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Re: 5.3 ls with th350 questions
Overdrives will always be preferred for fuel mileage, and they allow you to run a steeper rear end. O/d with a 3;73 or higher is pretty popular around these parts.
The th350 will still work, but then something closer to a 3;23 will keep it manageable on the freeway.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING 
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