2004 yukon xl tranny slipping

[neo297]

I cant remember I think it was mobil 1 I know I checked at the time to make sure it was compatable with my year. I use mobil one oils in my other trucks( ford explorer), but have to use high zddp oil and stp red in my alfa due to the flat tappet cams. I have no leaks and i checked several times after to ensure the level was ok. The fluid now seems darker but still red not black. If it were to be clutch packs is it more reasonable to put in a rebuilt tranny and torque converter or just replace the clutch pack. My instinct is all the other parts are old and if the tranny comes out I should replace all I can. In my research I saw where some companies add extra clutch plates to the 3-4 pack is this needed for a stock motor that does moderate towing occaisionaly? This is the first transmission issue I have had with my chevys my 98 5.7 pick up never gave me any tranny probs until it was sold with 135,000 miles on it so I am somewhat cluless in this particular area. Thank you for responding so quickly.
Paul

[lyrikz]

Originally Posted by neo297

I cant remember I think it was mobil 1 I know I checked at the time to make sure it was compatable with my year. I use mobil one oils in my other trucks( ford explorer), but have to use high zddp oil and stp red in my alfa due to the flat tappet cams. I have no leaks and i checked several times after to ensure the level was ok. The fluid now seems darker but still red not black. If it were to be clutch packs is it more reasonable to put in a rebuilt tranny and torque converter or just replace the clutch pack. My instinct is all the other parts are old and if the tranny comes out I should replace all I can. In my research I saw where some companies add extra clutch plates to the 3-4 pack is this needed for a stock motor that does moderate towing occaisionaly? This is the first transmission issue I have had with my chevys my 98 5.7 pick up never gave me any tranny probs until it was sold with 135,000 miles on it so I am somewhat cluless in this particular area. Thank you for responding so quickly.
Paul

Two words, dextron 6. Dont run anything else. We do ALOT of transmissions and fluid changes. It used to be dex 3 would be ran in everything. Chevy changed over to the dextron 6 and we had issues running anything but Dex6 when it calls for it.. FLuids that are compatible wont act the same.

Example, i can run a compatible trans fluid in hondas but they shift like crap. You put the factory Honda fluid in and it shifts right.... just some thought.

[neo297]

Sounds good Now I just have to determine what it is going to cost to fix. My alfa is very tempermental on the type of gear oil and engine oil needed so I am familiar with the subtlety. I just was not aware for my yukon that I needed to use anythingelse other than making sure the brand I chose said it was for that year model gm. Live and learn. Do the clutch packs, solenoids, bands etc. come as part of a rebuilt tranny as a unit? It seems if there is no specific electronic component or solenoid that affects 3rd and 4th gear I'm looking at putting a rebuilt transmission in. Since it shifts into 3rd and then slips I am assuming it is likely clutch pack unless someone can advise me otherwise.

[lyrikz]

Originally Posted by neo297

Sounds good Now I just have to determine what it is going to cost to fix. My alfa is very tempermental on the type of gear oil and engine oil needed so I am familiar with the subtlety. I just was not aware for my yukon that I needed to use anythingelse other than making sure the brand I chose said it was for that year model gm. Live and learn. Do the clutch packs, solenoids, bands etc. come as part of a rebuilt tranny as a unit? It seems if there is no specific electronic component or solenoid that affects 3rd and 4th gear I'm looking at putting a rebuilt transmission in. Since it shifts into 3rd and then slips I am assuming it is likely clutch pack unless someone can advise me otherwise.

I would have it rebuilt completely since its out... Most shops i use, have found known deficiencies in the transmissions so they do things in those areas to make them better. So when you do have yours rebuilt, or get a rebuilt one they are better then the original. Im not sure if your tranny fits that scenario.

Also depends on your budget... If it slips in those gears, slap a clutch pack in it and drive it.. But that just seems shady ya know... Good luck.

[clinebarger]

Originally Posted by neo297

In my research I saw where some companies add extra clutch plates to the 3-4 pack is this needed for a stock motor that does moderate towing occaisionaly?

Every 700R4/4L60/4L60E I build gets 9 3-4 clutches VS 6 the factory uses, I consider it mandatory, Even the V6 transmissions that have 5 from the factory.

If it happened all the sudden its probably a apply curcuit problem(cracked servo piston, busted separator plate, bad lip seals on the apply piston, ETC...)
So i whould get it rebuilt because just putting clutches in it will not solve the apply curcuit problems.

[lyrikz]

Originally Posted by clinebarger

Every 700R4/4L60/4L60E I build gets 9 3-4 clutches VS 6 the factory uses, I consider it mandatory, Even the V6 transmissions that have 5 from the factory.

If it happened all the sudden its probably a apply curcuit problem(cracked servo piston, busted separator plate, bad lip seals on the apply piston, ETC...)
So i whould get it rebuilt because just putting clutches in it will not solve the apply curcuit problems.

I knew they had some goodies when rebuilding. Absolutely you would want to have it gone over completely.

Hey cline, do you guys have a tranny dyno there??? Whats your average rebuild cost on his transmission??

[clinebarger]

Originally Posted by lyrikz

I knew they had some goodies when rebuilding. Absolutely you would want to have it gone over completely.

Hey cline, do you guys have a tranny dyno there??? Whats your average rebuild cost on his transmission??

I have worked in some transmission shops that do have dynos, but a 4L60E is hard to dyno without a stand alone controller that shop owners dont want to buy.

$1200 to $1500 with R&R. $800 to $1000 bench job.

[neo297]

Thanks guys you have confirmed what I was thinking, there is just no sense in not putting a rebuilt in as long as the old one has to come out. I am going to make sure I have an up graded 3-4 pack do i need to ask for a 4l65e
to get the upgrade or are the rebuilt "4l60E's" already there. I know the 65's did not have 8 or 9 plates in 3-4 but had more than the 60's. I also thought the 65 had different planetery set. I am going to present these questions to my mechanic so I can ensure I get the best tranny to put in. I do appreciate the input and will post back when the repairs are done.
Paul

[clinebarger]

Originally Posted by neo297

Thanks guys you have confirmed what I was thinking, there is just no sense in not putting a rebuilt in as long as the old one has to come out. I am going to make sure I have an up graded 3-4 pack do i need to ask for a 4l65e
to get the upgrade or are the rebuilt "4l60E's" already there. I know the 65's did not have 8 or 9 plates in 3-4 but had more than the 60's. I also thought the 65 had different planetery set. I am going to present these questions to my mechanic so I can ensure I get the best tranny to put in. I do appreciate the input and will post back when the repairs are done.
Paul

4L65Es have 7 clutches, and have a 5 pinion planetary gear set VS 4 on 4L60Es. A quality rebuild on your 4L60E will be good.

[neo297]

Thank you I had takren it in yesterday at lunch and there were no dtc codes it showed it to be shifting into third and then it just slips bad he told me it would nee dto be pulled so I told him to get me prices on a gm rebuild that has 100,000 mile /3yr warranty v. his supplier of rebuilts with a 90 day warranty and based on cost we will proceed accordingly. Thanks to all who responded.
paul