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You don't want a 0.2:1 over drive.
Unless you are running a really weird tire size and rear diff ratio that doesn't make any sense.
Really the most over drive you will find useful would be some where around .4 or .5 to 1 with normal diff gears and tire size.
If the engine runs too slowly it bogs down, doesn't make enough power, the internal vibrations hammer away at the connecting rod bearings until the engine fails.
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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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