'96 Yukon 4L60E

Likely reaching the end of its life cycle. When converter locks it still uses tranny clutch as well and the shudder you feel may be then slipping and chattering a bit with converter locks up and provided a torque surge via momentum of engine mass at shift being slowed down.

----------------- TheSnoMan.com

Have you had it scanned for trouble codes?

Not very likely at all here. Facts do not support this.

----------------- TheSnoMan.com

No, I haven't had it scanned. I don't have a check engine light. Will the tranny throw a code without activating the light?

Thanks, Rich

That's what I feared. Given these symptoms, do you think the impending transmission failure will strand me? Or will I simply lose torque converter lock-up? I'm wondering if I should keep driving it until failure or if I should get it rebuilt now. I'd obviously rather not get stranded.

Thanks, Rich

A tranny that is worn out but still fuctuioning othersie will not code

----------------- TheSnoMan.com

It will not likely quit overnight and if you baby it is may still work for some time. Just to not pull it hard and downshift out of OD on grades. The problem likely does not lie in converter but I tend to think it is in the tranny itself though it is hard to be 100% sure with given data.

----------------- TheSnoMan.com

The shudder is clutch chatter and that is what it will cause. If there was a tendacy to miss fire it would be present at other times too and the chances of it being timed excatly the same evey shift to cause shudder is very slim to nothing. This is a tranny isse not engine and with itself mileage he has done well and gotten a good life span out of it (well above average) and it is time for some attention.

----------------- TheSnoMan.com

Yes, the transmission can set a code without turning on the CE light. The CE light is emissions related, transmission failures are not necessarily emissions related.

There is a very common problem on the 4L60E transmission where the Torque Convertor Clutch valve in the valve body wears the bore of the valve body, it is usually accompanied by a code P1870. The symptom is torques convertor clutch shudder. Sonnex has a repair kit available to ream the bore. Any good transmission shop should know about this and be able to effect a repair for much less than an overhaul as recommended by another here. Point being, there is no point in guessing when that transmission has the capability of reporting malfunctions via stored trouble codes. Any other recommendations at this point are malpractice.

See if there are any codes stored!!

Absolutely false.

Yes you are correct, you are absolutely false aarcuda69062

----------------- TheSnoMan.com

Here we go again, another completely false and misleading statement. What's new?

Ian

An apt description of SnoMan's uninformed blatherings!

Ian

Ah, the saga continues, and you have him! Sorry Ian, but better you foks than us.

Oh one quick thought. You are way to nice to him. Hint, do his sig, he really likes that.

cYa Roy

I'm sorry, Shep, I'm not sure what you mean. I'm assuming that I must have been short with you about something. Sorry about that.

Ian