Finding Centerline 72 GTO GM A body to square up rear end

[CraigG]

Hey Everybody,

I'm trying to find centerline on 72 GTO With stock frame for measurements

Would it be halfway between?

Outer rocker panels
Center of transmission or transmission crossmember
Center of stock frame

Thanks, Craig

[cordoba13]

most cars I have seen have offset for steering box/engine clearance, not sure about GTO?

[CMcAllister]

I would drop a string line from 4 or 5 different places on each side of the frame, from front to rear. Obviously use the same point on each side - suspension mounting points, factory locator holes, etc. Mark on the floor and find the center. If they all don't fall on the same line, double check your locations. And hope the car hasn't been hit.

Driveline is offset to the right. Don't recall the measurement but should be parallel with the chassis centerline.

[mike britt]

If you're trying to find centerline of the body, use a plumb bob from the trunk lock to the floor and the center of the grill to the floor.

[rallye bob]

Originally Posted by CraigG

Hey Everybody,

I'm trying to find centerline on 72 GTO With stock frame for measurements

Would it be halfway between?

Outer rocker panels
Center of transmission or transmission crossmember
Center of stock frame

Thanks, Craig

https://www.chevelles.com/media/68-7...ensions.15066/

[Troy Henderson]

Originally Posted by rallye bob

https://www.chevelles.com/media/68-7...ensions.15066/

A nice way to do it is to use the holes in the bottom of the frame shown in the link above. Then, you can drop multiple points down with a plumb bob to the ground on both sides. Measure across to get centers than take a string or laser and draw the centerline thru them.