Hey i changed all the oils, plus fix the chattering problem!

Hello people,
Not posting a question this time haha.

i drive a 2000 bravada with about 74500 miles on it with no fluid change what-so-ever which explains why the gear oil that drained out was black, no joke. And the transfer case fluid was blu-ish black

Just happy that i change all the oils in my car today, and fix that chattering problem. Changing the transfer case fluid once stopped the chattering. Now making u-turns or tight turns the front end of the truck doesn't feel like its hopping and is not making that grinding/growling noise.

p.s Have a great day every day!
And heres what i learned.
1) 3 Quarts of gear oil is a little more than enuff for both front and rear diff. And 3 quarts of AutoTrak II is more than enuff.
2)The rear diiff screw is on side of the diff.(passenger side), also found out that a hex key CANNOT unscrew the bolt, just use a rachet with an extension, perfect fit. Its a square bolt, not hex.
3)Nappa sells a suction pump for 11.99 while autozone sell for 7.99.
4) Still can't remember which way to turn the bolt to loosen bolt
5) IF not using a jackstand, stretch for at least 15 min before crawling under the car, the bolts are tight and can def easily pull a muscle.
6) After the rear diff finish draining there is still a few more ounces in the diff. that didn't drain out, use the suction pump and get it out.

Good Job foon, Thanks for the Update.

Good job buddy. thanks for the input and comments

Nice!

I hope you used transmission fluid in the transfer case.

BlazerLT, You run all synthetic fluid correct?

Yes, but not right at the moment seeing I am still doing the Auto-RX rinsing cycle for 3000 miles.

Then I will be back to synthetic permanently.

1) 3 Quarts of gear oil is a little more than enuff for both front and rear diff. And 3 quarts of AutoTrak II is more than enuff.


It sounds like he used Autotrack II for his transfer case which is correct (not automatic transmission fluid).

Yes, but not right at the moment seeing I am still doing the Auto-RX rinsing cycle for 3000 miles.

Then I will be back to synthetic permanently.
But aren't you running all synthetic fluid as in tranny fluid and everything else?

It sounds like he used Autotrack II for his transfer case which is correct (not automatic transmission fluid).

Just checked, yes, they can both be used although I would use ATF seeing it is cheaper.

But aren't you running all synthetic fluid as in tranny fluid and everything else?

Due to financial constraints, I can't switch them right now. I just had the diffs and the transfer case changed a little over a year and a half ago and the fluid is practically still new in them.

The transmission fluid was also changed but I could not afford the synthetic upgrade at the moment.

Due to financial constraints, I can't switch them right now. I just had the diffs and the transfer case changed a little over a year and a half ago and the fluid is practically still new in them.

The transmission fluid was also changed but I could not afford the synthetic upgrade at the moment.
What kind of gain might be seen form that?

Fro the fluids, you might not see any improvement to slight improvement in warmer climates but where you will see a 2-3mpg difference is in the colder climates where temps drop less than freezing and lower.

Cool thanks. Might be something to do for a future venture

It sounds like he used Autotrack II for his transfer case which is correct (not automatic transmission fluid).
Yep, ATF would have destroyed his transfer case.

Just checked, yes, they can both be used although I would use ATF seeing it is cheaper.

ATF won't be cheaper in a Bravada after you've smoked the transfer case out of it....

Just saw that blazee said the same thing - missed chcknuggets post. Sorry...

ATF won't be cheaper in a Bravada after you've smoked the transfer case out of it....

You can use either one, go ask a dealer.

Mine uses ATF and I haven't "smoked it".

How many times have we talked about the ATF going from the transmission into the transfer case because of a bad seal?

ATF can be used in this application as well. Go check your service manual if you think I am wrong.

I checked my service manual, I have a 99 Bravada. I've changed my transfer case fluid twice since I've had it (almost 100,000 miles). I'll spend $20 on the Autotrak fluid personally. Bravada's have all wheel drive and a viscuous clutch transfer case that your Blazer doesn't have. I agree that you can use ATF in blazers, but not in a Bravada or any other GM AWD transfer case.

Bravada's have all wheel drive and a viscuous clutch transfer case that your Blazer doesn't have. I agree that you can use ATF in blazers, but not in a Bravada or any other GM AWD transfer case.

Quoted for truth. GM as issued a lot of TSBs stating to use AutoTrac II and not ATF in AWDs, because ATF will damage the transfer case.

I checked my service manual, I have a 99 Bravada. I've changed my transfer case fluid twice since I've had it (almost 100,000 miles). I'll spend $20 on the Autotrak fluid personally. Bravada's have all wheel drive and a viscuous clutch transfer case that your Blazer doesn't have. I agree that you can use ATF in blazers, but not in a Bravada or any other GM AWD transfer case.

Oh I see, seeing this was posted in the Blazer section I was assuming that is what he had.

Oh I see, seeing this was posted in the Blazer section I was assuming that is what he had.
BlazerLT, out of anyone on this forum you should know what happens when you ASS-U-ME something! haha just playing :rofl:

BlazerLT, out of anyone on this forum you should know what happens when you ASS-U-ME something! haha just playing :rofl:

Hey now.

Gotcha!

Sorry for the mix-up my fellow blazerians, i just got too excited and decided to post in this forum too, since everybody here helped me so much. After changing the gear ols and motor oil i gained 1 MPG!!! then it dropped .1 mpg haha. so my MPG as of now is 14.9 says the display

Sorry for the mix-up my fellow blazerians, i just got too excited and decided to post in this forum too, since everybody here helped me so much. After changing the gear ols and motor oil i gained 1 MPG!!! then it dropped .1 mpg haha. so my MPG as of now is 14.9 says the display

Don't go by the display, you do it the manual way.

gallons used/miles driven

Don't go by the display, you do it the manual way.

gallons used/miles driven
I agree. My display says 16.9mpg when I do the math it says usually anywhere between 20-23mpg. Want to really save on gas mileage? Use your cruise control as much as you can. I have noticed a good gain from that. I know it is common knowledge but thought I would mention it. Happy Trucking

Very true.

i was told by my dealer parts guy that if u have auto 4 wheel drive u should use autotrak if not use atf.

They are interchangeable on the 4x4 systems.

AWD I just learned is AutoTrak only.