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    swapping 205 for a 203

    I'm taking the 4 speed and 205 out of my 1980 K20 and installing a turbo 400 and 203 unit that I have here in the shop. Since, my truck has factory lockouts, I heard that a shim had to be added when using a 203 with lock outs? If so, can someone give me more details on what needs to be changed...

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