Jump to content

2024 10-Speed Transmission Service

ssgballistics

By ssgballistics
in 6.6L Gas V8 (L8T)

 Share

Recommended Posts

ssgballistics Enthusiast

ssgballistics

Posted
Posted

Has anyone serviced the transmission in their 24’ gasser? I’m going to be dropping the pan and replacing the filter and fluid in the next couple of weeks. I am under the impression the service should be very similar to that of Duramax trucks. Do you have to drop the exhaust to remove the pan? How much fluid does it take (I ordered 10 qts)? I would appreciate any information from someone who has done this. 

  • Replies 30
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

newdude
newdude

Pan drop takes just over 14 quarts.  Dexron ULV fluid, p/n 19352619.         That is not "technically" a drain plug.  That is the fluid level check plug for checking the lev

bruceb58
bruceb58

It may be possible. I was just stating what the manual says. Yes...I have looked the very first day I brought my truck home 5 months ago.   I will try first without moving the exhaust. If it

bruceb58
bruceb58

By queued up, I am assuming you haven't bought it yet.   Consider doing something like this instead o drain plug like the Superior. I do MIG and TIG welding and I would go with something lik

Posted Images

bruceb58 Enthusiast

bruceb58

Posted
Posted

I haven't done it yet but I do know you need to drop the exhaust according to the service manual.

 

When I drop my pan, I will be putting in an after market pan that has a drain plug.

64BAwagon Senior Enthusiast

64BAwagon

Posted
Posted

I think you may be able to sneak the pan out without dropping the exhaust. It may need some prying to get it cleared or loosening of the trans mounts and prying up. I consider this an epic fail and a sure sign that Allison didnt have a huge role in this design since they have a history of building transmissions that are service friendly.

Mines good for now but I already have a Superior products drain plug setup thats going on it when I do. 

I dont have an exact count on the qts needed but I would buy a few extra just in case. 

When refilling the trans I will use the M18 nipple that I bought with the hose and run that up to the normal dipstick area rather than pumping into the side of the case. I believe I posted about the setup before. SInce I know mine is at the correct fill I will just measure the amount I drain and replace that accounting for the inevitable spillage. 

Just for grins, I got back from a trip towing my 12,500# fifth wheel in 85 degree temps and my trans never went over 176 degrees with a mic of freeway and stop and go city in the 200 miles. 

  • Like 1
lineman1234 Enthusiast

lineman1234

Posted
Posted

Maybe its a simple regular cab thing...........  But........... 

 

I just looked under my 2024 regular cab, 6.6 gasser, 3500 4x4. The transmission drain plug is in the front  drivers side of the pan. It wont drain all of it as there is a drop down part. Then the pan can removed very easy without doing anything with the exhaust. Yes, it has to be slid forward of the exhaust then it will come right out, and go back in. 

 

Ill will attempt, to do some fluid sucking to get the rest out of the deeper part of the pan to help with less sloshing. 

 

For the others/normal people with a 4 door. Maybe someone could confirm or post that the exhaust needs to be dropped or not. 

lineman1234 Enthusiast

lineman1234

Posted
Posted

(( 64BAwagon )) You posted  right before i hit submit. Did you confirm by looking under for the 4 door people? or i can look when my friend gets back from camping next week and add to the 4 door being like my 2 door or it being a pain. He has a gmc 4 door.

lineman1234 Enthusiast

lineman1234

Posted
Posted

Has anyone looked into if the transmission pan has a reusable gasket or is it like my past 2015 ram diesel with a pan that had, no, drain plug and the pan gasket was not reusable.  

Capt Bob Enthusiast

Capt Bob

Posted
Posted
2 hours ago, lineman1234 said:

Maybe its a simple regular cab thing...........  But........... 

 

I just looked under my 2024 regular cab, 6.6 gasser, 3500 4x4. The transmission drain plug is in the front  drivers side of the pan. 

 

 

I may be mistaken but I believe that plug is used to check the level of fluid in the tranny. The correct level is obtained (while at operating temp) when fluid is reduced to a slow drain. It is not to be confused as an actual drain plug for emptying the pan.

  • Like 1
johnnyquick Enthusiast

johnnyquick

Posted
Posted
8 hours ago, bruceb58 said:

I haven't done it yet but I do know you need to drop the exhaust according to the service manual.

 

When I drop my pan, I will be putting in an after market pan that has a drain plug.

what pan are you looking at?

newdude Senior Enthusiast

newdude

Posted
Posted
On 8/24/2024 at 5:26 PM, ssgballistics said:

Has anyone serviced the transmission in their 24’ gasser? I’m going to be dropping the pan and replacing the filter and fluid in the next couple of weeks. I am under the impression the service should be very similar to that of Duramax trucks. Do you have to drop the exhaust to remove the pan? How much fluid does it take (I ordered 10 qts)? I would appreciate any information from someone who has done this. 

 

 

Pan drop takes just over 14 quarts.  Dexron ULV fluid, p/n 19352619.

 

 

6 hours ago, lineman1234 said:

Maybe its a simple regular cab thing...........  But........... 

 

I just looked under my 2024 regular cab, 6.6 gasser, 3500 4x4. The transmission drain plug is in the front  drivers side of the pan. It wont drain all of it as there is a drop down part. Then the pan can removed very easy without doing anything with the exhaust. Yes, it has to be slid forward of the exhaust then it will come right out, and go back in. 

 

Ill will attempt, to do some fluid sucking to get the rest out of the deeper part of the pan to help with less sloshing. 

 

For the others/normal people with a 4 door. Maybe someone could confirm or post that the exhaust needs to be dropped or not. 

 

 

That is not "technically" a drain plug.  That is the fluid level check plug for checking the level.  

 

 

5 hours ago, lineman1234 said:

Has anyone looked into if the transmission pan has a reusable gasket or is it like my past 2015 ram diesel with a pan that had, no, drain plug and the pan gasket was not reusable.  

 

 

Should be, most all the ones GM uses are these days.  

  • Like 2
newdude Senior Enthusiast

newdude

Posted
Posted
2 hours ago, lineman1234 said:

I like to learn things.......

 

And i thought it was a drain plug. 

20240901_093129.jpg

20240901_093208.jpg

 

 

I mean...yes you "can" drain a fair amount out of there but obviously you won't empty the pan.  There's a stem pipe that it screws into, it will drain fluid to a point at or just below the stem pipe, so the pan itself will still be pretty fluid loaded.  

ssgballistics Enthusiast

ssgballistics

Posted
  • Author
Posted

I appreciate everyone’s feedback. I ordered additional DEXRON ULV for the job. I’ll try to come back here with a detailed post of my experience. I’m sure someone else will be looking for this info in the future. 

  • 3 weeks later...
bruceb58 Enthusiast

bruceb58

Posted
Posted
On 9/1/2024 at 7:52 AM, lineman1234 said:

I like to learn things.......

 

And i thought it was a drain plug. 

 

 

It's a fill level! If the transmission was properly filled, nothing will come out of it.

Another JR Senior Enthusiast

Another JR

Posted
Posted
4 hours ago, bruceb58 said:

It's a fill level! If the transmission was properly filled, nothing will come out of it.

Level when shut down and level when running are different. 

  • Like 1

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,759
    Total Members
    8,960
    Most Online
    DM22
    Newest Member
    DM22
    Joined

  • Who's Online   0 Members, 0 Anonymous, 2,351 Guests (See full list)

    • There are no registered users currently online

  • Latest Articles

  • Posts

    • B14Sierra
      Cam chain tensioner question

      By B14Sierra · Posted

      So I'm in the middle of a DOD AFM delete on my 6.2 L86 Sierra. I had a pick holding the tensioner but after I got the Cam phaser gear off I was cleaning off all the rtv and apparently I didn't have the pick seated far enough in. I bumped it and the tensioner sprang forward.  I think everything is good but I want a second opinion. The top of the tensioner is just a looped piece of plastic that rides in that channel right? There is no spring or anything is there? I got the gear and chain back on and it seems tight and everything looks right. I'm hoping nothing fell out.
    • dna9656
      No low range 4 x 4

      By dna9656 · Posted

      My 2015 1500 LTZ Silverado suddenly won't go into 4 x 4 low. It will go into 4 x 4 high.
    • asilverblazer
      Transmission Woes :-(

      By asilverblazer · Posted

      Yep, just a quick reference point.    My main point being I’d do a thousand other things before I’d pay 10k for a transmission.    Speaking in ignorance cause I don’t look at these trucks, what is it worth? 20k?
    • asilverblazer
      Intermittent no-code issues on 2022.5+ V8 trucks — what did the shop fail to capture?

      By asilverblazer · Posted

      I think users are going to want to pick their monitored parameters, which parameters they want to see first.    It should probably start with baseline at a minimum and adjust to learned, but be able to overlay baseline for comparison.   A simple severity level would be able to determine what type of alerting is appropriate or user selectable.    Why not use the OBD port though?   I think a phone connection would be a good idea, push notifications type deal.   Number 1 issue is having data is useless if you don’t know what the data should be under normal conditions. 
    • Chuck FB
      summer road trips in the 2026 2500HD

      By Chuck FB · Posted

      I thought I would use your thread and add to it as I just did my first longer drive with my truck in the last couple of days. I drove from the Grande Prairie area of Alberta down to Edmonton and most of where I drove in the city was the ring road so fairly free flowing but a bit of stop and go as well in the city. Stayed the night and returned home and not too many stops along the way each way but every restart and certainly every cold start sets it back for fuel mileage. Why I say that is I see some people will cherry pick a fuel mileage leg after the vehicle had been warmed up driveline wise before hand and its a forgiving ( easy rolling drive leg for example ) and call that their fuel mileage which can give a false perception of reality. I was not heavily loaded at all but never the less the flip bak cover, rubber bed mat, various tools etc and extra jerry cans of fuel all way up to a few hundred pounds of dead weight so its not an empty truck. The cold inflation tire pressures are set more near the freezing point so once they are warmed up driving I was showing 45 front and over 40 rear and realize high inflation pressures would help a little in fuel mileage but certainly not the ride on our crap sections of highway. The weather was good so was not raining as that can really drag mileage down, in fact I had a bit of a tail wind on average driving home. Most people on here would never have driven on that freeway to visualize it but its got a fair bit of rolling type of landscape with numerous river valleys. For the most part I had it on cruise set to 62 although kicking it off if I caught it in time before it started down shifting and self braking going down the grades. Most of the more substantial grades its shifting into 7th I believe as 8th just doesn't have it. Total distance round trip was 643 miles and my overall average and I did refuel three times in all, figured out to 17.65 miles per US gallon. My best fuel mileage section refuel within all of this figured out to 18.46 and these are all hand calculated figures. I find if anything that the trucks computer can be over optimistic, sometimes its pretty close but other times its stretching it. On paper persay in theory the truck would have just about made it on fumes for that whole drive without refueling once.    Which made me think of the topic thread of the wonder if these trucks could do 20 mpg and that is a good question, certainly would have to be on an easy going flat highway, no head wind, the right temperature, not packing around a bunch of dead weight and puttering along even slower than I was I would suspect and going steady and not stopping to smell the flowers or take a piss !. It probably is possible but not without effort to attain that with the wind resistance and weight of these trucks. Of course on my drive most people are passing me if they have the power as per loaded highway tractors, never mind a lot of speedy vehicles but the speed limit is 68 and most are at or well over that. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...