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The 'stang we have came without a driveshaft.
It was a 289 3speed, it will be a 428 with a 4 speed toploader or more likely the 5 speed TKO 600 from DHP with the shortened input shaft, so I can bolt up to the Z code bellhousing that I have.

Has anyone there got this combination? I understand this will allow me to use a stock length big block drive shaft.

Thanks for any insight
 

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I'd say you should get out the measuring tape.
IIRC, the way to figure the correct length is to install the yoke and measure from the front u-joint saddle back to the diff yoke...then subtract 1" to get your driveshaft length.
 

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The factory 67 289 hi-po, 390 & 428 driveshaft for a 4-speed was 50 1/64" long (center to center of the u-joint yokes), 3" diameter.
 

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Install the yoke into the transmission as far in as it will go. Now, pull it out 1" - 1 1/2". With the weight of the car on the axles, measure from the center of the rear end U-joint, to the center of the U-joint on the yoke installed in the transmission.

http://www.streetortrack.com/images/driveshaftmeasurment.jpg
 
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