4T60-E questions

[ChilinMichael]

My car has 209,600+. Engine and transmission are original...I've read that the transmission will run hotter as it's older, but as of now when it's 80+F out and I've done some in-town driving for about 10-15 minutes with extended idles before pulling onto the highway, the car sometimes kicks back out of overdrive within a minute of it kicking into it, and also disengages tcc lockup, thus resulting in 2500rpm at like 55mph. Needless to say, I have to shut the car off and turn back on to get overdrive or TCC back...this started happening last summer (it only happened once on an extreme hot day the summer before) and thus why I've gotten the following transmission cooler I'm going to install: http://www.amazon.com/70268-SuperCooler ... ion+cooler

I read from the 4T60-E ATSG manual:
If transaxle fluid temperatures become excessively high, above
approximately 130°C (266°F), the PCM will modify shift
pattern and TCC schedules to reduce the temperature.
If a situation occurs where a short or open is detected in the
circuit, the PCM will store a code and use coolant temperature
sensor information for transaxle temperature.

Can I really be hitting 266 without burnt fluid or any other issues noticable? I was thinking about changing the sensor, but, I hear it's in the sidepan. The other alternative I thought about was cutting the temp feed so the PCM does fall back on the coolant temp sensor (would this throw a light) and hooking up a real gauge.

Thoughts? Ideas? Opinions? Suggestions?

*Extra info: The Transmission had services by me at 170k and 200k, where 1/2 of a thrust washer was found each time. Otherwise, no clutch material or burnt fluid, everything looked fine.

[renchjeep]

If you get it figured out, let me know. Had mine rebuilt about 40-50k ago, and it does the same thing. Only when the weather is warmer than 50 or so. I installed a large stacked-plate cooler and a trans temp gauge. It is not getting too hot.

[spoiledred94]

I rebuilt my 94 4T60E-HD and had some slip IN to gear problems. Now with my 01 when i first set out she shifts great and after it's up to temp it starts sliding and thumping into 3 rd from 2nd. I have been thinking of a ATF cooler too.

[95naSTA]

KR can also cause the TCC to unlock.

You're not really going to know why it's kicking out of TC lockup without reproducing the scenario while scanning.

[ChilinMichael]

What's the cheapest scanner for my lovely OBD 1.5 I can get that will do that?

[MattStrike]

Cheapest?...

I know that PC-based EFILive V4 will do the job - you need the software and a cable that works with your laptop; serial or usb available. You can make the serial cable with radio shack parts for about $20 (although the max232 chip might not be carried anymore, but they are available online). Or you can buy them.

At one point they would give you a free/discounted copy if you created a profile for your car if they didn't already have one; using the available .ds file, but you'd have to check up on their forum to see if they are doing anything like that still.

[95naSTA]

Riv guys have a lot of info on scan tools: http://rivperformance.editboard.com/t10 ... 95-riviera

[ChilinMichael]

Thanks! I'm seeing the Actron looks good.

[spoiledred94]

I had that scanner with my 04. Loved it. Had to buy the OBD I to OBD 1.5 cable from someone here, that I don't remember who now. Live data, the whole H body platform. Many many, parameters covered. Simple to use and very reliable. Saved me a whole hecka lotta time