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Author Topic:   driveshaft clearance
posted March 08, 2004 09:07 AM
We just replaced our 3-speed with a falcon and the driveshaft is a little too long now. (31 1/2")

We are going to get it shortened, but wondering how much. We are running a 3-link.

With the car on jack stands and the rearend resting on the underslug, the driveshaft JUST barely fits in. We jacked the rearend up close to where it would be at ride height, and that gave us 3/4" between the seal and the base of the yoke. At true ride height, I am thinking it will be 7/8" or so. Any ideas how much we should cut off?

We have the short yoke. The shaft on the yoke is 3 1/2". The falcon manual says 1" minimum clearance. I DEFINITELY don't want to cut the driveshaft too short! From what I have seen, most guys are running a 30 1/2" driveshaft. If we cut a full 1" off, that would only leave a little less than 1 3/4" of yoke inside the tail at ride height. Is that enough? The clearance should only lessen from that point on (axle wrap).


posted March 08, 2004 11:21 AM
if its snug when the car will "hike" up as it sits on stands i'd take a good 3/4 off it to be safe

posted March 08, 2004 11:32 AM
move your wheelbase back and inch. will help on slick tracks also.



posted March 08, 2004 11:45 AM
dluna, we just replaced our powerglide with a falcon in a 4 link dirt works. We used our old drive shaft (29 1/2" with 6" slip yoke)and had the tail section bearing come apart in the falcon. It looked like the front edge of the slip yoke caught the bearing retainer and destroyed the inner race. The inner edge of the bearing is a good 1 1/2" from the rear edge of the tail section. After talking to Dirt Works, we have lengthened the drive shaft to 30" with an extra long small yoke we got from Smileys. It allows 7 1/4" of travel. I'm not sure what length drive shaft you need for your 2-link, but I would highly recommend the longest slip yoke you can find. We need about 3 fingers of yoke to housing clearance for our 4-link, but I would think 2 fingers should be good for a 2-link. Hope our experience helps you.

posted March 14, 2004 09:30 PM
the way we check it and were told to by others. is to jack up the car right in front of the drivers foot box, on the left frame rail, pick it up till the lf is way off the ground and the lr is almost(super close) to coming off the ground. then you need at least a thumbs witdh of shaft still sticking out.
pretty easy way i guess. seems to work well.

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