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Originally Posted by avro206
These trucks came with 700R4s--maybe not your year but your generation did.
You'll get better accleration AND mileage. Win-win situation
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Not true. The correct gears w/ a TH350 will generate better acceleration because the spacing between first and second gears is closer.
A 700 will pop you off the line faster, but unless you have a very strong low-end pull, it will fall flat on the 1-2 shift. The reason the 700 has a 3.06:1 first was to give the feeling of a strong engine, with one that had very little torque.
The mileage difference between his 350C (lockup) and a 700 aren't as great as you might believe. Plus, 700s are weak.