69 Driveshaft length? - Pontiac GTO Forum
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post #1 of 2 (permalink) Old 12-21-2017, 08:35 PM Thread Starter
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69 Driveshaft length?

Need some direction from the masters everything GTO...

I picked up a project that was in process of being converted from auto to 4 spd. Current set up is 455 w/ Muncie M-22 and 12 bolt rear.
We measured from the end of the output shaft to the center of the rear diff. Thatís 57Ē. The driveshaft is short for this combo.
Does the automatic have a keyed output shaft? This yoke has a keyed part of the teeth in the ID. This Muncie does not have a keyed outputshaft.

So, what is the correct driveshaft and yoke?

Any input is appreciated
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post #2 of 2 (permalink) Old 12-22-2017, 06:27 AM
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Following are stock driveshaft lengths, all are measured center to center of the U-joints:
-'68-70 Muncie 4 speed : 56.00"
(small output shaft Muncie, has 5 bosses on tail shaft hsg for alum shifter mtg plate)

-'71-72 Muncie 4 speed: 55.375"
(large output Muncie, has 3 bosses on tail shaft hsg for steel shifter mtg plate, uses Turbo 400 yoke)

- '68-72 Turbo 400: 55.375"

Note, both the '71-74 Muncie 4speeds and factory Turbo 400 A-body driveshafts use the medium length '67-74 Turbo 400 yoke with 3R ujoints. GM saw fit to use many different versions of the Turbo 400 yoke, there are at least 2 versions of the long style Turbo 400 yoke, as well as a version of the late '70 's short style Turbo 400 yoke, these should not be combined with above factory length driveshafts.
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