Did your driveshaft yoke clearance increase by 1/2"? You said you thought you may of already been sitting at 1" , but wasn't sure.

Not finished yet. With the pinion nose down t might be a wash.

Ran into a snag. Heavier springs set the rear of the car higher, about 1-1.5" higher. I don't like it. There coming back out tomorrow and i'll wait til the other front sections at the shop get done.

Picked up my original front sections from the shop. Got them installed. With a 6* shim i now have 4* pinion to shaft angle. Gained some tire clearance, but now may need a new drive shaft. The slip yoke is 1.75" from being all the way into the tail shaft. Didnt measure the yoke, but i would guess its 6 or 7" long where it goes into the tail shaft. That still gives me 4-5" of sline contact. Enough?

That's borderline.

I agree it is borderline but not that you could not drive with it.There will be a vibration if there is a real problem and could try it going slower.I think the runout was .060 on the slip yoke

The splines don't start on the inside of the yoke until about a 1.25" or more in. So you have a lot less spline engagement then you think without truly measuring. Your borderline all right. You probably have less then 2",s of spline contact

I think my Dana yoke has splines to the opening,just saying

That could be, thought ive seen a few myself like that. But remembered that a lot don't, checked two that I have and both are recessed by about a 1.25/1.5 or so. Figured he should check his to make sure.

I'll have to check that, but i don't think so. I had to get the splines lined up before the yoke would even start to go on the trans shaft.

I figured i can street drive it as long as it doesn't vibrate and i don't think it will. It fits very snug. Whats the worst thing that could happen at the track?

It's far enough out of the shaft to wobble and then BOOM out goes the drive line.

Just some helpful pics<I got the yoke from Mancini

Thanks for the pic. Looks like only 5.5" long. Mine is a spicer as well. Looks like the one in the pic has way less spline contact than mine.

Less contact how?The output goes 1" past the seal/shine on the yoke.If yours is longer it may be splined to the tip like mine.I don't know.

I only have about an inch of rust showing on mine.

I checked mine and I only have 2 1/2" of spline contact with the output shaft That is half of the total spline in the yoke.I twisted the spline and just replaced the yoke and now think I mistook a longer drive shaft when the splines were just stopping the yoke from going on more.

Yep mine is worse than yours.
ps:I will make the drive shaft longer instead of taking out the 1" shim that moved the springs back.

I have a rubber dust boot on the end of my tail shaft and the main shaft protrudes about a 1/4" past that rubber boot as well.

I know of two sizes of dust boots, theres a shorty 1" boot or so and a longer 2.5" boot or so. I'm sure they are mated with the correct yoke. Not sure about the specifics about the differences. But originally these were and are street production cars.

I myself used the shorty boot to help achieve about 3/4 to 1/2" clearance from bottoming out the yoke. Ive been there with the wider clearances of the driveshaft wobble and actually loosing one. Was fortunate that I didn't catapult when I lost the loose clearance one.