FMX will not engage - Vintage Mustang Forums

 
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post #1 of 5 (permalink) Old 12-20-2012, 01:08 PM Thread Starter
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FMX will not engage

Ok guys I have bought a vehicle cheap, non running. It has an FMX from a mid 70 torino. I dropped in a built 351w. I also did my own rebuild on the transmission. It was just tha basics, new disks, metals, front band, vacuume modulator. I reused the TC. I did the band adj per the haynes manual.
I was told that since I rebuilt it that I could run Dex/Merc instead of the Type F, so I did.

My issue is that the trans will not engage in 1st of reverse. Move the shifter through the gears and the RPMs don't even drop. Now with the trans in park, I rev the engine to about 3,500 rpms, let it come back down to an idle and pull it down into gear and it will engage. When shifting from R to D it takes about 3-4 seconds but it runs I can drive it around the block When I stop at a stop sign sometimes it doesn't want to go back to 1st.

I'm at a loss guys. thanks in advance.
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post #2 of 5 (permalink) Old 12-20-2012, 01:57 PM
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Sounds to me like it needs more fluid. If my FMX is low by a drop it's a paperweight.


68 coupe with a 351W
Mods: a lot... just ask if you're interested
07 gt
99 Gixxer 750 (When four wheels are too many)

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And most of the times I've smashed my nuts flat with a hammer it hurt real bad so I stopped.
Just liked the quote
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post #3 of 5 (permalink) Old 12-20-2012, 03:22 PM
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Quote:
Originally Posted by Franks68coupe View Post
Sounds to me like it needs more fluid. If my FMX is low by a drop it's a paperweight.
+1

Did you pre-fill the torque converter?

1973 Mustang Convertible
460 D0VE-C Heads w/CJ size valves, Lunati voodoo 227/233 cam, Edelbrock performer rpm manifold, FPA headers, Holley 950 HP carb, C6 w/2500 stall converter, 3.25 trac lock
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post #4 of 5 (permalink) Old 12-23-2012, 10:23 AM Thread Starter
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The TC was pre-filled and has fluid. It seems to me like it needs more fluid too but when I check the fluid it looks like it's about half a qt overfilled. I've never had a problem with a little to much fluid in a trans.
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post #5 of 5 (permalink) Old 12-27-2012, 09:10 AM
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Any update on this thunder? I never trust the dipstick on mine... I have no idea where it came from, is correct or anything. If it engages and shifts smoothly, it's got enough kind of thing.


68 coupe with a 351W
Mods: a lot... just ask if you're interested
07 gt
99 Gixxer 750 (When four wheels are too many)

Quote:
Originally Posted by 120mm View Post
And most of the times I've smashed my nuts flat with a hammer it hurt real bad so I stopped.
Just liked the quote
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