73-87 GM Truck 81-91 SUV SM465 Chevy Transmission Cover Tower Cast Iron 3901131

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• Good used GM SM465 cast iron cover with shifting forks and rails.
• Part number 3901131.
• This case top has the provision for a reverse light switch.
• This is the cast iron case top not the aluminum cover used in the 88 plus pick up trucks.
• Note: this is a later cover that has two threaded holes one for neutral sensor and one for reverse light switch.
• Same as the earlier version but with provision for the neutral safety sensor.
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