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i have a 91 yj. i am installing 4 inch sky jacker lift springs and a soa.does any one know what pinion angle degree i will need to set it at?front and rear axles.i am also doing a 1.5 transfer case drop
 

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Your using 4in springs with an SOA? You know thats 9.5in of lift right and a t case drop isnt enough you will need a SS SYE. As for the angle after you install the sye and cv drive line front and rear. The yokes front and rear should point to the transfer case. With my 1.5in SOA my rear angle is like 14 degrees pointed up. My front is 6 degrees. Also are you thinking of stretching it? If not you might want to look into moving your front axle forward and rear back for better driveline length and angle
 

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Need to do some research first. Pinion angles are critical and you should go to Tom Woods page halfway down grey banner Technical Information and Sponsorship's. There is enough there to keep you busy and get you smart. The T-Case drop is negative and defeats some of the purpose of all your lift and may do nothing for your pinion angle.

Read some of the SOA thread builds here. Some are amazing and have pics to help guide you through the process.

It will be a great mod and give you some great clearance and a great looking YJ when done.

So a little research get your plan together and when it is all mocked up and ready for a driveshaft you can get an angle finder out and tack in the spring perches. Should be 2 degrees lower than the angle of the driveshaft. You are also going to need a traction bar for preventing severe axle wrap.

There are some great kits around for the conversion so look around and read what others have used.

Then there is the steering setup which will be interesting.

Don't let anyone discourage you because a properly done SOA will make for a badass YJ!!!!
 

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I personally prefer 5° lower then the Tc on the rear....because the rear pinion will want to clime under load.
And 2° higher than than the Tc because it'll want to drop under load...
This is just what has worked best for me....I have done many D44 & D60 SOA..
I would also suggest using the three hole porches so you can at least gain a few much needed inches to the wheelbase...
 
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