Auto trans. noob-ish questions - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 5 (permalink) Old 09-19-2016, 03:07 PM Thread Starter
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Auto trans. noob-ish questions

Hello everybody.
I'm still trying to build me a street/strip 69 Cougar but i've got some stupid questions about automatic transmissions..
Until now, i just put it in "D" and stomped the right foot.
But, here in Europe 90% of cars are manual. I know nothing really, about automatic transmissions..
My car has an FMX transmission, and one of the biggest questions i have to do is: what if my engine will have 2000-6500 power curve and my transmission shifts way too early? Could i launch on the quarter mile in first, then shift at high rpms into second and then into D without damaging something? transmission will not receive nothing except an high stall converter, a transmission cooler and maybe a shift kit..
Oh, right, about shift kits. From what i understand the only purpose of a shift kit is to produce an harder, firmer shift, using softer or harder springs, right? I read shomething about TransGo shift kits that was also referring to manual shift option but i just do not understand what it really does..

ps. i was referring to power curve, maybe my roller cam specs will be helpful.
Advertised Duration intake 275 exhaust 281
duration @ .050: intake 224 exhaust 230 lobe separation 112.0
valve lift intake 536 exhaust 544

thanks in advance,
i hope you'll be helpful..
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post #2 of 5 (permalink) Old 09-20-2016, 02:06 AM
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Re: Auto trans. noob-ish questions

You can shift as you suggest . The 1-2 will shift where you want, the 2-3 may be ok as once you shift to "D" the trans is effectively back in auto made so may not necessarily shift right when you want manually.

Transgo are up there as the best shift kits . It's not just springs there is a series of mods to help prevent slip on the shifts

A manual shift kit is just that , there will be no manual shifts at all in D any more . Just 123 shifts , whatever gear the shifter is in it wont shift unless you do it manually
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post #3 of 5 (permalink) Old 09-21-2016, 01:06 PM Thread Starter
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Re: Auto trans. noob-ish questions

Thanks for your answer!
So, racing shifting manually my transmission won't hurt anything?
From what you've said i suppose a shift kit would be helpful behind a 400+ hp healthy sbf. I was looking at this kit: and it's not clear to me if it can be installed with manual shift only, or also acting like a classic automatic transmission with "d" option, but with benefit of firmer shifts.. If that kit could be installed both ways, what would you do?

Another question, if racing with my FMX being shifted manually at 6300/6500 rpm is not an issue, i bet an accidental shift into N while racing, with wide open throttle would do some damage to the engine due to an over-rev. It could be cool to build some kind of removable "barrier" to prevent shifter lever to go past D while shifting.. any ideas? Someone has already a Thought Something similar? (There are not aftermarket shifters for FMX).
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post #4 of 5 (permalink) Old 10-10-2016, 09:13 AM Thread Starter
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Re: Auto trans. noob-ish questions

No one can help?
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post #5 of 5 (permalink) Old 10-11-2016, 02:15 AM
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Re: Auto trans. noob-ish questions

That is a good kit . Usually the Transgo -3 kits are manual but can be used as either stage 2 with auto shifts and stage 3 manual. I've not used that exact kit for FMX but is C4 + C6 that can be done

I have answered on your other post on transmission forums re the shifter but this link might interest you

Using a B&M Cable Shifter with a Ford FMX Transmission | The Roosevelt Experiment (.com)

Some more discussion here . I'm just sharing the link I had saved , not actually tried this
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