Transmission problem?

[Wagnasty]

To start off the vehicle is a 2003 Yukon Denali XL with 230k miles. So back in the spring I began to have transmission trouble. Originally it started as a chatter or shudder around 40mph during normal driving/accelerating. It did it for a few months and then the transmission started slipping. Pulled the pan and there was a lot of aluminum and friction material. Did a fluid flush and made it a little better but I still ended up pulling the transmission.
Fast forward a few months and I was able to find a used in good working order transmission with 80k miles. I get the transmission put in and it still has the exact same chatter/shudder problem. Other than that it drives fine. I dont get the problem if I drive with tow haul activated or if the vehicle isnt up to normal operating temperature.

Is it possible I got another transmission with the exact same problem (drove fine in the other vehicle) or could it be my ecu?

 

[SLCHOE]

http://transmissionrepairguy.com/torque-converter-problems/

 

[southboundchicken]

Did you change the torque converter?

 

[ccapehartusarmyINF.(ret)]

Did you change the torque converter?

same question

 

[Wagnasty]

Sorry I left that out. But yes I changed the converter out.

 

[ccapehartusarmyINF.(ret)]

ll yes it is possible you got another tranny with the same problem but highly unlikely
Torque converter shudder in 4th while lockup is engaged; problem goes away when the brake pedal is pressed slightly to unlock converter: Need to verify line pressure, and provided no valves in the TCC (Torque Converter Clutch) hydraulic circuit are worn, replace the torque converter.
this is the closest i could find the the 30 most common 4l60e problems but it doesnt sound like thatll be much help

 

[Wagnasty]

I got to drive the other vehicle prior to getting the transmission out of it and it was fine. I did have someone help me swap the transmission out of my denali. So I guess there is a possibility that the ood converter could have gotten used because the replacement I got wasnt marked. My luck would be that the old one got reused.

When I drive today I will leave tow haul off and see if the problem stops when I hit the brakes. Assuming I do this while accelerating?

 

[OR VietVet]

I would lean toward the convertor as others have said but also maybe the signal and pressure like capehart said.

 

[Wagnasty]

I read that link about converters and symtom wise its exactly what ive got going on.

So I just took the truck out and got it up to temperature, turned tow haul off and at 40mph it started chattering/shudder. Feels like your driving on an extremely rough road. But I touched the brake pedal and it immediately stopped. Removed my foot from the brake and went right back to doing in.

My luck is its probably the converter.

 

[ezdaar]

http://www.oreillyauto.com/site/c/d...ck=Search_N0444_1022397_-1&pt=N0444&ppt=C0207

 

[boomboom baker]

My trans when cold take it awhile to shift from 3rd to 4th but when its warm it shifts fine

 

[BADRIDES]

http://www.oreillyauto.com/site/c/d...ck=Search_N0444_1022397_-1&pt=N0444&ppt=C0207

Anyone tried this before?

 

[SLCHOE]

Anyone tried this before?

Yep. It can in some cases help but i'm not so sure in this case. If you put ANYTHING into your trans for slipping though, this is the stuff.

 

[SLCHOE]

My trans when cold take it awhile to shift from 3rd to 4th but when its warm it shifts fine

Save $$ you need a trans rebuild or a rebuilt trans soon.

 

[Summajet]

I read that link about converters and symtom wise its exactly what ive got going on.

So I just took the truck out and got it up to temperature, turned tow haul off and at 40mph it started chattering/shudder. Feels like your driving on an extremely rough road. But I touched the brake pedal and it immediately stopped. Removed my foot from the brake and went right back to doing in.

My luck is its probably the converter.

I know this is an old post. I am having issues with my 03 Yukon L460E. Seems it shudders between 40 and 50 mph. If I press the brake pedal it stops. I assume it is the torque converter?

 

[BADRIDES]

I know this is an old post. I am having issues with my 03 Yukon L460E. Seems it shudders between 40 and 50 mph. If I press the brake pedal it stops. I assume it is the torque converter?

See post #12