Transmission Flush Opinions

[Sharpz]

1 hour ago, Black02Silverado said:

No, that is why there is a filter.  But if they are saying they flush the filter then that makes me believe that it pushed what the filter caught out into the fluid and you don't want that.  Drop the pan, remove the filter that is dirty, replace with new and go from there.

 

Dexron VI has been out since 2006 so it is a better fluid then the old dexron III but GM's isn't a full synthetic

I didnt realize the write up I suggested from this site, came from your write up bud. Ive read both and it surely did.  I am glad you posted that info on this thread or I might never have known.  

[diyer2]

16 hours ago, Beamie said:

Thanks for that idea. It got quite a lot of negative feedback. Is yours an older generation perhaps?

I think mine is 2 years old. You can find negative opinions on everything. I think it worked great. I have used it many times for fluid removal. For fluid removal get the fluid warm. Start the truck and warm the trans fluid. 

 

I wouldn't do a flush on any trans. My opinion. A flush was invented to make easy fast money and let the public believe it's works. Lots of people have had it done and will say it works. Would you flush an oil filter?

 

I have done pan drops for years and I have never seen a trans filter plugged up. The debris is always laying in the bottom of the pan. 

Keeping the fluid fresh is the goal. Doesn't matter how you do it. 

I welded a drain plug into the metal trans pan on my 93 4l80E.

 

It is so easy to keep the fluid fresh with the extractor I mentioned I do it every 25 K miles.  

Edited September 5, 2021 by diyer2

[KARNUT]

I bought that product per his suggestion over one year ago. Works great. I did two draws on my Avalanche transmission. I have lent it out to family members, it gets well used. Avalanche still has the original transmission at 178K miles. 

[Beamie]

22 minutes ago, KARNUT said:

I bought that product per his suggestion over one year ago. Works great. I did two draws on my Avalanche transmission. I have lent it out to family members, it gets well used. Avalanche still has the original transmission at 178K miles. 

 

So you evacuate the pan and drop it for a filter change each time?

[diyer2]

NO! Beamie. Remove, draw, suck out fluid, replace fluid. 

[Beamie]

Thanks for all the information guys.

 

I'll get out there to see if I think I can get the pan off or will need to pay someone to try get it done.

I don't doubt that the exhaust head pipe nuts will be in sad shape here in the land of winter road salts.

 

I'm convinced that the machine service route sound like a potential risk *that I won't take) and that there are alternatives to get a majority of the fluid swapped if access to the filter turns out to be a problem. I know it's a half way last resort but perhaps better than nothing if needs be.

 

 

[Beamie]

3 minutes ago, diyer2 said:

NO! Beamie. Remove, draw, suck out fluid, replace fluid. 

 

Thanks again.

[KARNUT]

51 minutes ago, Beamie said:

 

So you evacuate the pan and drop it for a filter change each time?

I don’t drop the pan. Never do. I exchange the fluid. If the filter is clogged there’s something going on that’s not good. Believe it or not changing the fluid in that case would probably speed up the transmission failure. Back in the day the harder I worked my truck the more I change the fluid. 

[Beamie]

Now that I've looked closer, there is very little play in the exhaust crossover pipe but the head pipe nuts may come off if the stud bolts are cleaned up a bit with a wire brush/wheel.

The heat deflector shield doesn't look to be an issue BUT the shift linkage bracket over laps the pan edge quit a bit and the torx (assumed) bolts feel to be in bad shape. I didn't gent any that I have to fit well due to corrosion. A drive shaft is running blockade for getting vice grips on them if required. This may be pointing to a siphon and refill for the time being.

[Beamie]

On 9/4/2021 at 10:29 AM, diyer2 said:

Beamie,

I used this to remove as much fluid as I could before trans pan removal. Worked great.

https://www.amazon.com/gp/product/B0002AJR8E/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

 

 

How much is "as much as I could" be? Do you thing it was mostly empty?

[diyer2]

6 quarts.

2012 Sierra 5.3L 4x4 6L80E trans.

[Beamie]

10 minutes ago, diyer2 said:

6 quarts.

2012 Sierra 5.3L 4x4 6L80E trans.

Ok thanks.

I have a 4 speed, 4L60E and wondered if the tube could make it all the way. Some (other) extractors hoses didn't make it far enough in to do the job.

[diyer2]

The tube on the extractor I use, recommend has plenty of tube.

[pokismoki]

just do the flush from cooler line cost $5 for the hose to connect to the cooler line, pump it out... I usually run 3 gallons thru.

 

I highly suggest installing an AUx spin on filter they do catch lots of trash the course pan filter misses

[Beamie]

32 minutes ago, pokismoki said:

just do the flush from cooler line cost $5 for the hose to connect to the cooler line, pump it out... I usually run 3 gallons thru.

 

I highly suggest installing an AUx spin on filter they do catch lots of trash the course pan filter misses

I think you are right. I looked closer at my pan and just below the bottom of the dipstick tube the bottom of the pan has an upset plateau that would keep the siphon tube at least an inch above the deep portion of the pan.

 

I am curious about the direction of fluid circulation. When the fluid line is used to drain, is it pulling the fluid from bottom of the pan and circulating through the transmission or directly out?

 

Is a connector needed for the fluid line method at the cooler? Does the cooler need to be plugged when the line is removed and used to drain?

 

Edited September 7, 2021 by Beamie