If not, it's only because it's not the right length. If you get a pinion flange, or
an adapter plate, then it would work. The adapter plate bolts to the U-joint end,
and sits inside the cup of the flange on the GT.
Lay the 2-piece and V6 side by side; if they're the same length, then it will work.
Here is the U-Joint end with the adapter bolted on it:
This is the diff yoke end of a one piece for the GT; no CV joint, it has the plate that
goes into the flange.
Two piece -vs- one:
You can see the adapter plate they use, that bolts to the U-Joint, then the
plate bolts into the flange. SO, that one piece with no CV joints will work
just fine, they're even sold like that. You would just need to correct the
pinion angle id needed, with an adjustable UCA.
If you were to put the 8.8" GT rear in a V6, all you need is the pinion flange,
or an adapter plate:
The 2-piece has too many failure points, the carrier bearing, and CV joints;
that's three potential failures but it's usually the carrier bearing that fails first.
A one piece either eliminates the CV joints with all U-Joints, or takes you to just
the one CV joint at the pinion flange.
How many miles are on it? I am in SW PA...