4L65 trans cooler adapter sizes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

06-24-2014, 10:54 PM

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

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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53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25
55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73
62 Solidaxle Corvette Roman Red (327
340hp 4spd 3:36) C4 & C5 suspension tube chassis
LS 3 4L70E
65 Corvette Coupe 327 350hp 4spd 4:11
78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42
2000 S-Type 3.0 (wife cruiser)
2003 GMC SCSB 5.3 4L60E 3:42

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