My transmission is slipping in overdrive when running the A/C on hot days. The truck has the factory external transmission fluid cooler sandwiched between the radiator and the A/C condenser. I'm wondering if the heat load from the condenser is causing the slipping. The transmission has unknown milage due to being a used transmission installed by the PO prior to me getting the truck. Should I try remounting the cooler, flush it, or start planning for a transmission rebuild? I changed the fluids and filter yesterday. 2001 1500 with 5.2 and 46RE

Thanks!

 

Did you get a chance to clean the gov. and pressure sol. when you changed the oil? I wish I had a torq-flight

 

You could try removing the check valve and getting a bigger aftermarket tranny cooler(do a search here on DF, lots of info on that) Also adding a tranny temp gauge will help a lot. And btw, you say slipping ? RPM surging but truck still moves? What happens when OD drive is off? Any CEL ?

 

I'm not trying to thread jack but I have a question, my truck does that, at highway speeds (55mph) when the engine is turning about 1500 rpms it will surge to about 1700 and the right back down, I never thought a whole lot about it but is it actually slipping?

 

zman do you know what size the AN fittings are?

 

I deleted the check valve a few months ago. Didn't clean the solenoids. What happens is the truck usually runs about 1900 Rpms at 70. With A/C on and sitting still long enough for the temp to start creeping up the Rpms move to 2200-2400 rpm. Once I get a nice long straight away with no traffic and consistent airflow at 70 the Rpms slowly move back to normal operating range. The factory cooler is pretty large. Probably 12x16.

 

I replaced the fan clutch and burped the cooling system. Also changed the water pump within the last few months.

 

BTW, I did add a drain plug to the transmission pan when I did the filter/fluid change. :-)

 

will these plus some high pressure hose work?

http://www.makcotransmissionparts.co...0001/13030.jpg

 

No cel light. No slipping when od is off.