I have a true early 1965 factory GT fastback that has a 9 inch rear end in it. Only info I find is that Hi-po cars had 9 inch rear ends but wanting to know if GT's could have a 9 inch from the factory or were they all 8 inch? Thanks
All '65 V8s were all 8" unless they had a K-code motor, GT or not. But lots have been swapped out over the years. I did it myself, to my '66 GT fastback, many years ago (since then I have switched back to the original 8" housing). If you have a true early Mustang 9" rear (with the narrow axle tubes), a K-code guy might be willing to pay a lot for it.
Yeah, I'd like to see photos of said 9" rear axle as well.
Probably done long after the car was built. I'd find
it hard to believe the assy line would slip a 9" in if they
were out of 8's. I've seen lots of slow ratio steering boxes
where they didn't belong and a few ft sway bars over the
years though.
If the tubes are straight then it's an 8 inch. Tapered tubes (i.e.. tubes leave the diff as one diameter, then partway out "step down" down a smaller diameter before they reach the brake backing plates) indicate a 9 inch.
ALL 65-66 Mustang rear axle tubes were stepped-down at the springs, 7", 8", and 9". ALL 67-73 Mustang axle tubes were straight.
There are no "casting numbers" on the housing. The cast carrier, of course, does have numbers. However, this is a 9"-
It's just not a 65-66 Mustang axle.
The rubber pinion bumper on your car is mounted on the floor of the car. The steel plate is the floor-mount type, i.e., your car left the factory with an 8" axle.
What I see in Pictures;
1. the bulge of a 9" gear in the rear of the center section.
2. what appears to be a C7AW-E 9" center with the fill plug on the side, a C7AW-O pinion snubber,
and a floor mounted GT snubber plate and bump.
3. the gradual step down of the axle tube as seen on a 9" axle housing.
If you wanted to get some casting numbers off the housing, the pinion snubber and a picture of the axle ends, at the brake drum, you would know for sure. Brian
If you read my initial post I know I have a 9 inch, no doubt about it. I'm just trying to find out if 65 GT came from the factory with 8 inch only or if 9 inch was ever used.
Your 3rd member is from a '67 or newer (ID'd by fill hole).
Your picture is hard to see. If your axle housing has a hump in the back center those were not used in 1965 or earlier. Transition to hump occurred in 1966 production.
Well I am easily confused but doubtful that a 65 GT ever came with a 9" axle assembly unless it was also a ' K ' code car. In this case it appears to be a 1967 9" axle housing in your 65 GT. The date castings are, on the center case, right/passenger side, on the pinion at the outer forward rim and the axle ends may have a C7AE casting. Brian
It's definitely a 9", but no it never came in an "A" code car. It could be a old Ford rear from the 50s, or a Granada/Lincoln rear housing , if not cut. Big bearing or small bearing ?
No 9" in a GT, BUT ! BUT ! I put 9" rears in all my 65-66 GT's in the 70's and 80's. I know other guys that bought the 65-66 9" housings or 57-59 ford housings and put them under their C and A code mustangs. I used 57-59 ford rears and 67-70 housings that I narrowed 1" on each side. I sold the rear out of my 65 K because i never liked the 65-66 necked down housing.
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