Jump to content

Loud Noises Coming From Transfer Case


Recommended Posts

Hey Guys,

I've got 03 gmc sierra with a 4L60e - 246 - m30 transfer case. It suddenly started making horrible noise in all gears but 3rd. The tone changes as the gears change. Transmission acts as if it shifts fine and not slipping. With truck on rack when wheels turn the noise is definately coming from the last couple inches of the transmission and the 1st several inches of the transfer case. The noise sounds like a grinding noise. Anyone have any clues? It's going to be Monday before it can be checked out at the earliest. No metal flakes in tranny fluid but transfer case looks like it has some stuff in the oil. Any help with this guys?

 

Thanks,

 

UPDATE:

Just drained transfer case fluid and it's black as West Virginia Coal. I had just changed it about 5-8000 miles ago with the correct bright blue fluid from GM. Sounds like it has let go.

Link to comment
Share on other sites

update 2

changed the fluid again just to see what it did and it made the noises worse. Is there a clutch pack or something that would cause this? Sounds like new transfer case would be the best bet because mine has also suffered from the little wear holes from the dogs on the shaft in the case.

Link to comment
Share on other sites

  • 2 weeks later...
If the noise is coming from all gear but 3rd, it's probably not a transfer case issue. The transfer case is always in motion, even in 2wd. It has to be something in the transmission. (I think)

 

Put a new transfer case in because old one had a couple pin holes in it and the oil was full of metalic after only about 5000 miles. Put it back together and it seemed all the noise was gone for a bit.

 

Drove it this morning and boom the overdrive went out or started grabbing, then 1st and 2nd gear started whinning. No reverse now and won't go into park. Transmission is shot and for no reason.

Link to comment
Share on other sites

If the noise is coming from all gear but 3rd, it's probably not a transfer case issue. The transfer case is always in motion, even in 2wd. It has to be something in the transmission. (I think)

 

Put a new transfer case in because old one had a couple pin holes in it and the oil was full of metalic after only about 5000 miles. Put it back together and it seemed all the noise was gone for a bit.

 

Drove it this morning and boom the overdrive went out or started grabbing, then 1st and 2nd gear started whinning. No reverse now and won't go into park. Transmission is shot and for no reason.

 

 

There's definitely a reason, there always is. Unless you have access to cheap, used parts, the problem you described would be best evaluated by removing both the transmission and the transfer case and inspecting. One failed before the other, causing the other to go shortly thereafter. Either way, both have to be evaluated at the same time when a hard part fails at the output end of the transmission.

Link to comment
Share on other sites

I ordered a new tranny yesterday. The planitary gears is what tore up in the transmission. At least now I'll have a whole new drivetrain other than the engine. Hopefully I don't have any problems there. 5.3s seem to be good for many miles.

Link to comment
Share on other sites

  • 2 weeks later...

got my new transmission installed today. I had a level 3 stage 2 shift built at mad dog transmissions. Dynoed for up to 700hp. Now when I run across a few grand extra it will be time for a supercharger or something to put the new drivetrain to use.

Link to comment
Share on other sites

Sounds like a plan to me :rolleyes: As bad as it is to have a transmission go out on you, it gave the opportunity for an upgrade.

 

Yeah I hated that it happened but it should be bullet proof now. I put my 93 oct tune back in today. I'll be working on dialing it back in to this tranny and I'm thinking about some long tube headers to go with it all.

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.



×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.