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Automatic to Manual Transmission Conversion Parts for 66-77 early Ford Broncos. The NV3550 transmission is an ideal transmission swap for the early Broncos. This 5 speed is rated at 300 ft./lbs. at 7200 GVW. A stock Bronco weighs 4200 GVW. This is a record of one man's attempt to replace the stock 1970 Bronco three speed manual transmission with a 1977 Ford C-4 automatic.Buy early Ford Bronco manual transmission swaps and parts online at Bronco Graveyard. Find complete swap kits, rebuild kits, transfer case adapters and