McIntyre has returned to management at the Scottish Premiership's bottom side, 13 months after being sacked by County.
"We got off to a bad start but managed to turn things around," Jackson, now at Hull City, told 'BBC Scotland'.
"Not only did we survive that season but we went on to win a trophy [the Scottish League Cup] the following season, so fingers crossed he can do a similar job at Dundee.
"He's an excellent motivator. Finding the quality in the squad and getting the best out of individuals is vital. You have got to find the right system.
"It took a little bit of time for us but once we found a certain style of play that suited us, we were very difficult to beat."
His side eventually finished ninth, sixth and seventh in the top flight before he and assistant Billy Dodds were sacked in late September 2017 with the club sitting 10th, before eventual relegation in May.
"He demanded a standard from us every day at training; that was maybe where we were lacking before," Australian Irvine recalled.
"We trained the way we played; that high-tempo, aggressive style, always being on the front foot, was what got us out of trouble that season."
"They had a good chemistry, a good relationship," Irvine added. "They seemed to work well together at County with the success we had. He would be an excellent number two.