i have just put in a fresh tranny and it only has 150 miles on it i also have a b&m supercooler with 8 inch fan on a thermastat the tranny is running anywhere from 200 to 235 i know it is to hot but how do i cool it down i have 3/8 lines running to the cooler and the fan also the ses light came on today 1870 manufacture control transmission what is wrong?? need help asap i dont want to destroy my new tranny i have to much money in it!!!!! also the tranny temp sending unit is in the case right above the shifting linkage is this a good place or should i move it to the pan for a more acurate reading of the fluid??? i have an autometer c2 tranny temp gauge by the way.

Thanks
Shane

 

someone has to know something?????????

 

a p1870 is a trans component slipping code. i work at a dealer and there is a bulletin for pretty much all 4l60e's that suggests to replace the valve body and spacer plate for that code. every one that i have had come in was fixed by doing just that. hope this helps.

 

P1870 code can be fixed with a Gil Younger Shift Kit 4L60-E. first you must verify that it is capable of TCC. install a 11/32 Check ball into the TCC solenoid spout, it should kill the engine. if you just got the trans from some one give them a call, they should be able to help. yes i would move the sender from the line pressure tap to the pan. it might be gettin a false reading. the line pressure tap hole has only a small feed channel to it and the fluid maybe heated up as it flows to it.

30 year veteran transbuilder
rs.bligh@sbcglobal.net