Please help

[Bgtmfsher77]

I posted this up on the other duramax forum but I'm really having a rough time here so I figured I would try here as well. I changed the tranny and tcase fluids in my 03 duramax. After Filling up the tcase through the speed sensor hole ( I was told this was a good idea) my truck went into limp mode and the service brake light went on as well as the abs. I drained the tcase and filled it up through the fill hole and limp mode and all lights went off. Now when driving it shifts normal until downshifting into 2nd where it clunks briefly and almost acts like something's grabbing. The brake pedal will vibrate as well. Any ideas guys?

 

[S Phinney]

Sounds like you may have a problem with that speed sensor.

 

[Bgtmfsher77]

I changed the actual sensor. Is there something I could have done by filling it up through that hole as far as inside the tcase

 

[Mike L.]

Are you listening to the people on duramax Forum?

 

[Combine Pilot]

Are you listening to the people on duramax Forum?

:cop:

 

[Bgtmfsher77]

Well lol....I haven't gotten any help yet from them. At this point I'm taking whatever help I can get as I'm stumped

 

[Mike L.]

:cop:

You've seen some of the answers over there.

 

[OregonDMAX]

I changed the actual sensor. Is there something I could have done by filling it up through that hole as far as inside the tcase

What did you fill it with and did you fill it all the way to the very top :spit:

Most everyone over there are misinformed.

 

[Bgtmfsher77]

I originally filled it with just under 3 qts of transynd. After I had the problem I have now just filled it up to the fill hole with auto trak II

 

[Hot COCOAL]

I've read about using straight 30w or even 5-30 oil in the T-case, but never trans fluid...

 

[OregonDMAX]

I originally filled it with just under 3 qts of transynd. After I had the problem I have now just filled it up to the fill hole with auto trak II

DO NOT use autotrak II in the HD model trucks, that is for the half tons and smaller that have auto transfer cases.

2 quarts Dex 3 is factory, the other method, although controversial is 3 quarts mobil1 5w/30 through the speed sensor hole

I've read about using straight 30w or even 5-30 oil in the T-case, but never trans fluid...

They come factory with 2 quarts of dex 3 :thumb:

 

[Hot COCOAL]

DO NOT use autotrak II in the HD model trucks, that is for the half tons and smaller that have auto transfer cases.

2 quarts Dex 3 is factory, the other method, although controversial is 3 quarts mobil1 5w/30 through the speed sensor hole



They come factory with 2 quarts of dex 3 :thumb:

Well that's just messed up...
My local chevy dealer sold me AutoTrakII for the T-case of my 2500HD
:baby:

 

[OregonDMAX]

Well that's just messed up...
My local chevy dealer sold me AutoTrakII for the T-case of my 2500HD
:baby:

Because the owners manuals in a lot of trucks say that too bit its definitely without a doubt a typo. The auto trak II is for the tcases with the clutches like your TBSS probably has.

 

[Mike L.]

I don't think the Auto Trac will hurt anything. I've seen many Duramaxes come through my shop with high mileage and no damage.

 

[S Phinney]

I have ran autotrak II for 260k miles and have zero problems. 80k has been at high HP too.

 

[Mike L.]

I believe the auto Trac fluid has a release agent to assist clutch release. I think that is the only difference.

 

[OregonDMAX]

So it might be OK. I was just stating that it was not the correct fluid per factory recommendation. Just like the 5\30 it works great but its not factory.

 

[Mike L.]

So it might be OK. I was just stating that it was not the correct fluid per factory recommendation. Just like the 5\30 it works great but its not factory.

Agreed.