muncie tailshaft questions

Reply Subscribe

Thread Tools

Search this Thread

Oct 24, 2009 | 09:51 PM

rcrchsr16

Thread Starter

Advanced

Joined: Jul 2009

Posts: 59

Likes: 0

muncie tailshaft questions

Hey out there! I have a question: what's the difference from a #3857584 tailshaft last used on a 70 Vette, and a #3978764 tailshaft used from 71 thru 74 Vettes? Thanks!!!

Oct 24, 2009 | 10:08 PM

...Roger...

Race Director

Joined: May 2006

Posts: 16,528

Likes: 53

From: Dayton, Ohio

Oct 25, 2009 | 09:21 AM

Duke94

Le Mans Master

Joined: Mar 2001

Posts: 6,640

Likes: 287

From: Ann Arbor Michigan

Looks like 27 spline vs 32 spline.

Gary

http://www.5speeds.com/casting.html

Oct 25, 2009 | 10:28 AM

...Roger...

Race Director

Joined: May 2006

Posts: 16,528

Likes: 53

From: Dayton, Ohio

A trick question huh ? ahhh

Oct 25, 2009 | 08:04 PM

rcrchsr16

Thread Starter

Advanced

Joined: Jul 2009

Posts: 59

Likes: 0

Thanks for the info Duke. I was under the impression that all muncies after 70 were the 32 spline, so I was thinking the difference was in shifter mounting or something like that. Should I be thinking the only difference- and spline count is a BIG difference- is the spline count, and not shifter mounting?
I can use a 27 spline muncie if I just get a driveshaft with 27 splines, it seems to me. Duh. And if there is any difference in shifter mounting, I should be able to get the right plate to adapt the earlier tail. Right?

I copied that page you sent me about casting numbers and thanks again!

Oct 26, 2009 | 06:46 PM

Duke94

Le Mans Master

Joined: Mar 2001

Posts: 6,640

Likes: 287

From: Ann Arbor Michigan

I agree, I don't understand why the spline count would change the tailshaft housing. There has to be some other change also.

Gary

Oct 26, 2009 | 08:06 PM

...Roger...

Race Director

Joined: May 2006

Posts: 16,528

Likes: 53

From: Dayton, Ohio

The yoke diameter increased in 71 as did the bushing. The 71 is the diameter of the pre 70s 400 turbo yokes.

Oct 27, 2009 | 10:33 PM

rcrchsr16

Thread Starter

Advanced

Joined: Jul 2009

Posts: 59

Likes: 0

Thanks Roger! Here's what I also found out after looking at my Volunteer Corvette catalog: shifter brackets are the same from 68 to 82, so one would have to say the mounting bosses on the tailshaft are the same. You all have been great!