Topic: does my 1972 mustang have a 9inch rear end?

[bfsniff]

 I want to put 4:11 gears in my rear end but dont know if its a 9 inch or not?  Can anyone help? or give me an idea how to identify it.

thanks alot
  Brock

[66GTKFB]

According to the Ford Car Parts, Section 40, all 1972 V8 rear axle housings were 9 inch. There should be a metal tag attached to one of the retainer stud from the housing to the carrier that tells the axle type, build date, plant and gear ratio.
(Note: That tag is the first item discarded in a rebuild.)
Jim

[Soaring]

There is a quick way to visually see if you have a 9" or not.  Look at the back of it, and if it has a "hump" it is a 9", but if the pumpkin is round, it is an 8".  This is a 9".....see the hump?

[bfsniff]

ok thank you, it is a 9inch.    now whers the best place to buy some 4:11 gears,  i looked on summit racing and it cost 149$ , the cheapest i could find so far...

thank you
Brock

1972 silver mustang fastback Mack 1

[66GTKFB]

There's a saying from the 60's - "Speed costs money, how fast can you afford to go?"

[Soaring]

You could always bid on them.   
http://cgi.ebay.com/ebaymotors/9-inch-ford-4-11-gears-imca-ump-dirt-car_W0QQitemZ140297046866QQcmdZViewItemQQptZRace_Car_Parts?hash=item140297046866&_trksid=p4506.c0.m245&_trkparms=65%3A1%7C39%3A1%7C240%3A1318