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I am swapping out an FMX with a 4-speed toploader. Can anyone tell me the proper amount of engagement between the output shaft splines and the yoke splines? I need to measure the driveshaft length to have it cut and balanced. The toploader did not come with a yoke so I'm starting from scratch.

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I push the yoke all the way in, and make a mark on the yoke at the rear of the transmission. Then, pull it out 1" and mark the yoke again for reference.

Ask the person who is going to make your driveshaft how they want it to be measured.  Typically, it is from centerline to centerline of the u-joints.  A CRITICAL step is to make sure the weight of the car is on the rear suspension when you do the measuring.

 

 

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