:
https://www.gmfullsize.com/threads/how-to-4l60e-transmission-flush-filter-change.179148/

All the coolers and filter changes in the world are not as good as keeping you ATF bright red. The factory recommended service intervals for all lubes and filters tend to be for optimum conditions, and today are driven mostly by European standards, which are more about waste lubes impact on the environment. I'm all about a smaller footprint on the planet but not at the expense of my trucks.


With the miles on your truck I would flush it and change the filter.

 

[dmad1]

When I had a '12, I had the fluid and filter changed at 100k. When I returned home, checked the fluid and it was still not a pretty pink. Bought 10 qts. and did a flush myself. Not hard to do at all. Just be sure not to loose the clip that holds the line in the radiator. You do not need to pull the radiator fitting out of the radiator. Check out videos on Youtube. I now have an '17 and the fluid does not have much pink to it, so am planning on doing the flush myself again in the next couple of weeks. The pan is hard to get of but there is a video showing how to press the exhaust down and remove it without having to drop the exhaust. Changing the fluid in the pan will not change but about half of the fluid. Won't get the torque converter, etc. If you have it done, be sure to ask for a "flush" and not just the pan. Just my 2 cents worth.

 

[Spacido]

When I bought my Tahoe, I drained everything. I always assume that the previous owner did not do anything about it. And I did well because I realized that the transfer oil was not the right one.

For the automatic gearbox, I make three partial emptyings with 600 miles of interval, like that, I remove as much as possible. At the last drain, I change the filter and I go on something clean.

Like many American owners, I do my maintenance alone, especially on the automatic gearbox, because in France, the mechanic is not trained on it.

The French or German manufacturers had released the concept of "gearbox without maintenance" ... result: the gearboxes automatic were good to change after 60,000 miles. Few companies can redo an American box and to redo a simple TH700R4, which I had on my Firebird 85, I had taken $ 1700

 

[ladorn45]

Where in Monmouth are you moving to its a pretty big area. I grew up in manalapan area. So i can def recommend places to stay away from if your in that area lol.