351m transmission compatibility
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351m transmission compatibility
My newly acquired 77 F150 with a 351M has a leaky slipping transmission. It works, but I don't know for how long. My cousin has a transmission that came off a 400 (I believe he said a Mercury Cougar, but I could be wrong). Would that fit? He said it was recently rebuilt and I could just have it, so that would be really nice! Any help is appreciated! Sorry, I am very new to Fords 
Fleet Mechanic
Joined: Sep 2013
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From: Indian Falls, New York
Ask him what transmission it is. The 351M takes a big block bell housing. 429/460 etc works. It has to have a big block bell housing. If you get that it should be fine.
Distributors are the same too IIRC.
Distributors are the same too IIRC.
Ford Parts Specialist
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From: Simi Valley, CA
Only A/T available in 1977/79 F100/350, 1978/82 Bronco & 1980/82 F150/350 with 351M/400: C6 (17 trans pan bolt holes).
Some 1974/79 Cougar's with 400's, 1975/79's with 351M's came with C6's, while some came with FMX's (14 trans pan bolt holes).
This C6/FMX jazz also applies to 1973/76 Torino/Montego; 1973/79 Ranchero; 1977/79 LTD II (not an LTD!)/Thunderbird/Mark V cuz that's what a 1974/79 Cougar is...under the skin.
Some 1974/79 Cougar's with 400's, 1975/79's with 351M's came with C6's, while some came with FMX's (14 trans pan bolt holes).
This C6/FMX jazz also applies to 1973/76 Torino/Montego; 1973/79 Ranchero; 1977/79 LTD II (not an LTD!)/Thunderbird/Mark V cuz that's what a 1974/79 Cougar is...under the skin.
i ain't rite
Joined: Mar 2005
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From: Marlboro Mental Hospital.
but since both the 351M and 400 use the same bolt pattern, specifying "it has to be a big block bell housing " is a moot point.
and ford never made a "big block" that is a chevy thing.
and ford never made a "big block" that is a chevy thing.
Ford Parts Specialist
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From: Simi Valley, CA
Wanna bet?!
Originally Posted by shane_lxi
has a leaky slipping transmission.
OP said he believes his cousin said the 400 trans came from a Mercury Cougar.
How many Passenger Cars with 351M/400's came with a M/T? None!
And btw: Bell Housing: M/T / Converter Housing: A/T
The C6 doesn't have a separate converter housing, as it's made as part of the transmission case.
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