1990 mercedes 500sl no 5th gear auto

Does any one has info 5th gear electrical circuit. I have 2 car both transmission were rebuit both have no 5th gear. thanks ozzie

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What makes you think these 1990 models ever had a 5 speed automatic?
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The 129 500SL was 4 speed, the 129 300SL was 5 speed.

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