The rear end cover break's by the spring also the front of the differential, from torque twist because of the in-between year's designing a new rear end.
78 & 79 are the only years you can NOT get a traction-bar for.
Please go to vbandp.com to look at the vette chassis components.
They cariie F-body stuff also.
Luv the smell of NITRO in the morning.