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Old 02-21-2011, 11:30 AM   #5 (permalink)
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Join Date: Feb 2010
Location: CT, USA
Posts: 544

RaceJeep - '98 Jeep Grand Cherokee (ZJ) 5.9 Limited
90 day: 13.62 mpg (US)
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I'd give the 3.45 a shot and see what happens. With the low powered little 4 cylinder, 3.08s will likely lug it down too low. If it doesn't feel like it's close to lugging at times with the 3.45s, then maybe try the 3.08s.
Call me crazy, but I actually try for mpg with this Jeep:

Typical driving: Back in Rochester for school, driving is 60 - 70% city
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