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Old 06-24-2014, 10:54 PM   #10
solidaxel
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Join Date: Dec 2002
Location: Cactus Patch So. Az
Posts: 4,749
Re: 4L65 trans cooler adapter sizes

Quote:
Originally Posted by clinebarger View Post
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.
Thanks, that just confirmed my question on a 2003 4l65E
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