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Topic: FMX or C4? (Read 1723 times) previous topic - next topic

FMX or C4?

Well I was planning on getting a C4 to Rebuild and put behind my future 351w project, But I ran into an interesting offer.
Need some advice!

I can get a complete 1968 FMX Tranny for $25 delivered (Internal Condition unknown).
Thing is, I know nothing about this tranny~Is it any good, How hard is it to rebuild? any major flaws/Downsides???
OR
Should I just keep with the C4 plan?

Thoughts?

~Project ThunderStorm = '84 Charcoal Thunderbird - First Car - Long Time Work in Progress~
~Project (No Name Yet) = 1970 Plymouth GTX/RR "Clone"~

FMX or C4?

Reply #1 –
Well I know the AOD is a FMX with an OD gear. Other than that I don't know much about FMX trans. I know the C4 is popular with drag racers so the hop up parts should be cheaper.
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.

FMX or C4?

Reply #2 –
Don't the FMX trannys have a cast iron case ?
Fox-less at the moment

FMX or C4?

Reply #3 –
The FMX was introduced for the "70" 351 Cleveland, while the "69/70" 351w  used a C-4.

As far as I know the FMX only works with the 351c.
Somebody can correct me if I'm wrong.

FMX or C4?

Reply #4 –
Quote from: Turbojet;359013
The FMX was introduced for the "70" 351 Cleveland, while the "69/70" 351w  used a C-4.

As far as I know the FMX only works with the 351c.

Somebody can correct me if I'm wrong.

Well it actually was introduced in 68  and were made till around 82 ish , but thats the only correction I can offer
Fox-less at the moment
 

FMX or C4?

Reply #5 –
Stay with the C4, it will be cheaper to build and will be stronger then the FMX.

Mr. Bill

FMX or C4?

Reply #6 –
The fmx has a castiron case with a removable bell housing so it can be used with 351w or 351c. They are alright but I have had a few fail so I would say C4

FMX or C4?

Reply #7 –
The late 289, 302, 351W, and 351C all have the same bellhousing bolt pattern as do the motor mounts. The 351M and 400 have the big block 352, 360, 390, 427, 428, 429, and 460 bellhousing.
As far as I know the FMX has a removable bellhousing so it can be used with either the 5 or 6 bolt blocks.

P.S. the early 289 and 260s have 5 bolt bellhousings.
88 Cougar LS 5.0 .030 over, ported E7s with GT40 valves & trickflow springs, Proform roller rockers, HO cam, removed air silencer, K&N filter, smog pump delete, 2.25" dual flowmasters, Pacestter H-pipe & headers, HO computer, 65mm TB, Explorer intake, 19# injecters, 3.45s, rebuilt posi, and TCI shift kit.

FMX or C4?

Reply #8 –
:iagree::cheers:  Bruce Nailed it


86' T/C 4.6L DOHC
16' Chebby Cruze 1.4L Turbo
17’ Peterbilt 389 600hp 1850ftlb Trq 18spd

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