Dif and Tcase fluid change

[usetosellhummer]

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?

[fourfourto]

Originally Posted by usetosellhummer

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?

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

[Wisha Haddan H3]

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?

[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?