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HKramer
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I have a 1971 Mustang 2 door hardtop which has been in the family since new. It has an original 351 Cleveland 4V and FMX 3 speed automatic transmission. It has a 3.0 rear. The vinyl top is original.

 

At 65 MPH the engine is turning 3,000 RPM and it feels like it needs another gear (4th). Is there any way to replace the current FMX with a 4 speed automatic transmission and if so what transmission?

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Welcome to the site from Virginia. I have a manual but there's people here who have upgraded to the aod transmission. I'll let them chime in on what had to be done.

Sounds like a nice ride, we love pics.

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Welcome from TriCities WA.

-john

(jbojo)

351C 4V cc heads, 10.5 : 1 CR, 290 Herbert cam, Flat top forged pistons, forged connecting rods, Atomic efi,

C6 with Gear Vendor overdrive, 3.89 Tru Trac, Hooker Super Comp with 2 1/2" Pypes Exhaust.        

 

Some Mod pictures can be seen at: [button=http://www.7173mustangs.com/forum-garage?filterxt_uid=2026]Bojo's Garage[/button]

 

 

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Welcome from western Tennessee! ::welcome::

 

Check out Luxtangs thread on replacing the FMX with an AOD transmission. http://www.7173mustangs.com/thread-fmx-to-aod-swap-complete-report

 

Hopefully that will help.

Ron

The Rickster, a 1973 Mach 1, being restored as a tribute to my brother who passed away with COVID in July 2020.

Billy, a 1976 Ford Bronco, also needs a lot of work.

El Guapo, a 1986 F150, frame-off Resto-Mod.

Also, in the queue, a 1950 Ford F1 Panel truck and 1962 Falcon Ranchero

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Welcome to the site from Virginia. Looking forward to seeing pictures and hearing more about your coupe.

Mike AKA Ole Pony & Rare Pony
Our current Mustang garage/driveway
1973 Mustang Convert - Bought in 1974 - Still have it!
2004 Mach 1 Oxford White Auto, Bought Sept 06

20180127_082009.jpg

 

 

 

 

 

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Welcome to the club from northern Nevada. Check out Luxstang's link. If you need more help, post a question in one of the other forums.

 

Glad to have you here!

Doc

Project started 8-7-10

Completed: All new suspension, rebuilt 351C H Code bored .030 over with mild cam and intake, new 3.50 TracLok, custom exhaust system

Current "mini-project": interior upgrade :-/

[button=http://www.7173mustangs.com/forum-garage?filterxt_uid=76]Doc's Garage[/button][button=http://www.7173mustangs.com/thread-1973-mustang-convertible-restoration-and-modification]Doc's Wiki[/button]

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I have a 1971 Mustang 2 door hardtop which has been in the family since new. It has an original 351 Cleveland 4V and FMX 3 speed automatic transmission. It has a 3.0 rear. The vinyl top is original.

 

At 65 MPH the engine is turning 3,000 RPM and it feels like it needs another gear (4th). Is there any way to replace the current FMX with a 4 speed automatic transmission and if so what transmission?

 

welcome from Latrobe PA! Mine came w/the Q code ie cleveland dual exhaust hurst

wide ratio 4 speed manual but if it was an automatic or 3 speed standard-i would have gone a five or even 6 speed but i went gear vendors overdrive w/my top loader. This overdrive if could atch to the 6 speed ~ tremac-something to research then why not go all out w/a turbo or two then a NOS boost?

1_12_09_14_11_07_03.png
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Welcome from Oklahoma.

 

Ray

1971 Boss 351  

1972 Q code 4 speed convertible 

1971 Mustang Sportsroof  351-2V FMX 

1971 Hardtop (parts car)

1973 Mach 1 (parts car)

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Welcome from Phoenix. I run a c6 with 3.50 gears. At 65 it was screaming. I recently did the gear vendors overdrive and I really really like it.

 

But I had already built the C6 and was happy with it. If I was going to replace a FMX I would go AOD or manual.

'Mike'

73 Convertible - 351C/4V CC heads/4bolt/forged flat tops/comp 270/rhodes/mallory unilite/tri-power/hookers/glasspacks/c6/3.50 limited slip/Gear Vendors/Global West sub frames, strut rods and shelby style traction bars/ Rear sway bar/tilt steering (not original)

 

Pics of modifications included in: [button=http://www.7173mustangs.com/thread-1973-convertible--3335]My Garage[/button]

 

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Sorry for the belated reply.

::welcome:: from Luxembourg, Europe.

I did the swap ( well, had it done) and I'd do it again.

Check out the link that has been posted above on the details about the swap. It's easy to buy too much or the wrong stuff for the conversion.

spacer.png
Mike
"If I were you...... I´d rather be me." 😛
Check out my video:
http://www.7173mustangs.com/thread-my-mustang-in-action

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Welcome from Brisbane, Australia!

 

 

Greg.:)

 

::welcome::you got a real looker. Daniel Herberth also under Pig Vicous Racing on Facebook and somewhere on here-has a real nice of Australian series Cleveland Headers. His mustang, w/a 408 Stroker in it. His 73 convertible does a lot of racing.

1_12_09_14_11_07_03.png
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