I'll just paste my response & info i have, also why don't u use the clutch parts from your old cab?


PARTS U NEED:
1.Tranny & Tranfer
2.Clutch pedal assy.
3.Clutch master cyl, slave cyl and hard&flex line
4.Shifter surround for inside the cab

You'll have to take good measurements from the donor truck to get the holes in the firewall right for mounting
the clutch master cyl.
I don't remember what size bi-metel hole saw you need,maybe someone else does.
You need to cut a longer opening in the floor for the shifters.
You don't need another ECU and you're drive shafts will fit fine.
All autos i've seen have had a gear ratio of 4:30 and factory 5-speeds have 4:10s.

You'll also have to fix the wiring harnees so the truck will still start.
Now in the big group of plugs that hook to the auto theres a white round one that has three wires,
two big wires and one small.You have to wire the two big ones together.
On mine i threw the auto in the junkyard so i cut the half off the tranny(leaving a few inches of wire on it)wired
the big ones
together cut the small one off and pluged it back into the truck,works great.You have to becareful though because
the truck will try to start whether the clutch is in or not.