• 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Transmission, what should I do?
#1
I've got an FMX with over 120k miles and it's leaky and shifts kind of rough.  I've got a few options:
-Rebuild FMX
-Swap in a C4 or other manual transmission
-Swap in AOD transmission

I'm planning on adding some power to the engine through a new intake, carb, and maybe cam.  Originally I wanted to go with a manual transmission, because I love driving manual cars, feels more engaging.  Then I considered sticking with rebuilding the FMX might be the best route for now.  Now I'm seeing a lot of cars going to AODs.  Any advice, suggestions?

73' Convertible
351C 2V
3-speed auto FMX
  Reply
#2
I went from a leaky C6 to a manual TKO600. The options really depend on your budget. I love my combo. No regrets. You can look at my build thread for the details.

Sent from my SAMSUNG-SM-G930A using Tapatalk

[Image: 20160929_171923_edit2_small.jpg]

1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump
Strange center section with Truetrac, 3.5 gear and 31 spline axles, 4-wheel disc brakes
  Reply
#3
(12-05-2019, 01:40 PM)jmohring Wrote: I've got an FMX with over 120k miles and it's leaky and shifts kind of rough.  I've got a few options:

-Swap in a C4 or other manual transmission

Any advice, suggestions?
The C4 is an automatic.

Another option is a Gear Vendor overdrive behind your rebuilt FMX or a C6.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
  Reply
#4
In not worried about being original then I vote AOD, relatively cheap swap.

[Image: adpic.jpg]
[+] 1 user Likes 72MustangSprint's post
  Reply
#5
If you want simple and easy just rebuild your fmx, should cost 750 to 1000 bucks.
  Reply
#6
jmohring Wrote:I've got an FMX with over 120k miles and it's leaky and shifts kind of rough.  I've got a few options:
-Rebuild FMX
-Swap in a C4 or other manual transmission
-Swap in AOD transmission

I'm planning on adding some power to the engine through a new intake, carb, and maybe cam.  Originally I wanted to go with a manual transmission, because I love driving manual cars, feels more engaging.  Then I considered sticking with rebuilding the FMX might be the best route for now.  Now I'm seeing a lot of cars going to AODs.  Any advice, suggestions?
I would ask yourself what you really want. An Auto or a Manual. If you would be happier with a manual then no point sinking money in the FMX or another auto. You're running 2V heads and adding an intake and 4bbl carb. Stock Cam? If it is a mild engine you could do a T5 swap pretty cheap. I did that and have been extremely happy. Even with the significant engine upgrades I have done since the swap the T5 is holding up just fine.

73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

- Jason


[Image: 082-hot-rod-power-tour-2017-1970-1970s.jpg]
  Reply
#7
The FMX is a pretty tough trans, worth keeping, but it doesn't get the respect it's worthy of for some reason with most people. In our cars they're found behind a 351c ( 2v ). In '70, the FMX was behind the 351c 4v, in '71 the C6 was being put behind the 4v, but that doesn't mean the FMX is not up to the grunt. If you should decide to keep it, a company called "Trans-Go" offers re-programming kits, ( shift kits), that really wake the FMX up. Firmer shifts and longer trans life are key selling points, and, I believe they offer a few different levels of performance kitting. Along with an AUX trans cooler, I run one, and it was well worth doing.
[+] 1 user Likes Spike Morelli's post
  Reply
#8
I too did the swap to a manual. I'd never go back to an automatic willingly.

What do you really want? Does that suit what you plan to do with the car? Base your decision on what's best for your situation.

Any PROPER hot rod NEEDS 3 pedals!

Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

[Image: 1_12_09_14_10_15_11.png]
[+] 1 user Likes droptop73's post
  Reply
#9
you could always cut holes in the floor and do this ... 

[Image: flintstone.gif]

[Image: siggy.jpg]

  Reply
#10
(01-31-2020, 01:00 PM)droptop73 Wrote: Any PROPER hot rod NEEDS 3 pedals!

Totally agree - which is why our C4, C6, FMX, and AOD-equipped cars are perfect:  Gas Pedal, Brake Pedal, and E-Brake Pedal.   whistling



rofl Cool rofl Cool rofl Cool rofl

Eric

[Image: mach1sig2.gif]
  Reply
Share Thread:  


Possibly Related Threads…
Thread Author Replies Views Last Post
  C6 to aode transmission swap Scottyhudson 3 149 02-12-2020, 12:51 AM
Last Post: Don C
  Transmission cooler line nut is broken n_reckless 10 584 10-22-2019, 10:40 AM
Last Post: Mister 4x4
  1973 FMX transmission conversion JULIENHATSWELL 9 910 05-21-2019, 07:32 AM
Last Post: Omie01
  Transmission advice Tataocb 24 2,160 04-13-2019, 04:12 PM
Last Post: Don C
  C4 Transmission - Missing Kickdown ? Parkka 3 451 04-09-2019, 07:29 PM
Last Post: Hemikiller



Users browsing this thread: 1 Guest(s)