The 4:10 Dana 60 was not factory installed in that GTS.
Someone added it before your buddy bought it.
In fact, there were never any A-Bodies made with Dana 60s in them with the exception of the '68 Hurst built Hemi 4 speed race cars.
And even then, they were not A-Body width, but B-Body width.
Ok, my friend bought it from his cousin who didn't drive the car for sometime. Friend bought it sometime in mid- 70's. There was a lot of carbon to be blown out of it. And I know it wasn't an 8 3/4 cause it wasn't rounded.
