Weekly Fun Question - Test Your 71-73 Mustang Knowledge

[cobra3073]

Some have indicated the questions have been "too easy" so this week's question is going to be a little bit different - - not as easy to google.

As some of you are probably aware, the mustangs built between 71 and 73, had two different axles available - - 28 spline and 31 spline. The question this week is:

What is the difference in length of the 28 spline axles from the 31 spline axles and what was the effective period of manufacturing for any changes?




I will see how long it takes to get the correct response for this one!

BT

 

[72fastback]

if i understand correctly the difference in length was 2 inches I think. Not 100% positive. And pre 71 axles had a concave oval in the middle of the flange. And post 71 didn't.

 

[cobra3073]

No, good try but that is not the answer I am looking for on this question.

Any more responses?

BT

 

[72fastback]

GOOGLE HAS FAILED ME HAHAHA


please specify what you mean by [ the effective period of manufacturing for any changes?} I am a little confused by the wording haha

 

[cobra3073]

This amounts to a hint:

There is a difference in length (of one or the other) of the 28 spline or 31 spline axles on the 71 - 73 mustang. This difference in length was reconciled after a certain date.

The question has to do with the difference in length between the two sets of axles and at what point was the "difference" reconciled.

I guess this one is a bit more difficult, huh?

BT

 

[72fastback]

A little more? yeah I would say so haha:-/

 

[MachSport72]

That's a tuffy........

I'll instead take pre-mao-facist farming and tool implements for $500 please Alex.

 

[72fastback]

That's a tuffy........

I'll instead take pre-mao-facist farming and tool implements for $500 please Alex.

hahaha

 

[Nance]

OK I"ll say 12-15-72

 

[cobra3073]

...and Nance, you are correct on the date of the change!

So what is the difference in length between the 28 and 31 spline axles??

BT

 

[Nance]

28 spline right axle from 12-15-72 31-25/32

31 spline right axle 31-25/32

31 spline left axle from 12-15-72 27-13/16

 

[cobra3073]

Considering the difficulty of the question, I will submit that you are correct in your response.

As far as the question is concerned, the difference in axles length prior to 12-15-1972 is 3/32" on the right axle.

Prior to that date, the length of the right axle on the 28 Spline was 31 7/8"...the left axle was 27 13/16" long.

The 31 Spline axles were consistent at 31 25/32" on the right axle and 27 13/16" on the left axle throughout the period.

If you do the math, 7/8" equate to 28/32" which means the 28 Spline right axle (31 7/8") is 3/32" longer than the 31 Spline right axle (31 25/32") made prior to 12-15-72 on the 71 - 73 mustangs.

GREAT job, Nance - - this was not an easy question!

Source: Hollander Interchange Manual

BT

 

[72fastback]

nicely done

 

[73vertproject]

Dang, missed out on last week's Question. Please sign me up for this week's contest. I want that Amazon Gift Card. LOL

Doc