Yes it will.
Yes, There the same.
YES it will.
Yes, It will bolt right up.
No it will not it is all different, It won't even match up with the cab.
it is made of aluminum alloy
Unbolt it from the floor.
No they are not, The 78 does not have a computor. But the 88 does have and that means more wires and different wires.
NO it will not work. Everything is different. Cab mounts, body weith, ECt.
SAE 10w30
117.5 longbed is 131.5
High-powered explosives.