Thread: what is this FORD rear end called?

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we installed this ford car 9" rear when we built my 27 rod.
the fill plug was added by someone in this rears past.
what is this rear end called?
THANKS FELLAS!

You showed everything but what I needed to see!!!! Look on the bottom bolts where the center section bolts into the housing... If you can get a socket on the bottom 2 bolts it's and 8" Ford, if only a wrech will fit, it's a 9" Ford.....

With seeing that cast nose on the pinion support it makes me think it might be an 8". But like Dave said, you need to look at those 2 lower studs on the housing. Every time I found an 8" I'd get excited. Oh wow, a 9" with a nodular case! Oh wait, it's only a 8". Haha

Sorry guys, it's neither an 8 or 9 incher. It's that odd ball 9-3/8 that Ford used on some pick ups and cars with 429/460s and Lincolns

See the very first photo here: Kevinstang's Ford Nine Inch Differential Page +

Supposedly a 9" center section will fit though never tried it.

(The guys at Hotrodders.com didn't know either)

If it is the 9 3/8", they do fit into the standard 9" housing, might have to grind a bit on the housing for the ring gear to clear, but that's about it.

Originally Posted by Dave Severson

If it is the 9 3/8", they do fit into the standard 9" housing, might have to grind a bit on the housing for the ring gear to clear, but that's about it.

I think all you have to do is grind a relief the gasket flange of a 9" housing to fit a 9-3/8 ring gear(or so I've been told) I also think the 9-3/8 are all 31 spline, but, again, don't know from experience, only hearsay.

My recollection is that most of the 9-3/8 gear ratios 'suck', i.e. 2.56/2.69 or thereabouts. Great for prairie cruising/economy behind a C6 in your 429/460 powered Town Car or Thunderbird but not much for performance

Originally Posted by IC2

I think all you have to do is grind a relief the gasket flange of a 9" housing to fit a 9-3/8 ring gear(or so I've been told) I also think the 9-3/8 are all 31 spline, but, again, don't know from experience, only hearsay.

My recollection is that most of the 9-3/8 gear ratios 'suck', i.e. 2.56/2.69 or thereabouts. Great for prairie cruising/economy behind a C6 in your 429/460 powered Town Car or Thunderbird but not much for performance

I found a good use for one of the center sections, anyway... It's the one I use for mockup on builds, and when I narrow housings!!!! The aftermarket now has some very good ratio's in 9.5" ring gears, but they're made for aftermarket center sections. They are a bit stronger when you start getting into the 1,000 + horsepower builds, might be a consideration. But yeah, the factory 9 3/8" certainly isn't anything to write home about, especially with all the good parts available for a reasonable price thru the aftermarket suppliers...

i was under the impression that it was a 9" rear
the 3.00 gear i put in it was for a 9 incher.
when i asked what is it called
i assumed there was some odd name mechanics used for variations on the 9 inch rear theme