[murrsue]

I need to set up a driveshaft for a 700r4 to an 8.8 rear. I have to find a driveshaft from the wreckers and take it to a machine shop to put the rear u-joint on. I'm wondering how far in the sleeve of the front yoke should be slid into the tailshaft when I figure the length. Presently there's no body on the chassis so the rearend is sitting higher than it will sit with the body weight on it.

[astroracer]

If you have a tailshaft yoke slip it into the tranny. Shove it in all the way and then pull it out about an 1 1/2. This will give it the required wiggle room. Measure between the u-joint centerlines for shaft length.
Mark

[johnsongrass1]

Yes agree, but you need the rear axle to be resting at ride height.

OR compensate your measurment's by calculating how farhte rear movesforward when the suspension moves thrugh the entier arc of the rar trailing arms. Unless it's on full leafs. Then you need to figure out how much axle wrap will turn the pinion away from the axle, pulling the driveshaft out of the trans. If you need a extra long yoke, you can get one up to 8 inches. It's cheaper than building a driveshaft.

[murrsue]

I guess I'll put a couple of big guys on the back end, pull the yoke out 1 1/2" and measure. Thanks guys.