I have my heater box out and duct off right now so it was pretty easy, BUT it was not easy to do. Somethng that made it a little easier, not very safe but easier, was I heated the duct up by my torpedo heater first and made it softer and more pliable. You could probably do it w/a heat gun or hair dryer but I used what was right there at the time.
1985 CJ-7, 258 w/a weber carb and HEI, 2.5"lift w/32" tires, 1/2"shackle lift, Dana 300, T-5, AMC 20 w/one piece axels, and Dana 30, YJ tub swap w/CJ tailgate, chevy blower motor upgrade, homeade body sliders, flush mount LED taillights......much more to email@example.com
"And on the eigth day, Man created BEER!"