Re: Lifted 87 YJ Axle Degree Question - Jeep Wrangler Forum
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Old 11-14-2011, 07:56 AM   #1
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Re: Lifted 87 YJ Axle Degree Question

I have an 87 YJ that my son and I are doing a complete modification to and I have a question. The YJ has 4" lifted leaf springs, we did an SOA lift as well with 1-1/4" lifted shackles, all over a Dana 60 front axle and a Dana 70 rear axle out of an 87 F350. . The question is that I have 8 degree wedges between the springs and the axle in the rear, should I also install the same wedges in the front or will that totaly throw off my Caster and have a negetive effect on my stability or stearing? Should I just leave the front without any wedges and deal with the angle of the driveshaft into the pinion? The Dana 60 in the front already has a high pinion, so that has helped with the angle a bit. Looking for any suggestions.

Thanks
Walt

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Old 11-14-2011, 09:26 AM   #2
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Not sure on the front, what is the angle between the output and the diff? 4" plus 1" seems way tall for a soa.. what size tires will you be running?

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Old 11-14-2011, 09:35 AM   #3
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assuming you are welding the perches on, you can set the pinion angle with the perches as well....rather than using wedges, unless you already have them welded on...pics would help, 10" of lift....thats some fun stuff right there, easily clear 40's, probably 44's, heck maybe 50's with some trimming...those axles should be good for whatever tire you want to put under a jeep...lol
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Old 11-14-2011, 09:41 AM   #4
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DO NOT install wedges in the front....it will drive squirley and wear tires out bigtime. Just curious why you have them in the back? You should have just been able to rotate the housing up before the perches were welded on them. Your having problems with the front shaft angle? Still using the 231 transfer case? I have used 6 in springs on a SOA before without issues so it can be done.
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Old 11-14-2011, 05:42 PM   #5
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Your front drive shaft is much longer and can a little more of an angle without
vibes. I don't agree with don't use shims up front. I was told not to use
anything more then 4 degrees up front. I'm running 4 deg shims up front with
absolutely NO problems. The shop that aligns my rig also does Big Rigs so
they know what they are doing and have the right size cam bolts to do it
correctly.

Shims are sold in sizes up to 12 deg. They are not the best solution to
correcting your pinion angle but is acceptable. My rear is out 12 degrees as
of now. I will be upgrading to an explorer 8.8 and don't want to take the time
to grind and re weld perches on an axle I will only be keeping another 4
weeks. I put a double T-Case drop and 4 deg shims in my rear temporarily to
correct pinion angle until I do my axle swap.

When I had my 4" spring lift I ran 4 degree shims for many years

I now have a 5" BDS lift / 1" shackle / 1"body / flatty front and trimmed rear
fender flairs. I just had it aligned and it drives straight as an arrow.

Everyone beats up aluminum shims and I ran a set of 4 deg shims now for
over three years. I just inspected them when I re installed them when I went
from my 4" RC lift to my 5" BDS lift and they were in great condition.

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Old 11-14-2011, 08:18 PM   #6
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I am not yet sure of the angle, the frame, axles and springs are being painted this week and I will be putting it together next week. I will be running 38" x 15.5" tires.

I am using the existing perches on the F350 axles. I actually welded another entire frame to the outside of my existing frame and that gave me the spacing that I needed to run the new axles without making any modifications to the axles.

I have replaced the engine with a 351 windsor along with a C6 Tranny and an NP205 transfer case. I do have a drop transfer kit installed and I have the engine mounts up just slightly to help with the angle.

Thanks for the help and suggestions. When we are done with this it will be my son's jeep and more than anything I want to make sure that it steers and handles on the road very safe.
Thanks Again
Walt
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Old 11-14-2011, 08:30 PM   #7
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A dropped case kit with a 205? That's a new one on me. I would invest in some 1410 yokes and that will solve any angle problem you have with a driveshaft.
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Old 11-14-2011, 10:09 PM   #8
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Re: NP205 TC with Drop Kit

Is there any problem with using a drop kit on a 205 transfer case? You seemed to not like it. Why would that be?

Walt
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Old 11-15-2011, 08:43 AM   #9
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I just dont understand the concept I guess. A 205 doesnt mount like a 231 and a c6 isnt even close to what a stock jeep tranny is. I guess I am more concerned of how its installed than what it called
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Old 11-15-2011, 01:09 PM   #10
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I will be working on intalling the engine, tranny anf TC through the winter, is there anything that I should be concerned with as I am getting closer to intalling them? I have done a few projects in the past, but all of them got bolted back where they came out. Let me know if you have any suggestions or steps that I should be looking into. Thanks for the help.

Walt
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Old 11-15-2011, 01:33 PM   #11
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Sure no problem, I was under the assumption that it was already done. Take a look at my build thread when you get some time. I am doing pretty much exactly what you are doing and I have some really good pics on how I did mine....feel free to PM me as well as I have done lots of ford swaps over the years

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