Its a 2002 4t65e hd. There're two lines that goto the cooler, it only came with one. I have te lower smaller coupler but what size is the larger one and part number if possible, thanks.

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86 GT Convertable 3800sc

As far as I know coming from the feed and return, both 4T65eHD tans lines are 3/8"

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

Not on this one, i took out the lower one and it slipped inside the other hole. I did this as I had a couple of them kicking around the shop and tried them but they to were too small.

quote Originally posted by Dennis LaGrua: As far as I know coming from the feed and return, both 4T65eHD tans lines are 3/8"

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86 GT Convertable 3800sc