Rear End Identification Help - Pics

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What kind of car is the rear axle going in?

I just put a 3.00 (with 30" tall tires) in my 32 replacing the 3.70.
The 3.70 is a great performance gear, but out here on the long desert highways the 3.00 is very nice . . . even in town.

Looks like a mileage increase as well, but the only mpg check I've done so far was running down the long grade(12 miles and steep) to Laughlin.
About a one mpg improvement there.
Running 65 - 70 mph fwiw.

Guessing perhaps a two mpg improvement on the somewhat flatter runs to Vegas or Prescott etc.

I have a 3.25 locker in the 31 on 32 rails roadster project and with 28" tall tires it should work out fairly well on the highways and in-town.

Fewer revs per mile than the 32's 3.70's and more rev's than the 3.00 along with alloy 31 splne axles.

The 31's a little more performance oriented and will have about 40 more HP over the 32 - both with 462" Buick engines so it should work well.

Fwiw, the 32 is a 2400# car (empty, but full fuel etc.) and runs 28 spline axles.

The big tires with their 8" tread width are fairly soft and grab harder than the hard slicks from back in the day.
They did well at the airport 1/8 mile drags and I did ok against a couple of big slick doorslammers.

Open diff as well, but the little car launches fairly hard all things considered.

I had the axles out a few months back and they haven't twisted far as I can tell.

I've also run 28 splines in a 62 Ford wagon with a modest build FE 390 and 3-speed stick (all-synchro).
No probs with it either.

Couple of my pals run 8" axles, one under a full fendered 29 A roadster with warmed over 327.
Drove it hard and no probs....

 

31vicky, that locker does look just like mine the suspense is killing me too.

C9, this is going in a 56 customline. It will have a pretty hot 347 stroker motor in it. Its never been run, so dont know HP yet really, hoping in the 400 range. the engine, heads, cam, were all designed around a 5 spd manual and 3.73 gears, not that it cant be different of course.

So I was hoping this would be 3.55 or 3.80, maybe even 3.25 worse case, but 3.00 just dont know.

Either way I guess I could just throw in a new ring/pinion for the correct ratio and roll with it. Or I could seek a 9, although VERY hard to come by around here for under a $1000 with posi. Got $130 in this one, was hoping I could run it.

Now, here is a pic of trac lok and detroit, they look about identical in these pics

http://www.justdifferentials.com/index.php?main_page=product_info&cPath=24_48_293&products_id=2685

http://www.justdifferentials.com/index.php?main_page=product_info&cPath=24_48_293&products_id=660

 

Thanks Little wing

Ford USA D1AW 4210 A+1

Shine a light anyone?

 

It's an 8" and there is no such thing as a factory 3.73 in an 8" or 9". Some 9" rear ends came with 3.70's. 90% of 8" Ford rear ends are going to have 2.79's or 3.00's. A few came with 3.25's. I have also seen a few Mustang II's with 3.40's. I have only run across one set of 3.55's in 25 years of building rear ends.