70 B body heater box question

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70 B body heater box question #2700705 09/25/19 09:31 AM 09/25/19 09:31 AM
Joined: Dec 2003 Posts: 3,519 Lansing, MI 70gtx440dana OP master
70gtx440dana OP master Joined: Dec 2003 Posts: 3,519 Lansing, MI	Looking for the approximate break point date for the 70 B body non a/c heater box part number change from 2936680 to 2936681. Specifically, for a St. Louis built car. I know it was considered a late change....but not certain of the date. Thanks in advance! Joe 70 Road Runner 383-4 4 speed FJ5 & black guts 70 Charger R/T 440-4 4 speed FJ5 & white guts

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