What's the physical appearance difference between the c4 and FMX

[mustangman70]

Just like the title says

 

[mikec35]

look at the pan, c4 has a square pan, fmx has an indention on one of the corners.

 

[mustangman70]

Sweet thanks mike

 

[Dark Knight]

FMX ways a ton too, center is cast iron.

 

[fvike]

I think I've posted this before, but here it is again...

 

[351LX]

The bolts which fasten the bellhousing to the main case are inside the bellhousing on a C-4 and outside the bellhousing on an FMX.On the FMX the bolt heads point towards the rear of the transmission and thread into the bellhousing through ears on the main case so they are visible.

 

[GoinBroke]

Also take a magnet and if it sticks to the center case it's a FMX.

 

[NasaGT]

Use the pics fvike posted to count the bolts. If you can get a shoulder under a car you reach over and count the bolts on the pan by feeling them and know what kind of tranny it is without ever seeing it.