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4L65 trans cooler adapter sizes
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06-24-2014, 07:02 PM
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clinebarger
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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.
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