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Re: LS swap for my 75
The overdrive will really shine on the highway, but the 700R4 and 4L60e have a lower 1st and 2nd gear than the TH350 you currently have. If you are going LS, I would use the 4L60e and let the PCM control it as well.
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1974 Jimmy- 5.3/4L80e/NP241
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