10 speed transmission fluid change interval?

[BAJ086]

Dealer is telling me the 10 speed in my Trailboss is not serviceable and does not require a fluid change.
In owner's manual it says every 45k for severe duty (which I'm not), but if it's not serviceable, why would it list that interval?
Anyone heard this? Thanks.

 

[TonyBoss]

The wonderful engineers at gm have made service on the 10sp almost impossible for a diy. I would think under normal service conditions 50K would be a reasonable interval. I have read conflicting information regarding fluid/filter change but will err on the side of caution myself.

 

[scotman623]

It’s NOT serviceable to us without the correct tools, dealer can definitely do a service on it… I miss the days when everything was easier for me to work on myself.. I plan on having mine done at 75,000 miles, at 54,000 now..

 

[BAJ086]

My dealer said they couldn’t service and it didn’t need to be changed EVER, was a sealed system.

Knowing that wasn’t right, I called 2 other dealers and they both said it was, one said at 50k the other at 30k. I’m going with 50k.

Sad these dealers are clueless.

 

[BAJ086]

It’s NOT serviceable to us without the correct tools, dealer can definitely do a service on it… I miss the days when everything was easier for me to work on myself.. I plan on having mine done at 75,000 miles, at 54,000 now..

Thank you

 

[TonyBoss]

My stealership charged $499 for a flush- 24 quarts run thru the trans-no filter change. Ouch.

 

[Trail Brian]

All chevy trucks I have had are 50 k ... last time I did my previous truck the tranny was never the same.... never... bad enough I dumped the truck and got the TB.......

 

[Baz]

Dealership service technicians are such a gamble in my experience. I never know if I’ll get the seasoned technician who takes pride in their craft or if I’ll get some dumb f*cker that can’t even tighten the new oil filter during an oil change.

 

[scotman623]

I cringe anytime I have to walk into the Service area…

 

[Sly]

So I was at Valvoline this weekend doing an oil change. My 2020 TB has a little over 45700 miles. Valvoline also said my front and rear differential and transfer case also need to be serviced. Which I already knew and was planning on do this work too. The technician said that the transmission can't be serviced and only the dealership can do that. The technician was telling me GM won't release the "special tool" needed. The technician said that GM has the tool needed locked physically to the machine that is used to exchange fluid. So no one has been able to replicate the tool.

So my question is has anyone done a fluid and filter exchange on their transmission has part of regular service? And was the dealership the only place you can go.

 

[Trail Brian]

So I was at Valvoline this weekend doing an oil change. My 2020 TB has a little over 45700 miles. Valvoline also said my front and rear differential and transfer case also need to be serviced. Which I already knew and was planning on do this work too. The technician said that the transmission can't be serviced and only the dealership can do that. The technician was telling me GM won't release the "special tool" needed. The technician said that GM has the tool needed locked physically to the machine that is used to exchange fluid. So no one has been able to replicate the tool.

So my question is has anyone done a fluid and filter exchange on their transmission has part of regular service? And was the dealership the only place you can go.

ok….I had a 2018 Tahoe all tittied up … 5.3 with a 6 speed …. truck and tranny ran perfect … 50 k ok let’s flush the tranny …. that was the beginning of the end …. within 50 or c so miles the tranny blew up and they serviced it …. was so bad going to the baja with a cargo trailer … bla bla three dealer ships nothing but shit …. traded for my 6.2 2021 LT … got 42 k on her now ….. service tranny ? take the service manager for a ride have him drive and make notes of temps …. have them sign off …. If not ? F it … I have recently learned there are 4 different tranny fluids for chevy GM trucks … my tahoe pulling 1500 pounds hit 280 f then shuts the truck down … my Lt has never seen above 173 with a 5k boat ….?that’s all I got … dammed If you do Dammed if you don’t lol sorry rant over

 

[Transient]

I just tried using the mychevrolet app to look up when the trans should be serviced. In GM's infinite wisdom they decided to make the owners manual inaccessible through the app. Damned if I'm getting out of bed to go get the book from the truck.

Edit: looking up the mileage milestones via the app there was nothing showing service the trans fluid and filter at every internal from 15,000 to 82,500.

 

[Gangly]

For severe service duty you are supposed to change the fluid and filter every 45k miles on the T1's. There is no service interval for normal service duty up to 150k miles. The service chart table stops at 150k miles. No special components or tools are needed, a simple hand pump can be used.

Transmission Fluid Fill Procedure for 10L90

TRANSMISSION FLUID FILL PROCEDURE

For equivalent regional tools, refer to Special Tools.

Caution: For all 10 speed RWD transmission applications, use ONLY Dexron ® ULV transmission fluid. Failure to use the proper fluid may result in damaging the transmission internally.

Warning: Check the transmission fluid level immediately after adding fluid and before vehicle operation. Do not overfill the transmission. An overfilled transmission may result in foaming or fluid to be expelled out the vent tube when the vehicle is operated, possibly causing a fire that may result in serious bodily injury or severe vehicle damage. Overfilling will result in possible damage to the transmission.

Check the transmission fluid level, refer to Transmission Fluid Level and Condition Check.

Case Plug Method

Caution: For all 10 speed RWD transmission applications, use ONLY Dexron ® ULV transmission fluid. Failure to use the proper fluid may result in damaging the transmission internally.

Note:

1. • The quart containers of Dexron® ULV must be shaken to stir up the additives before pouring.
   • Do NOT use Dexron® VI or Dexron® HP.
   • When the oil level check plug is removed with the engine OFF, transmission fluid may drain from the hole.
2. Based on accessibility, transmission fluid may be added through the side automatic transmission case plug (1) hole or through the top automatic transmission case plug (2).
3. Clean around the automatic transmission case plug (1 or 2).
4. Determine the approximate amount of fluid needed to fill the transmission, based on the repair performed. Refer to Approximate Fluid Capacities. To avoid an under-fill condition, slightly overfill the transmission, and then allow the extra fluid to drain out through the oil level check plug during the tranmission fluid level and condition check procedure.

Note: The DT-45096 - flush and flow test tool is being utilized as a convenient method to pump the fluid into the bottom pan. A suitable hand pump may also be used instead.

1. Add transmission fluid through the automatic transmission case plug hole. Refer to Transmission Fluid Cooler Flow Test and Flushing for complete DT-45096 operating instructions. Use the FLOW position on the main function switch to pump the fluid.

Warning: Check the transmission fluid level immediately after adding fluid and before vehicle operation. Do not overfill the transmission. An overfilled transmission may result in foaming or fluid to be expelled out the vent tube when the vehicle is operated, possibly causing a fire that may result in serious bodily injury or severe vehicle damage. Overfilling will result in possible damage to the transmission.

1. Check the fluid level. Refer to Transmission Fluid Level and Condition Check.

 

[Sly]

What do you mean by "T1's"?......So 150K for normal use, daily commuter 75%, and 25% hauling. Great info but all the "refer to" links don't work without a username and password?

Where did you find this information?

 

[Gangly]

T1 is the designation for our trucks (19-Present)
The information was gathered from AllData, an online subscription service that provides the OEM's service procedures, diagrams, parts, TSB's, Recalls, etc. Basically a software that gives non-OEM repair facilities access to OEM manuals, pocedures, etc. on a pay-to-play subscription plan.