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Here are m current # and then that numbers changes with 5sp and 3.67 gears
current 3.07 and 4sp (1:1 trans ratio final) with 24.7 dia tires @ 75mph= 3132 rpms
3.67 with 5sp overdrive (.75 trans ratio final)= 2808 rpms
Here are gear change MPH with the 722.4 /3.07 @ 6000 rpms 1-4= 34/60/97/144
722.5 with 3.67 @ 6000rpms 1-5 gears= 31/54/83/120/160
722.6 with 3.67 @ 6000rpms 1-5 gears= 31/50/81/120/145
You can clearly see the 722.6 5 sp with a 3.67 rearend would give me a very nice quick ratio setup as well as gain better fuel economy in overdrive freeway cruising @ 70-75mph.
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