Hello, The built-in UPS shipping mod did not support Zip+4 postcodes. I checked out the USPS mod and they had a simple fix for it, so I ported it over to the UPS mod. This seemed like a no-brainer to me and it makes me wonder why this wasn't there in the first place. /modules/shipping/UPS/calc.php Lines 42 if (preg_match('#product#', $key) && $value) { $productCode = substr($key,7,3); // fix for US zipcodes e.g. 12345-1234