Topic: rear end identification...what is it??

[messymach1]

the rear end is in my 73 mach 1..tag reads.
                             EST       2JB
                             75  9       951C.
  THANKS FOR YOUR HELP !!!

[66GTKFB]

My Ford Car Parts book only covers to 1972 so it is not much help. What I recognize is "2JB" which decodes as 1972, September, second week, and conforms to a 1973 vehicle. Code "EST" should be the rear axle code, but thru 72, they all start with a W. I looked at other Ford codes, engine, transmission, steering box, in case the tag was relocated but none start with an "E". Your best bet is to locate a Ford dealer and see if they have a 73 and up parts book.
Jim

[ol dirty doug]

Standard equipment was a 351W 2V Windsor motor with a 3 speed manual transmission, and a 9" 28 spline open rear axle. A 351W 4V was optional as was a 390 4V, and the huge 428 4V Cobra Jet or with the "drag pack" option, the 428 4V Super Cobra Jet. A 4 speed manual or 3 speed FMX (small block)/C6 (big block) automatic transmission was optional, and the 428SCJ added a cast iron tailshaft in place of the regular aluminum one to the C6. A "traction lok" rear axle was optional, and the 428 CJ/SCJ included a "traction lok" with a 3.91 or 4.30 ratio, 31 spline axle shafts and a nodular case. In 1970, the 3.91 ratio was a "traction-lok", while the 4:30 ratio was a Detroit locker. Mach 1s came with upgraded suspension to varying degrees dependent upon powertrain choices. Big block cars had front shock tower reinforcement, thicker sway bars (no rear bar for 69), and heavier springs and shocks. 428 CJ/SCJ 4 speed cars also came with staggered rear shocks.

[66GTKFB]

What year are you refering to? The original question was for info on a rear axle tag on a 1973 Mustang. The "big" engine in a 1973 Mustang was a detuned 351CID called a Cobra Jet.
Jim

[Soaring]

Yeah, there were no 396's, 427's, or 428's in 1973.  That was after the gas crunch took place.  I have no idea what that rear end is.  Jim is the master of codes on here, and if he doesn't have it, nobody does.  If I could see a picture, I could tell you if it was an 8" or 9" though. 

[messymach1]

I know its a 9 inch..and I coulnt find a listing for it either..most of the dealers around here only want to sell new parts and are pretty much not wanting to do any more than they are forced to....any other ideas?