Yep, matters not. So long as it's a th400 yoke you're good to go.
Yep, matters not. So long as it's a th400 yoke you're good to go.http://www.drivetrainspecialists.com/categories/slip-yoke/products/product-2465.html
It seems there are 3 lengths from center of cup to end: 5.5", 6.75" and 8". I guess you could use any as long as your driveshaft is the correct length and the right size u-joint.
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Specifics Wally. jeez.Hmmm, there are some of those yokes for trucks that are very odd and bolt to the output shaft, that might be a little different. The splined portion of the output shaft is fairly long and it is better to have more engagement of the yoke than less so I say it does make a difference.
The face of the yoke should have at least 3/4 inch spacing at ride height, not rear hanging while car is on jack stands height. The spacing should maintain through the complete travel of the rear, changing a slight amount as the rear travels through it normal arc.
Do not put the yoke tight to the back of the trans, it will fail and break the extension housing.