fluid swap

hey guys i posted earlier on what fluid to put in my transfer case i got some good input theonly problem im having is that i dont know what transfer case i have in my 02 4x4 blazer as it has been replaced anyway i can tell looks like there was some kind of sticker on it at one point but its gone im trying to determine wether to use autotrackII or dex i want to change the fluid in my transfer and diffs before snow hits i know my diffs take 80w90 gear oil i just dont know what to use in my transfer it has dex in it now but id like to have whats best for my truck as ive had the whole drivetrain except the front dif replaced new transfer case, transmission and rear dif any info would be great like i said i dont know what transfercase i have as it has been replaced how can i find out wich one i have
thanks
Dave

hey guys i posted earlier on what fluid to put in my transfer case i got some good input theonly problem im having is that i dont know what transfer case i have in my 02 4x4 blazer as it has been replaced anyway i can tell looks like there was some kind of sticker on it at one point but its gone im trying to determine wether to use autotrackII or dex i want to change the fluid in my transfer and diffs before snow hits i know my diffs take 80w90 gear oil i just dont know what to use in my transfer it has dex in it now but id like to have whats best for my truck as ive had the whole drivetrain except the front dif replaced new transfer case, transmission and rear dif any info would be great like i said i dont know what transfercase i have as it has been replaced how can i find out wich one i have
thanks
Dave

Id tag is on back of transfer case.

Does it have the auto 4W button on dash or just reg 4W?

Id tag is on back of transfer case.

Does it have the auto 4W button on dash or just reg 4W?

hey mt thanx for responding well i did see a spot on there where there used to be a tag but its gone is there some other numbers on it anywhere i have on my dash 4 low 4 hi 2 hi if it helps i aprecitate any info just tryin to get the new fluids in before snow hits

hey mt thanx for responding well i did see a spot on there where there used to be a tag but its gone is there some other numbers on it anywhere i have on my dash 4 low 4 hi 2 hi if it helps i aprecitate any info just tryin to get the new fluids in before snow hits

With no Auto 4W button you have a 233.
They call for DEX111 wich is no longer being made.
Dexron/mercon can be found at Carquest.

To be sure Check with your gm dealer for replacement fluid.

With no Auto 4W button you have a 233.
They call for DEX111 wich is no longer being made.
Dexron/mercon can be found at Carquest.

To be sure Check with your gm dealer for replacement fluid.
thanks for you input just onemore question is there any harm in putting autotrackII in it if itdoesnt require it i know its been said that i cant use synthetic gear oil in my difs due to all the limited slip crap just curious

thanks for you input just onemore question is there any harm in putting autotrackII in it if itdoesnt require it i know its been said that i cant use synthetic gear oil in my difs due to all the limited slip crap just curious

If it does not call for it do not use it.

Check with your GM parts dealer for the lastest fluid replacement.

Hey guys, I'm thinking of changing my transfer case fluid in the next few days. Is it difficult? I've never really messed with a TC before. Does it drain through a plug like your motor oil?

Hey guys, I'm thinking of changing my transfer case fluid in the next few days. Is it difficult? I've never really messed with a TC before. Does it drain through a plug like your motor oil?

Transfer case have a lower drain plug for draining amd a upper plug for filling and checking fluid level.But make sure you use the right fluid called for on your transfer case.

The newer auto 4W transfer case uses special GM fluid and some call for a flush when changing.
Drain and fill and drive and then drain and refill again.
Post back what transfer case you have and year and truck you have.

Thanks MT. I just crawled in there and it has a tag that says 233. I think I saw the bolts, are they allen wrench type bolts? Btw truck is a 98 Blazer 4x4 LT vin code W. I tried to see if it mentioned anything about what fluid to use. Should I use the one you mentioned earlier in this thread?

Thanks MT. I just crawled in there and it has a tag that says 233. I think I saw the bolts, are they allen wrench type bolts? Btw truck is a 98 Blazer 4x4 LT vin code W. I tried to see if it mentioned anything about what fluid to use. Should I use the one you mentioned earlier in this thread?
Check with your gm parts dealer they may have a GM transmission manual gear fluid for it.
Do not use the GM new dex 6 fluid in manual gear boxes.
For dexron 111 applacations I have been using the carquest mercon/dexron treansmission fluid.