Questions on recommended service at 80k miles?

[Hills]

Hello,

I bought my rig at 74k miles a few months back. I have been out and about a lot this summer camping and such! Just hit 80k miles. I was thinking of having all of my fluids flushed, replacing the thermostat, maybe changing out some of the hoses, doing brake and power steering fluid, also not sure if the truck has a tranny filter, but doing that as well?

What else should I get done?

 

[f5moab]

Won't hurt to do them all. Auto tranny has a filter; not sure what you have.
Just follow the recommended fluids in the owner's manual.
I always prefer a trans flush, but others will say a drain is better; however, with a drain and filter change you leave about 60 percent of the old fluid in the trans/torque converter, lines and cooler. Guess the best would be replace filter than flush.

 

[Hills]

Won't hurt to do them all. Auto tranny has a filter; not sure what you have.
Just follow the recommended fluids in the owner's manual.
I always prefer a trans flush, but others will say a drain is better; however, with a drain and filter change you leave about 60 percent of the old fluid in the trans/torque converter, lines and cooler. Guess the best would be replace filter than flush.

Okay! Awesome! I will get it done.

Do you know of anything else I should do? This is my first time owning a Hummer. Previously I had a 93 cherokee, and a 2001 exploder. Not sure if there are any other necessary things?

 

[f5moab]

Do the diffs too. There is not recommended service for the front/rear diffs, but they should be done sometime between 80-100K if not off-roaded. If it is off-roaded at least by 50K (I did mine at 30K). The recommended fluid is fully synthetic, and I used Mobil 1. Just make sure to remove the fill plug before pulling the drain plug.

As for the t/case....what year vehicle do you have? If you have a mid-year 07 and later, not problem, drain it and fill it at the fill plug. If mid-year 07 and earlier, it gets a bit more complicated.

As for PS and Brake flushing...I have heard pros and cons, and can only say from GM's perspective when I worked there, it was not necessary. Personally, at 100K I might do a flush of the brake lines just for giggles. The PS gear usually does not last that long, so it is usually changed when the steering gear fails.:giggle:

 

[Hills]

Do the diffs too. There is not recommended service for the front/rear diffs, but they should be done sometime between 80-100K if not off-roaded. If it is off-roaded at least by 50K (I did mine at 30K). The recommended fluid is fully synthetic, and I used Mobil 1. Just make sure to remove the fill plug before pulling the drain plug.

As for the t/case....what year vehicle do you have? If you have a mid-year 07 and later, not problem, drain it and fill it at the fill plug. If mid-year 07 and earlier, it gets a bit more complicated.

As for PS and Brake flushing...I have heard pros and cons, and can only say from GM's perspective when I worked there, it was not necessary. Personally, at 100K I might do a flush of the brake lines just for giggles. The PS gear usually does not last that long, so it is usually changed when the steering gear fails.:giggle:

Awesome! I will get that stuff done!

I looked at my vin tag. In the upper right hand corner it says 10/06 so I have an 07 that was manufactured in late 06.

 

[Spectre]

Good thread. I'm in the same boat. Got my truck at 73k and not sure how well it was taken care of before.

I also noticed some rather important looking lines that are rusting through. Just be sure you look out for anything else that may need to be replaced or updated in addition to the standard maintenance items.

Sent from my SCH-I535 using Tapatalk 4

 

[f5moab]

All early 2006 H3s were shipped with the t/case fluid low. Dealer was SUPPOSED (when I picked up my early 06, the dealer had not even read the bulletin, so I say SUPPOSED to) to check fluid level, then add x-amount of fluid through the VSS hole. Then after a certain time, vehicles were shipped with a green dot, signifying that the t/case had been shipped with the correct amount of fluid. Then in mid-2007, the t/case was slightly changed and the correct amount of fluid was added. (Basically, the early t/cases had an incorrect angle to the fluid level. GM found this out because the forks were destroying themselves, especially if the vehicle was ever used in 4x4 low).

Here is information on filling a t/case....
Remove the drain plug and allow the t/case to drain.
After draining fluid, install pipe sealant to the drain plug and torque to 18 lb ft or 25 N.m.
Remove the t/case fill plug, and fill to bottom of fill plug hole:
​for all 2006 Model Year Vehicles and for 2007 model year vehicles if the VIN is 56TDN13E778100102 or prior:
Remove the speed sensor connector (top rear of t/case), then remove the speed sensor.
Add 250 ml (8.45 oz) of manual transmission and transfer case fluid through the speed sensor hole.
Install the speed sensor and tighten to 13 lb ft or 17 N·m. Then install the speed sensor connector to the speed sensor.
This additional fluid is needed.

Adding fluid into the speed sensor hole is not required for 2007 vehicles built after 56TDN13E778100102 or 2008 vehicles.

 

[poncho1965]

I wonder if mine had the green dot. I had a sticker on it saying to add the extra fluid so I would assume it was done, but yet it toasted itself.


Mike

 

[f5moab]

Green dot was used to signify to the dealer that the factory added the extra fluid. Many reasons a t/case could fail. Early t/cases had the plastic shift forks too. But a plastic shift fork itself did not mean a t/case would always fail.

 

[jphh20]

What type of fluid goes into the 2006 T cases? Is this a dealer only item?

 

[alrock]

Hmm, lots of (heated) discussions regarding the t-case fluid. I believe the Owner's Manual says Manual Transmission Fluid while later GM Service Manuals say Dexron VI. You will not get a consensus here on what to put in - listen (or read) the arguments for each and make your own decision.

Transmission drain and fill - definitely get the filter as it's a piece of cake to install and it comes with a new pan gasket. My gasket was as hard as a rock and came off in pieces. I wouldn't have been able to drive my truck without that replacement gasket.

I'm trying to keep an 50,000 mile schedule service on transmission, diffs, t-case. That's more aggressive than the owner's manual but I do keep my truck in the AZ heat and it sees offroad action, meaning more dirt entering into the systems. I have never changed the brake fluid in 130,000 miles but during brake work they've been bled intermittently enough that most of the fluild has been changed, including one accidental near draining of the system (thanks Crawler :wink. Like F5, I last changed my PS fluid with a pump change, but that's probably about 80,000 miles ago.

 

[f5moab]

From the latest electronic GM service manual DVD:
For the T/case
DEXRON®VI GM P/N 88861003 (Canadian P/N 88861004)
1.5 liters
1.6 quarts

Form my 08 Owner's manual:
Transfer Case DEXRON®-VI Automatic

And, mine was flushed twice by the dealer and they used Dexron VI for both flushes and fills.

06 and some 07 owner's manuals were produced prior to the release of Dexron VI and there was a period of time when GM would not recommend dexron vi in the t/case due to no approval from Borg Warner. After BW tested Dexron VI, they finally gave approval for the use of Dexron VI. That's one reason why there is confusion.

 

[bendyprissy]

Mine now has 83K so looks like I've got some work to do. Wish I knew how to do it myself because with me working nights I have all this time during the day to do all this but when I ask hubby to show me how or let me do it he says absolutely not, you just sit there and look pretty (ya right, maybe 10 years ago) cause I don't want you messing something up. So looks like I'm waiting for him, darn it. There really needs to be more girls on here because they would completely get this little rant I went off on.

 

[poncho1965]

It's easy enough to do, sorry I did not do mine sooner and I am only at 41k miles on my '06. My full skid makes it a pain, but when it comes off in the winter I think I will start changing fluids alot more regularly. Learned my lesson!


Mike