A few comments here.... While I have never reversed one of those transmissions, I have worked on repairing transmissions my entire life. Mostly automatics, some stick. First thing I see is the 45% reduction. Using that ratio, it will give you nearly 2:1 in reverse. Much too high for your application. Might give you a top speed rivaling NASCAR if you have the power to pull it, but not a lot of pulling torque. Next thing is the whole Spicer thing. In my experience, Spicer transmissions are not the strongest. Saginaw is also not really robust for heavy applications. I would want to look at Dana or Borg-Warner if it were me....or even Fuller/Eaton or Rockwell. Another possible consideration would be to look for an older overdrive unit from an antique car. Every make used them at one time or another, and they should be readily available. Also, are you sure about the 5 to 1 ratio in the rear?? Sounds very high to me. In direct it would give you a top speed around 35 miles per hour on 15-inch rubber. I would think that such a ratio would be used with BIG tires/wheels. Bigger than would likely be found on a 1-ton pickup.
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