Dif and Tcase fluid change
 

I have 8k on my truck and my guy shoed me the Dif fluid and its black, does not smell burnt but after some hard off roading I am wondering if I should go ahead and change? regular cycle is 15k right?

Re: Dif and Tcase fluid change
 

I think its much higher than 15k it was either 50k 0r 100k I forgot. I know it takes synthetic oil.

Re: Dif and Tcase fluid change
 

Probably could last a while longer, but I say change it. After 8000 miles of breaking in the gears and wheeling there's bound to be some grit in there.

So do you have to go with factory synthetic or can you use Mobil1?

Re: Dif and Tcase fluid change
 

I did my front and rear diff and the t-case at 8000 miles. The front diff was clean, the rear was nasty, and the t-case was a little dirty. I though thtat it was a good idea to change them.

The dealer wanted $700.00 to change all that AND they would check my levels and rotate the tires. What a deal! OR, you can do it yourself for 30 bucks. Just be sure to get a fluid pump ($5) and the synthetic oil for the rear. The transfer case requires to fill above the fill plug. Just cap it off when it gets to the plug and fill the rest of the amount from the sensor just above it. No big deal.

With all the heavy driving I do off road I am going to do the procedure every 10K or so.

Good luck,

Re: Dif and Tcase fluid change
 

Your statement on the t/case fill is partially correct for some vehicles, and incorrect of other vehicles.

For vehicles built prior and including 5GTDN136968105387, you just don't remove the sensor and fill to the sensor. You fill to the fill hole, as you described, and then remove the speed sensor and ADD ADDITIONAL 8.45 oz of fluid through the sensor hole.
If the vehicle was manufactured after the above VIN number, the additional fluid is not required.

In addition, the front diff also requires SAE 75W-90 Synthetic Axle Lubricant.

As to changing it prior to recommended specs, it's your money.:beerchug:

Re: Dif and Tcase fluid change
 

F5 my vin is 136668.
Do i need extra oil now or just when I change it?
Also recomended change would be at 50k is that correct?

Re: Dif and Tcase fluid change
 

Vehicles after 5GTDN136968105387 do not require the extra fluid, so with your VIN the extra fluid is not required. Recommended by GM is 50K using Dexron III.
You can verify this by looking at the bottom of the t/case. If there is a blue dot on the case, extra fluid is not required.

Re: Dif and Tcase fluid change
 

Vehicles after 5GTDN136968105387 do not require the extra fluid, so with your VIN the extra fluid is not required.


Isnt 136668111776 before 136968105387 :confused:
Im confused

Re: Dif and Tcase fluid change
 

I thought I was corn-fused as well.

My vin is DN136368... Jan 2006 build, 5-speed adventure/lux pkg.
So it's before the 136968, yes, ok, so extra fluid required right?

Go get under your t-case, here's what I found...
A blue line (like from a marking pen) not a dot. Also two printed labels. One idiot-proof label gives the detailed filling instructions in english and spanish including the part about adding additional .25L thru the speed sensor hole. The other label identifies the T-case: 449, 12/21/05, 14:14, 60 EV C012063.

So which thingee is the speed sensor? the one to the rear drivers side almost on top of the T-case?

?

Re: Dif and Tcase fluid change
 

mine was a June 05 build.
Maybe there only going by last 8 digits.?

Re: Dif and Tcase fluid change
 

120 from my guy and he uses the GM dex sheet. Ok I will wait a bit.:fdance:

Re: Dif and Tcase fluid change
 

Ok, I was referencing the last six digits of the VIN number, this is the sequence of the VIN number, the other digits stand for other things.

As for the fill, I was assured by engineering that the problem with the extra fill was fixed on vehicles built after the VIN, evidently it wasn't if there is a permanent sticker on the t/case stating to add more fluid via the speed sensor hole. MY MISTAKE. My APOLIGIES to Garnerbiker. Guess I can't believe everything I'm being told by certain people at GM.
Now I'm curious to see if they fixed this for 2007. Guess I'll have to crawl under a 2007, if we have one left in the center, and see for myself. This PEES me off, and the service manual is incorrect.
The procedure to fill the t/case in the service manual implies that the extra fluid is NOT required. So, if there is a sticker stating to add extra, then I have to notify someone that the service procedure is incorrect.
See, as I have stated many times, I learn from you guys and gals.


VIN BREAKDOWN for HUMMER H3 using 5GTDN136968105387:
5 - Country of Origin 1, 4 5 = USA)
G - Manufacturer (G = General Motors)
T - Division (R, T = Hummer)
D - GVWR/Brake System
N1 - Line Chassis/Series (Mid Size 4x4 SUV - 1/2 Ton - H3)
3 - Body Type (3 = Four Door Utility Truck)
6 - Engine Type (6 = L52, 3.5L L5, MFI)
9 - Check Digit (random)
6 = Model Year (6 = 2006)
8 = Manufacturing Plant (8 = Shreveport, LA)
105387 - Production Sequence Number

Re: Dif and Tcase fluid change
 

It's all clear as mud isn't it? :cool:

136968105387 (vehicles after this do not require extra fluid per f5fstop)
136668111776 (fourfourto's vin & f5fstop said does NOT require, June 05)
136368237108 (mine does require extra fluid per T-case sticker, Jan 06)

:confused:

Re: Dif and Tcase fluid change
 

I thought it was clear for a second.?
How can Hal have a sticker if hes after that # ?:confused:

Re: Dif and Tcase fluid change
 

f5fstop, I just now saw your last post....

maybe someone does knows that the manual is wrong and hence the idoit proof sticker on my T-case.
Anyway thanks for checking on this. We all value your expertice more than you know!
:clapping:

Re: Dif and Tcase fluid change
 

f5fstop,

Thanks for getting the extra fluid info striaght. That is what I did when I filled it up.

Was adding the extra fluid an afterthought by GM, or could they not get the fill plug up higher?

G

Re: Dif and Tcase fluid change
 

Maybe I'm adding confusion to this subject.:dancingbanana:

Apparently, I was informed wrong when the dealer upgrade bulletin was issued, that the additional fluid would not be required on vehicles after the VIN I posted. It appears the additional fluid is required, but rather than issue a bulletin, there is a note added to the t/case informing the tech to add the additional fluid.
So, it appears that all t/cases, at least in 2006, require the extra fluid. I will check on this tomorrow with engineering.

HAL: As for the manual, the electronic manual I access online is updated daily with new or revised information. For the engineer to update the information is very easy, put in a request, and a day or two later it is available to the dealers via the GM electronic service information website.
If I find out tomorrow that all cases required the extra fluid, I will notify the people in charge of service manuals and have them make the change to the fill procedure.

Re: Dif and Tcase fluid change
 

Thanks f5fstop

A good reason not to get it done a quickie oil change place. Not to mention any names..

Re: Dif and Tcase fluid change
 

ok I think i get it.:confused:

Re: Dif and Tcase fluid change
 

Follow your owners manual...:fdance: