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9" to replace 35c help

Taking my daughter's 35c out of her 95 YJ this weekend, she is putting a ford 9" in, and 4.88 gears, and an Advanced Adaptor HD SYE my question is about lining it up and drive shaft. From all the reading I did last night, it looks like if you put the pinion in peralel with T case then you use a standard drive shaft, and if you aim pinion at T case you then use a double cardon CV drive shaft. Either way she needs a new drive shaft, so what is the prefered way to do this. Don't want to weld on the perches, have shaft made up, hook everything up and have the first person look at it and say why did you do it like that? Greg

Reply to
Greg
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If she has a tall lift, a CV driveshaft is the way to go since it can better handle the angles and it'll run smoother. Technically, your descriptions of how to set up the angles are right on. From a practical sense, set the pinion angle 2-3 degrees under that of the CV driveshaft, not pointed straight up the driveshaft towards the t-case. This compensates for the rear axle's axle wrap (the pinion shaft will jump up several degree) during acceleration so the pinion won't point too high under acceleration and cause vibrations.

Jerry

Reply to
Jerry Bransford

Reply to
L.W.(ßill) Hughes III

Hi Greg, you're correct about aiming toward the pinion with an SYE setup. To do this on the stock axle, you can use degree shims on the spring perches:

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since you are swapping in the 9" you will be doing perch mods. Test fitthe axle with the spring perches clamped to the leaf spring. Rotate the axleas necessary and begin welding. This would be a good time to decide if youwant to do a spring over axle (SOA) setup for more lift... of coarse youwould have to do the front axle as well.P.S. don't forget to relocate your shock perches as well.-Brian

Reply to
Cherokee-LTD

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