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Does this 7.3 not have a turbocharger?
If you are not going to install a turbo you are throwing away a 10% to 20% fuel economy increase.
Decreasing the final drive ratio on a non turbo diesel is going to increase exhaust gas temperature as you try to work the engine harder at lower RPM. You will just end up blowing more heat out the exhaust.
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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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