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clinebarger · 06-24-2014, 07:02 PM

Starting on 11-29-07 the cooler line fittings changed to 9/16-18 thread, Before 11-29-07 the fittings are 1/4" NPSM on ALL 4L60E, 4L65E, & 4L70E, NO confusion, This is from a GM TSB.

06-24-2014, 07:02 PM	#9
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: 4L65 trans cooler adapter sizes Starting on 11-29-07 the cooler line fittings changed to 9/16-18 thread, Before 11-29-07 the fittings are 1/4" NPSM on ALL 4L60E, 4L65E, & 4L70E, NO confusion, This is from a GM TSB.