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Do both.
That is what I am likely going to end up doing.
I went with 2-3 inch taller tires back in 2008 and at some point I would like to go from a 3.08 rear to 2.73 rear gear also.
If you had 225/70/14 that is a 26.5 inch tire, 3.73 rear end, drove 65mph and had an over drive of 0.7 you would be turning 2152rpm.
If you only changed your rear end to 3.45 gears you would drop your 65mph engine speed to 1990rpm
Keeping the 3.73 and only switching tire size to 29 inch tires would drop engine speed at 65mph down to about rpm 1966rpm.
Going to 3.45 gears and 29 inch tires will drop engine speed at 65mph down to 1819rpm.
Keeping 3.73s and going to 30 inch tires will drop engine speed at 65mph down to 1901.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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