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Don't worry about adding some weight.
My calculations for adding 100lb is it will cost me 0.1MPG at speed on the highway. Real world fuel logs show me losing about 1 full MPG for the first 500lb I add.
If you could get a 3.55 explorer rear cheaply enough it would be worth it.
I would try for the 3.45 even if its hard to find.
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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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