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Re: Overdrive choice?
Have you considered swapping out your rear end gears? 3.39s are available from several vendors. If this isn't enough, you could swap out the whole axle for a Ford 9", for which there are more gear options.
Keep in mind, the Muncie SM420 has an incredibly low granny gear. You're not giving up so much by going with taller gears. In fact, it is likely that you could still end up with a wider gear range than you could get with a 5 speed.
FWIW, I'm planning the Muncie + 3.39s. I figure at highway speeds my RPMs will be in the mid to 2,000s.
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