Only Hamish Marshall (28 no), Jonathan Batty and Jon Lewis reached double figures.
But David Lucas took 3-26 and Monty Panesar got Alex Gidman (36) after he shared 80 with Hamish Marshall (47no).
BBC: SPORT | Cricket | Counties | Northants on course for third win
McLaren won the man-of-the-match award after he removed Gladiators' dangerman Hamish Marshall (65), Steve Adshead and Ian Fisher in successive deliveries.
The 31-year-old's first over went for 10, but he soon found his rhythm and dismissed Hamish Marshall, Alex Gidman and Marcus North.
Durham had no answer to a massive Gloucester total of 301-8, sculpted by Chris Taylor (71), William Porterfield (68) and Hamish Marshall (56).
The England and Wales Cricket Board rejected the registrations of Wavell Hinds, Johannes van der Wath, Andrew Hall, Hamish Marshall and Justin Kemp.
Visiting skipper Alex Gidman responded with a ton of his own, hitting 116, chiefly in a second-wicket stand of 155 with Hamish Marshall (57).
New Zealand had 30 overs to face before the close and lost Craig Cumming for 16 and first innings centurion Hamish Marshall for six.
Ryan Sidebottom, also fresh from Twenty20 duty, had already removed Steve Snell with a lifter, while Luke Fletcher had sent back the dangerous Hamish Marshall.
All-rounders Chris Cairns, Nathan Astle, Chris Harris and Craig McMillan, batsman Hamish Marshall and bowler Daryl Tuffey took part in the recent breakaway Twenty20 league.
South African paceman Johan van der Wath claimed three wickets in as many overs, including New Zealand's Hamish Marshall caught at gully for a duck.
BBC: SPORT | Cricket | Counties | Northants on top despite Taylor
The tourists, who replaced Ian Butler with Hamish Marshall in the line-up that won last week's first Test by an innings and 99 runs, made a stuttering start.
BBC: SPORT | Cricket | Other International | Fleming sets NZ run mark with ton
Kadeer Ali had not added to his overnight 29 when he was bowled by David Lucas, before Hamish Marshall edged Brooks to Andrew Hall at first slip for 27.
Former England star Key made 18 before falling to a controversial catch from Hamish Marshall, and could be fined by the ECB for his angry reaction as he walked off.
He had some luck along the way, dropped by first Hamish Marshall on 74 and then by Kadeer Ali on 95, before completing his century by clipping Gidman through midwicket.
New Zealand resumed on 48-2, with Vincent looking to atone for his part in a mix-up which led to Hamish Marshall being run out off the final ball of the first day's play.
BBC: Fleming despatches a short ball on the way to a half century
Lewis, Ireland and Hamish Marshall each picked up two wickets as Gloucestershire wrapped their sixth victory of the season, the hosts being further boosted by the news that Franklin will return as their overseas player in 2010.
Worcestershire's bowlers were backed up by some superb fielding, with Ben Smith taking two difficult chances in the deep and Daryl Mitchell diving to his left at cover to catch Hamish Marshall for eight off Kabir Ali.
Hamish Marshall made a useful 69.
BBC: SPORT | Cricket | Other International | Kiwis build on Fleming double ton
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