[Rocketbird]

Originally Posted by brainsboy

To my knowledge they were made as far back as the 50's. I believe they came in the 54 thunderbirds.

I have used quite a few FMX transmissions for racing in the past. One advantage is that you can complete rebuild the transmission while its still in the car. A shift kit is not really needed, if you want harder shifts just increase the main pressure with a tighter spring. I ran a FMX for 6 years in the car attached to my post.

I know that this is and old thread but what you are saying is relevant.
Brainsboy, I believe to have the FMX transmission in my '79 T-Bird and I was thinking of adding a shift kit. You mention that that I could just add a tighter spring to increase the main pressure to get harder shifts.

SO now my questions to this are:
-Where could I get a tighter spring to replace the old one?
-Where is this spring located and how hard would it be to replace?, as I am not that knowledgeable with transmissions.

I know as my second post (no one knows me that well yet)I am probably asking too much or not giving enough information just let me know.

[Crosley]

rocketbird,

welcome to Hotrodders.com

when you have new questions , start a new thread instead of a new questions to a 7 yr old thread.

TransGo is your best bet for a shift kit for the FMX. I sold an old TG - FMX kit on ebay a couple yrs ago , that had laid around the shop for way too long.

TransGo cataloged the FMX kit up till a few yrs back

[Rocketbird]

Ok I will post it as a new thread. sorry about that

[Rocketbird]

I was reading some older threads about FMX transmissions and I read a post from Brainsboy on this forum, that mentioned about using a tighter spring to increase the main pressure to get harder shifts Instead of adding a shift kit.

I believe that I have the FMX transmission in my '79 T-Bird and I was thinking of adding a shift kit or maybe this possible route.

SO now my questions to this are:
-Where could I get a tighter spring to replace the old one?
-Where is this spring located and how hard would it be to replace?, as I am not that knowledgeable with transmissions.
-Would it be just easier to add the shift kit instead?

[Crosley]

Rocketbird;

I have merged your questions into one thread here.

as I posted , TransGo may have a kit or parts.

[SSedan64]

TransGo still lists 2 Shift Kits here>> http://www.transgo.com/sk_ford.php
and 3 Reprogramming Kits here>> http://www.transgo.com/rpg_ford.php