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Determining correct driveshaft lengths

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rocketeer View Drop Down
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    Posted: 26 Dec. 2009 at 11:54am
Willys used a different method for measuring the length of a front driveshaft than they used for measuring the length of a rear driveshaft. Since the only mention of method shown in any manual refers to the method used for the fronts, correctly determining the rear length can lead to confusion.

Factory blueprints show that the front driveshaft is, in fact, measured from center of u-joint to center of u-joint.

However, the blueprint for the rear driveshaft does show a different method of measuring. On the blueprint the rear driveshaft is measured from the center of the rear u-joint to the front edge of the front flange, not to the center of the u-joint. Willys left that little bit of info out of the manuals.

So the correct way to measure your driveshafts when trying to determine what is correct for your vehicle is:

FRONT - center of u-joint to center of u-joint
REAR - center of rear u-joint to front edge of forward flange

Here's a corrected diagram. It's a jpg image and can be saved for reference.



Larry

Edited by rocketeer - 26 Dec. 2009 at 11:58am
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samcj2a View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samcj2a Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jan. 2011 at 7:41am
Good information!
Sam

1946 CJ2A   15292 ACM    6678

1947 CJ2A 122031 ACM 111989

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