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Re: transmission change
I agree with Jay.......there were no Astro vans in 1980. If the Astro van had a 4.3 V6, the trans will bolt up to any small block. To use a 4L60E in a non stock application, you will need a trans controller and a TPS on your carb. A 700R4 will need a kit to properly connect the TV cable to the carb for proper operation as well as a torque converter lockup kit/wiring and switch.
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