on early firebird & A-bodys through '69, I believe factory HD toploader 3 spd had its own length driveshaft. A Turbo 400 driveshaft in '67-69 Bird or A-body will be 5/8" shorter than same bodystyle with factory 2 speed or an early Muncie 4speed.
The Saginaw, Super Turbine 2 speed & early Muncie 4 speed all shared the same spline output shaft & yoke. Late Muncie 4 speed (original use 71-74) used the medium length Turbo 400 yoke. There are at least 8 different GM factory useage Turbo 400 yokes not including aftermarket yokes which accept Spicer 1350 u-joints. Shortest turbo 4oo yokes were used in late '70's Sevilles, longest in factory early BBC pickups, '70 Camaro's, & '70 Formula-T/A's. There is even an oddball med length T400 yoke used in '65 & 66 big Buicks. splines are different as is u-joint design.
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Buzzards gotta eat... same as worms.
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