What is the correct procedure for measuring custom driveshaft length? I have read to bottom the transmission slip yoke and then then slide out 1”. Then center to center of each U joint for the measurment. Is this true for all applications? I believe my driveshaft is tight however I have driven several seasons without issue.
Driveshaft measurement
- Thread starter Baker7888
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What 565bbchevy posted is spot on. The only issue that it doesn’t consider is if you have an extremely large amount of suspension travel. But for most of us that aren’t on air ride that allows for 3-6” of suspension travel, his link will work perfectly.
At no point in the suspension travel can the trans yoke bottom out which puts forward pressure onto the trans’ out shaft.
At no point in the suspension travel can the trans yoke bottom out which puts forward pressure onto the trans’ out shaft.
I’m not sure what to do with this, looks like an order form? I have a driveshaft with slip yoke installed that i suspect to be too long. How much play should the slip yoke have with the suspension loaded?
your initial question was "What is the correct procedure for measuring custom driveshaft length?''.... 565bbchevy likely posted that as an aid for you to print out and use as a very useful tool to properly measure for one and a good way to tell a local driveline shop exactly what it is you're looking for. I've done just that myself and it's fool proof.
Ok gotcha. Guess i should clear things up. I have a driveshaft assembly that i suspect is too long. Perhaps I have to separate the yoke from the driveshaft but I guess what I am really asking is how to determine how far the yoke should be slid onto the output shaft, at rest, with suspension loaded. If i knew this, I could determine if it is too long or not. It currently fits but is tight. If in fact it is too long i may attempt to shorten myself but will cross that bridge if needed.
Take the straps off the rear U joint, tape the U joint so the caps can't fall off. Pry the shaft forward till the front yoke bottoms out in the transmission and see what kind of clearance there is between the rear U joint and the yoke on the rear axle.
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I tried that once. It doesn't matter how true you cut or weld it, it HAS to be professionally balanced. I even went to the trouble of having a pro welder (friend) do the reconnective surgery and it still took out the trans when it jumped ship. Once the death wobble started there was no stopping it in time.
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