How much should it be shortened....
- Thread starter Hell_Fish
- Start date
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cudaspaz
Well-Known Member
I would call your drivesgaft shop and ask them what exact measurements you need from them.
Different shops ask you for different measurements.
My local shop asked me to measure the very rear surface of the output shaft splines to the flat mating surface of the rear yoke which would be the center of the rear U-joint.
This measurement should be made with the car on the ground.
You should have at least 1.5" to 2 " of forward travel of the front yoke while installed.
This will assure you that when the pinion angle changes under load, the driveshaft has some room to travel forward.
Too much travel and you are gonna jam up your transmission guts or the thrust bearing on the engine.
Different shops ask you for different measurements.
My local shop asked me to measure the very rear surface of the output shaft splines to the flat mating surface of the rear yoke which would be the center of the rear U-joint.
This measurement should be made with the car on the ground.
You should have at least 1.5" to 2 " of forward travel of the front yoke while installed.
This will assure you that when the pinion angle changes under load, the driveshaft has some room to travel forward.
Too much travel and you are gonna jam up your transmission guts or the thrust bearing on the engine.
daredevil
Well-Known Member
Use the c dimensions here to find the difference from axle center to yoke center. i cant tell you not knowing what axle you had. http://www.mymopar.com/axledims.htm
daredevil
Well-Known Member
I,m assuming 1.6 inches if you replaced a 7.25 with an 8.25
grumpuscreature
Resident Curmudgeon
Have you already ditched the ball and trunnion drive line or are you planning on a hybrid drive shaft? If the shop doesn't know what you want when you tell them the situation, find another shop. All I have to tell our local drive line shop is "I am swapping an 8 1/4" into a '65 Valiant" and they know what you want. I once towed a car to their shop and drove it home an hour later (440/727 and 8 3/4" into a Feather Duster).
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