FMX will not engage

thunderbud2002 · 12-20-2012, 01:08 PM

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.

Franks68coupe · 12-20-2012, 01:57 PM

Sounds to me like it needs more fluid. If my FMX is low by a drop it's a paperweight.

TommyK · 12-20-2012, 03:22 PM

Quote:

Originally Posted by Franks68coupe

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?

thunderbud2002 · 12-23-2012, 10:23 AM

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.

Franks68coupe · 12-27-2012, 09:10 AM

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.