Pitman Arm Question

[Cranker]

Wht are the differences between 72 and 73 pitman arms? I am thinking it is the spline size. In all of my catalogs at work (moog,acdelco) they list them for a 73-74 but nothing earlier. I am going to put a new gear on it any way and have both of them avalible to me (actually in stock). If they are different can i go with a 73 gear and pitman and still use my other steering components to work?


NEW INFO:

Okay the difference according to the two different gears that i have in stock is that the 72 pitman shaft splines are 1.10" and the 73 is 1.20" that is the only difference that i can see. The steering shafts are both .62". My parts catalog from moog and acdelco both list them as 70-72 and 73-74. So will the 73 gear and pitman work with the 72 steering. only reason is i can get the 72 pitman arm from my work and save me money if not then i will get the gear box from me and a pitman arm from someone else.

 Thanks Crank

[Katfish]

I believe the only difference is the diameter of the steering shaft / pitman arm as you mentioned.  I converted my 70 to the police style box from a 80's Diplomat to get the firm feel.  Only other thing I had to change was to get a pitman arm for a 74 E-body.

All other steering components were left stock.

[Chryco Psycho]

somewhere between 71-73 the pitman arm reverses the 70-71 style has the centerlink under the pitman arm , 73-74 had the center link above the pitman arm with the pitman arm being longer to reach under the center link