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Old 05-07-2005, 22:12   #1 (permalink)
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FMX to C4 ET gains

Finally run at Willowbank, the only changes to car was swapping the FMX to a C10 using same modified stallie. The new trans has shift kit and full man valve.
Gained >.3 sec on 1/8 mile run from 8.611 to 8.336
1/4 time from 13.36 to 13.04 thou had to back off before the line has the car was vibrating badly, think its the rear left rim!
Still plenty more in it!!
Verdict FMX's are power slugs as many claim!
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Old 05-07-2005, 23:27   #2 (permalink)
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Re: FMX to C4 ET gains

I'm not 100% sure but I think the C4/10 also has better gearing.
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Old 05-08-2005, 05:13   #3 (permalink)
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Re: FMX to C4 ET gains

FMX's should be used purely for towing caravans and sinking car theifs to the bottom of the ocean
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Old 05-14-2005, 08:15   #4 (permalink)
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Re: FMX to C4 ET gains

FMX are supposed to be the fastest shifting gearbox Ford made. It's true but they are heavy. Chuck a Stage 2 B&M shift kit in a C4 and it shifts faster, harder and its lighter. But as standard boxes go the FMX did a great job.
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Old 05-19-2005, 00:36   #5 (permalink)
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Re: FMX to C4 ET gains

In other words, only good for LTD's and original automatic GT's.
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Old 05-20-2005, 07:14   #6 (permalink)
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Re: FMX to C4 ET gains

Good for any person who wants a car with a standard fast shifting gearbox.
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Old 05-21-2005, 01:49   #7 (permalink)
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Re: FMX to C4 ET gains

Is it true the FMX had a steel casing and the C series boxes had aluminium.
If not.........what made the FMX so much heavier ????????
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Old 05-21-2005, 02:07   #8 (permalink)
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Re: FMX to C4 ET gains

FMX had steel housing and bolt-on alloy bellhousing; not sure if all like that.
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Old 05-21-2005, 04:34   #9 (permalink)
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Re: FMX to C4 ET gains

Yep. I recon its like cast iron housing and all bell and extension housings. FMX made by Borg Warner and also found in Jaguars !!! Believe it or not ???
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Old 05-21-2005, 04:40   #10 (permalink)
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Re: FMX to C4 ET gains

Yeah i have had both, obviously the spline on the fmx is bigger and stronger but comes at a cost bit like a c6 to me it's a big block gearbox, my new c4-c10 has a deep alloy pan that stop's flexing and disapate's heat much better, only thing is the cost of pan about 340 dollar's. I have gone as far as you can go on my c4 without spending twice as much eg planetary gears and roller bearing's instead of thrust washer's and billet servo. but at 1260 dollar's for my box minus converter and line's it's money well spent.
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