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Username Post: Changing transmission fluid        (Topic#363159)
Outdoorutah 
Newbie
Posts: 15

Reg: 10-12-20
11-03-20 09:29 PM - Post#2806953    

I recently purchased a 2006 2500 6.0. it has 2 w/d and the 4L80e. There is 184,000 miles. Trans fluid has never been changed or it's been quite a while. It's dark red/brown. A hint of a burn smell to it but but strong..
Im looking into changing the fluid/filter. One mechanic said with that many miles on it without a change would hurt the trans. But another mechanic said it would be fine and probably extend the life.
Your thoughts?



 
GreatNorthWoods 
"6th Year" Silver Supporting Member
Posts: 1197
GreatNorthWoods
Age: 78
Loc: Littleton, New Hampshire,...
Reg: 03-31-02
11-04-20 04:46 AM - Post#2806960    
    In response to Outdoorutah

If there is a hint of a burnt smell it may be too late but if it were mine I would definitely change it.

Vern

1953 Chevy Belair Sport Coupe - 355 Blueprint Engine, 700-R4, EZ Wire, Vintage Air, Ididit column, Cruise/Tilt, PS, 59 Corvette Steering Wheel, 4-Wheel Discs, Posies Rear Springs, Coker Radials, Nova 10-bolt, Mustang II, NCA Continental Kit.


 
65_Impala 
Very Senior Member
Posts: 4643

Reg: 12-29-02
11-04-20 06:54 AM - Post#2806965    
    In response to Outdoorutah

Just dropping the pan, cleaning it and the re-installing with a new filter and filling with fresh oil is fine.

I would be leery of a power flush, but the bad reports from that could be due to people trying to flush a transmission that is already failing to see if they can save it.



 
Outdoorutah 
Newbie
Posts: 15

Reg: 10-12-20
11-04-20 08:53 PM - Post#2807007    
    In response to GreatNorthWoods

????????



 
Outdoorutah 
Newbie
Posts: 15

Reg: 10-12-20
11-04-20 08:54 PM - Post#2807008    
    In response to 65_Impala

???????? Thanks



 
Outdoorutah 
Newbie
Posts: 15

Reg: 10-12-20
11-04-20 08:59 PM - Post#2807009    
    In response to Outdoorutah

Sorry guys I have no idea what the deal is with the question marks. But thanks for your input. to add a little bit the temperature gauge for the transmission has never been above 200 and I have driven it up and over some of the steeper mountain passes in Utah so seems like it's running great but I will go ahead and change the transmission fluid just to make sure it's not worn out fluid and that it is still protecting the transmission



 
YOUNG57 
Frequent Contributor
Posts: 1291

Loc: Tennessee
Reg: 12-06-10
11-06-20 09:24 AM - Post#2807099    
    In response to Outdoorutah

I’m not of the following that believes changing ATF will ruin a transmission, no matter how old or burnt the fluid.

I suggest a power transmission fluid flush where they hook-up a machine to two coolant lines at the radiator that completely pumps out the old while pumping in fresh new fluid. It changes nearly 100% of the fluid without removing the pan or changing the filter. But if you want you can remove the pan and change the filter first.

Most dealers and some quick-change oil places have the machine and can do it, it’s not very expensive.

I have all my transmission fluids changed by machine at or about 100,000 miles. I also change my own differential and transfer case fluids at 100,000. But that’s jut me!





 
65_Impala 
Very Senior Member
Posts: 4643

Reg: 12-29-02
11-06-20 10:15 AM - Post#2807103    
    In response to YOUNG57

I read the claims about changing all the fluid, but I just don't see how it's possible without cycling back and forth through the gears and not just the shifter, but actually turning the wheels and letting it shift. Even then, old oil will remain in the various piston chambers.

Also, unless you pump a lot of new fluid in you won't get all the old out. It's not like only old only comes out as the new goes in. Old keeps mixing with the new as the new is added.



 
YOUNG57 
Frequent Contributor
Posts: 1291

Loc: Tennessee
Reg: 12-06-10
11-06-20 12:13 PM - Post#2807119    
    In response to YOUNG57

While using a machine to change ATF, they run the engine so the transmission pumps out the old fluid while the machine pumps in the new. The old and new fluids do not mix much, if any. You can tell by the color of the old fluid coming out and the color of the new fluid in the transmission when done, very, very different.

If you only drop the transmission pan to change the filter and replace the fluid in it you will have only replace 3 quarts of a 12 to 20-quart system.




 
Stinky 
Senior Member
Posts: 1733

Loc: Whitewater, CO
Reg: 05-25-01
11-06-20 07:31 PM - Post#2807147    
    In response to YOUNG57

IMHO...never ever do a power flush.

Just change the fluid.



 
65_Impala 
Very Senior Member
Posts: 4643

Reg: 12-29-02
11-07-20 06:08 AM - Post#2807165    
    In response to YOUNG57

Only pumping fluid in can only get the torque converter and the pan. That definitely doesn't change the oil in any of the apply pistons nor many of the passages in the valve body.

You could do about the same thing by putting the cooler feed line into a bucket and pouring in new fluid with the engine running.




 
elcamino 
Dedicated Member
Posts: 5486
elcamino
Loc: Lake Superior-Michigan US...
Reg: 03-30-00
11-07-20 02:50 PM - Post#2807207    
    In response to Outdoorutah

Capacities:
4 speed 4L80-E
Total Fill 13.5 quarts
7.7 quarts Pan Fill

ATF does NOT last forever. Its made with consumables that get depleted over time.

  • Quote:
Here is an excerpt from a GM Service Bulletin on flushing the trans fluid.

With the transmission warm, flush the cooler lines and cooler using DT-45096 oil cooling system flush and flow test tool.
Use compressed air to remove any residual fluid from cooler lines.
Remove transmission pan and drain transmission fluid.
Install the transmission pan and refill with new transmission fluid following fill procedure in SI to obtain correct fluid level.
Operate vehicle on hoist for 10 minutes.
Cycle through all forward gears and reverse.
Remove transmission pan and drain transmission fluid again.
Install new transmission filter, clean pan and magnet.
Install the transmission pan and refill with new transmission fluid following fill procedure in SI to obtain correct fluid level.
Approximate amount of fluid required - 14 qts.




Mike
2021 GMC Sierra Denali 6.2L/10-sp
2018 Polaris RZR S 900 EPS
2017 John Deere X738 Snow Blower


 
YOUNG57 
Frequent Contributor
Posts: 1291

Loc: Tennessee
Reg: 12-06-10
11-10-20 10:21 AM - Post#2807406    
    In response to 65_Impala

  • 65_Impala Said:
Only pumping fluid in can only get the torque converter and the pan. That definitely doesn't change the oil in any of the apply pistons nor many of the passages in the valve body.

You could do about the same thing by putting the cooler feed line into a bucket and pouring in new fluid with the engine running.




The torque converter and pan hold most of the ATF. The cooling lines and radiator hold most of the rest. The small passages and actuators in the valve body contain very little ATF.

The DIY method you mentioned, “putting the cooler feed line into a bucket and pouring in new fluid with the engine running” does basically the same as the dealership’s machine and is a very acceptable DIY method. But the machine adds the correct measured amount of ATF with minimal mixing of new with old.





 
someotherguy 
Senior Moderator
Posts: 29336
someotherguy
Loc: Texas
Reg: 08-01-03
01-13-21 12:53 PM - Post#2812018    
    In response to chevyking96

  • chevyking96 Said:
I will say that I had the exact scenario happen to me with my suburban at 220k miles and I gotta say I wish I had changed it. Ended up just replacing the transmission with a remanufactured trans instead of rebuilding it after reading these articles: ...


What scenario was that, may I ask? -- edit - removed spam since the "king" never came back to respond

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
kenh 
Newbie
Posts: 6

Reg: 09-12-20
01-17-21 06:40 PM - Post#2812286    
    In response to someotherguy

If you have facebook it is kind of fun to watch these guys. Seems to really know what is going on. Lots of tips on transmissions if yu watch a few of their vids.

https://www.facebook.com/CrichPrecisionTransmi ssio...

Ken



 
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