What is the minimum amount a driveshaft can stick out of a trans without issues during driving. I thought I heard of 3/4" space between yoke/spline end and trans tail end by seal was desired.

Mine may be a tad too long for my set up (1/2"), but I'd love to use it....

I think I remember the guy who did my drive shaft saying 1/2"to5/8".

If that 1/2" is with full wieght on the axle, you'll be ok.
If it's with the axle hanging... :noway:

Depends on the trans...TKO can be touching the dust boot.

That's with the engine, trans in and sitting on all 4 tires.... I still need to add radiator, a/c components, antifreeze, alt, waterpump...so there is still some more weight to be applied.. If 1/2" is minumum, I'll monitor along the way.:thumbsup:

The standard amount is usually between 3/4" and 1" of travel. I use 7/8". Push the yoke in as far as possible and measure from a fixed point. Then pull the yoke out 7/8". The measurement for your drive shaft can now be made from u joint center line to u joint center line. With the TKO if you have 1/4" of machined surface showing from the dust boot extension yer good! This is with a Spicer yoke. Other yokes are not necessarily manufactured to the same dimensions and the 1/4" showing rule of thumb may not apply. The 7/8" travel allowance will suit most if not all suspension travel. Extreme lift or lower kits will need a little more attention.

Agree with both Jim's. My personal experience has been when the rear axle is dropped, as the body is supported and rear axle hangs down, I have seen an additional 1/4 inch of travel without the straps on.

You have to have the full weight of the car, not necessarliy the engine installed, in order to unstrap the the yoke and push the d/shaft forward to clear the pinion yoke for removal.

Question: If you're about a 1/4" lacking, is OK to machine that amount from the yoke or should the driveshat be shortened? Just curious.

I have a spicer yoke coming out of my Muncie attached to the driveshaft. I can pull it into the muncie all the way so it 'bottoms', pop the shaft into the rear end yoke and then pull back to seat in the rear end yoke.

Reads good to me.

Question: If you're about a 1/4" lacking, is OK to machine that amount from the yoke or should the driveshat be shortened? Just curious.

Al
If I'm understanding your question correctly, the drive shaft needs to be shortened. The output shaft will usually bottom out on the inside of the barrel before the outside trunnions hit the end of the case. It really depends on the tranny output shaft length.

In my case, it bottoms out on the outside trunnion first.

What ever is bottoming out should be 3/4" to 1" away from bottoming out with the car on the suspension from the start.