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  1. 1StumpJumper

    M1008 with 700r4 swap.. MPG and top speed?

    1TON That was with 235/85r16 listed in post#70, and 31" tires for the M1009 @55 I believe it would put yours about 2400 rpm.
  2. 1StumpJumper

    M1008 with 700r4 swap.. MPG and top speed?

    Google grimjeeper gear ratio calculator. Presuming your "safe" refers to engine speed, shooting for.... @55 mph w th400 and 4.56 gears, the rpms are about 2800 @55 mph w 700r4 and 4.56 gears, the rpms are about 1850 in either vehicle. @55 mph stock m1009 runs about 1900 rpm I believe...
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