98 Tahoe 4l60

[nashranch]

The other day I went to visit old friend who lives up real steep cat road 1/2 way up this hillside. I always put it in 4 wheel high . There are switch backs so you can't really go that fast. Any way was climbing and was losing power so I manually shifted it into 2nd and it wouldn't go. Felt like it was slipping so I shifted back to drive to continue on. Do I have have clutch band problems in the future. It does go ok on flat ground

 

[Fless]

Move you here from Site News. Please be careful when selecting the forum section for your post, for the best responses.

 

[strutaeng]

Umm, sounds like it could be slipping possibly? Does it do it in 2wd? What transfer case do you have? The NP246 Autotrac unit has a clutch pack that could also be slipping?

Either a transmission clutch pack and/or the band are slipping. Plan on a transmission rebuild ASAP or get it properly diagnosed...

 

[nashranch]

I have no idea what transfer case i have. In 2W or normal driving i don't notice any slipping . I usually just put it in overdrive and it seems fine

 

[Fless]

To ID the transfer case, post up the Nxx codes that are in the glovebox lid and we'll interpret. It helps to post a pic of the 4wd dash switch, too.

When was the tranny serviced last? In what condition is the tranny fluid now? Dark red, brown, smells burnt? How's the fluid level?

 

[Eman85]

First...Check the fluid level and condition. Is it still red or is it brown and stink? I've fixed a lot of transmission problems with a fuel filter.
Transfer case should have a small round plate on the back of it with a red emblem and it has the transfer case # on it. While down there check the fluid in the TC.

 

[nashranch]

To ID the transfer case, post up the Nxx codes that are in the glovebox lid and we'll interpret. It helps to post a pic of the 4wd dash switch, too.

When was the tranny serviced last? In what condition is the tranny fluid now? Dark red, brown, smells burnt? How's the fluid level?

Here are those Nxx codes you asked for... Sorry kinda sliw since knee surgery

 

[nashranch]

Here are those Nxx codes you asked for... Sorry kinda sliw since knee surgery

Dash pics pkus old and new fluid

 

[Fless]

NP8 is a New Process 246 2-speed transfer case. The fluid you are showing looks like transmission fluid; these transfer cases take GM Auto Trak II fluid, which is blue in color.

 

[exp500]

Any Codes set? Dash check engine light works when key turned to Run?
Also you could have been going too slow for 2nd gear.
Try hill again in 2wd, then 4low.
Trans fluid looks fine.

 

[nashranch]

Yes it's tranmission fluid in the picture which somebody asked for. I can't check transfer case fluid at this time due to knee surgery

 

[nashranch]

Any Codes set? Dash check engine light works when key turned to Run?
Also you could have been going too slow for 2nd gear.
Try hill again in 2wd, then 4low.
Trans fluid looks fine.

No codes at that time. I had shifted manually into 2 ND and it just felt like it was gonna come to a stop.

 

[nashranch]

How much transfer case fluid does this unit hold??

 

[Fless]

Yes it's tranmission fluid in the picture which somebody asked for. I can't check transfer case fluid at this time due to knee surgery

My bad; I assumed you were showing the transfer case fluid.

 

[Fless]

How much transfer case fluid does this unit hold??

Just under two quarts.

 

[nashranch]

How much transfer case fluid doesthis unit hold??

No codes at that time. I had shifted manually into 2 ND and it just felt like it was gonna come to a stop.

Buried foot to floor and no go

 

[nashranch]

Thanks for all the input... tahoe has 184,000 on it. 30,000 ago it had overhaul with new sun shell. New oil and filter.. not sure what else. Probably due for new oil and filter.