I know that this rear is a gm standard 10 bolt, and Pontiac used it in the 64-66 gto, tempest, and le mans.
Newer GTOs are not one of my strong suites... It appears the axle stub refers to axles for independent rear suspension cars. Check out the link.
You should be able to use a 12 bolt. Check your spline count. Standard spline count is 30, you can change the axles to a 35 spline and gain as much as 89% strength. There are many vendors to help you with ordering the right parts. Let them know your use and horse power.
5 X 4.75
Yes. It will bolt right in with 1968 motor mounts.
3.46 for auto and manual transmission.
"66 rear fenders and '67 are not the same. Those are called Quarter Panels.
No, Mustang wheels will not fit a GTO the bolt pattern is 5 x 120.65 mm (4.75 inches) on a GTO; it's 5 x 114.3 (4.5 inches) on '94-up Mustangs. Prior to that, the Mustang had a 4-bolt setup. Lastly, the wheel offset is different on each car (offset might be cured with spacers, but it's a mute point with the difference in bolt spacing).
Check to make sure the rear axle has not been swapped. Factory pattern was 5 bolt with a 4 3/4" center. 5 on 4-3/4 Buick - Regal, Century, Special (most mid-size) '64-'80's Chevy van Chevrolet - all (exc as noted elsewhere) '49-'89 Corvette all Corvair '65-'69 5-bolt GM compact and midsize Oldsmobile - 442, Cutlass, F-85, Toronado (most mid-size) '60's-'80's Pontiac - GTO, LeMans, Firebird, Grand Prix (mid size) '64-'80's
It's wheelbase (width) was 115 inches and it's overall length was 206.6 inches.
It's wheelbase (width) was 115 inches and it's overall length was 206.6 inches.
Right hand thread