Complete Trans Fluid Change

[Bob2C]

I have that same exact pump.
I modified the housing to flow more air, and i usually put a box fan blowing on it when running it.

I prime the pump using my power vac brake bleeder.

I also took the pump apart and found it to have a decent design for the money.

That’s a great idea to use the brake bleeder to prime. I figure it’s going g to be a while before I do it again. I put amsoil so it should last a while.


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[Jason in DLH]

Well, I received the 10 feet of 3/8” tube late last night and was able to put it down my dipstick tube to extract roughly 4 liters of fluid until it started sucking more air than fluid...



Took about 10 minutes with this small compressor (was only able to run a continuous 25-30 psi) and the Capri Tools Vacuum Bleeder (make sure to use thread seal tape on compressor fittings). A closer view of the Vacuum Bleeder...


A closer look at the hose going into the dipstick tube...



Here’s the fluid I was able to extract this method...



Next I’ll be removing the trans cooling line and starting the engine (carefully not running the pump dry)and removing more fluid before dropping the pan.

The fluid looked good. No signs of problems such as a burnt smell and although it looks completely black in the pictures there is a good pink tint to it.

 

[Jason in DLH]

Alrighty...finally finished up the transmission fluid and filter change tonight on the 2007 Yukon Denali.

Hardest part of it all was removing the filter gasket. Definitely will be using the special puller next time. It was in there tight!




Here’s some general notes that might help someone: after sucking as much fluid as possible from methods above I then slightly lowered the pan enough to put the vacuum tube inside and sucked up as much fluid as possible before dropping the pan. I then used a 30” Tekton pry bar and a floor Jack to lower the exhaust...



Major flexing, but did the job...



I was then able to remove the pan without spilling fluid all over the floor. Here’s the fluid that was left after all the sucking (I must have had the vacuum line on the shallow part).



Cleaned both mating surfaces and the pan well (I had to use 1500 grit sandpaper in a few isolated areas as there was some rust buildup). Good as new!



OEM filter and gasket part number is GM 24236517

I used RPT Shift Pro Filter and Gasket part number 997709 and it matched OEM perfectly.

 

[Jason in DLH]

 

[Jason in DLH]

I then used a 21 mm impact socket and tapped the new filter gasket in and used my hand to pound the filter in.

Attached the pan and torqued the pan bolts to 80 inch pounds (I’ve got the six speed) per recommended attaching sequence.

Thus far I’ve added 1 gallon of fluid using this 18” funnel as per Hayes manual and tomorrow I’ll complete the recommended fluid fill procedure.




Oh...and I didn’t need to detach the shift cable as it wasn’t in my way to remove the bolts...

 

[Jason in DLH]

Turns out I only extracted 7 quarts of fluid. Perhaps I didn’t let the engine idle long enough when I had the cooling line off (was nervous of running the pump dry). Was certain I should have extracted much more.

anyways...still waiting to do a hot check. Haven’t had the tranny up to temp yet to do so.

 

[JonnyTahoe]

This has probably been a topic of discussion time after time, but here is a good article from Popular Mechanics on how to do an ATF fluid replacement and how to remove ATF from “torque converter, clutch drums, valve body, and elsewhere” when you are replacing the ATF fluid.

https://www.popularmechanics.com/cars/how-to/a105/1272521/

I remember reading that magazine in school.

 

[TheEnder]

Chevrolet’s have sealed transmissions? I didn’t know that, i thought they had dipsticks. Something i need to know when i look at new Tahoes i guess. I know Chrysler doesn’t have any dipsticks as they’re fully sealed german transmissions, and that’s what i’m familiar with.


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[wjburken]

Chevrolet’s have sealed transmissions? I didn’t know that, i thought they had dipsticks. Something i need to know when i look at new Tahoes i guess. I know Chrysler doesn’t have any dipsticks as they’re fully sealed german transmissions, and that’s what i’m familiar with.


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I know GM was going to, or has moved to sealed transmissions, but the 2007-2014’s do not have a sealed transmissions.

 

[TheEnder]

I know GM was going to, or has moved to sealed transmissions, but the 2007-2014’s do not have a sealed transmissions.

Is that because of the 6L80 i think it’s called? Sorry, i’m very new to modern GM.


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