Dif and Tcase fluid change

[garnerbiker]

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,

[f5fstop]

Originally Posted by garnerbiker

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.

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.

[fourfourto]

Originally Posted by f5fstop

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.

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?

[f5fstop]

Originally Posted by fourfourto

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?

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.

[fourfourto]

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


Isnt 136668111776 before 136968105387
Im confused

[Hal]

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?

?

[fourfourto]

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

[Hal]

Originally Posted by fourfourto

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


Isnt 136668111776 before 136968105387
Im confused

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

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)

[fourfourto]

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

[Hal]

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!