GM Fanatic
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Thanks for the membership. Found this site while searching for info on 4L80E interchangeability. Currently have several square body GM ('74 GMC C15, '78 Chevy C30 dualie, '80 Chevy K30, & '87 V10) and two round nose GM ('95 Chevy K1500 Suburban & '95 GMC C3500). As a result I'm occasionally in need of information; and have been impressed in previous visits to the site.