Chevelle rear ends

[sixt9rsx33]

Will a 67 Chevelle 12 bolt physically fit in a 69?

[Mr70]

Yes,it should bolt right in for you,no problem.But be advised a '67 Chevelle rearend is just about 5/8 inch narrower on each side than the 68-72 rears...so you'll have more room for a fatter tire on the outside part of the rim then.

Here's some technical stuff that I gathered before doing a swap on 1 years ago,that may or may not help you:
*1964-67 chevelle rear end housings measured 56.5 inches from flange to flange, and 60.5 inches total length with the drums in place.

*1968-72 chevelle rear end housings measured 58.5 inches from flange to flange, and 62.5 inches total length with the drums in place.

*Rear spring mounting pads on the 64-67 rear ends used a flat pad with a hole drilled in the center, the 68-72 rear ends have a circular spring mounting pad, that are 3/4 of an inch higher that the flat pads.

*1967 was a transition year in which the A-body cars might have a 64-66 style rear end, a 68-72 style rear end, or a "hybrid" rear end that will have the 58.5 inch width, but will have the early spring mounting pad and trailing arm brackets.

*Rear upper control bushing eyes differ,and the position of the bushing eyes will differ. 68-72 rear end housings will have a 3/8 inch forward positioning,which is farther than the 65-67 rear ends.

*1965-67 upper trailing arms are 1 inch shorter and will not fit into 68-72 A-body cars, 68-72 A-body cars have longer upper arms and when switching upper arms the pinion nose angle will be affected.

[big gear head]

I'd like to correct one thing here. The width of the '64 to '67 Chevelle rear end is 60 1/4 inches with drums and the '68 to '72 rear end is 61 1/4 inches with drums. The axle length of the early rear ends is 29 1/8 inches and the later axles are 30 1/8 inches. I don't know how that 62 inch width got started on the internet, but it's everywhere and it's not correct. There is exactly 1 inch overall difference in the early and late Chevelle rear ends.

[bigsixman]

Originally Posted by big gear head

I'd like to correct one thing here. The width of the '64 to '67 Chevelle rear end is 60 1/4 inches with drums and the '68 to '72 rear end is 61 1/4 inches with drums. The axle length of the early rear ends is 29 1/8 inches and the later axles are 30 1/8 inches. I don't know how that 62 inch width got started on the internet, but it's everywhere and it's not correct. There is exactly 1 inch overall difference in the early and late Chevelle rear ends.

I agree.

[sixt9rsx33]

Mr. 70

You may recall we discussing in an earlier thread the rear end in my 69 L78. The build sheet calls for a KK there is a CF 3.31 installed now. The date code on the axle tube aligns with the build date of the car, but the casting number of the differential is for a 67. (3894939) I have caught up with the second owner of 44 years and he states he never changed the rear end. I am the third registered owner. I assume that the rear end must have been changed by the original owner. I am the third registered owner. There were two flippers before me. There is zero evidence of this rear end being touched in the recent past. What I am trying to figure out if this rear end is a 67 by visual glues, and you guys have given those to me. I appreciate it. I would like to find a correct dated KK for the car if possible.
Thanks

[JpMotorsports]

Man I'd love to find a solid 67 12 Bolt for my 67

[big gear head]

Many of them have been modified and put under Camaros. The '65 to '67 Chevelle 12 bolt is the same width as the '67 to '69 Camaro rear end.

[L72Biscayne]

Jpmotorsports I sent you a private message.

[sixt9rsx33]

JP Motorsports, happy to sell you this rear end if I can find a KK for my car.

[JpMotorsports]

Got you PM's Thank you guys!