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Discussion Starter · #1 ·
It's a 79 f-150 dana 44 axle that I'm welding spring perches on this weekend. Going under the YJ along with a 9" rear. What's the stock caster for one of these?
Thanks. <IMG SRC="smilies/beer.gif" border="0">
 

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You want somewhere around 6 degrees positive for a Jeep.
 

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Factory caster setting for a TJ is seven degrees but I wouldn't try for that much if it's been lifted much. If you try for too much caster angle, that just increases the front driveshaft's u-joint angle too much which might cause vibration. This is one of those times for compromise.

Just about any angle over about five degrees should be fine. If it's a tall lift, five degrees might be about right but probably no more than that. This is one of those angles that isn't critical, so long as there is "enough" caster angle.
 

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Mike run it at 6 degrees. Sorry Ken charged you too much the other day. I guess you get a discount on the plates. <IMG SRC="smilies/biggrin.gif" border="0">
 

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when i redid the caster angle on my old scout d44 ( i rotated the knuckles) i set it a 8 degrees and i loved it. it handled very well even at high speeds. if you don't plan on moving the knuckles you have to find a happy medium between the caster angle and the pinion angle. i can't give specific numbers you'll just have to play with it. and see what looks right.
 

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I used a 79 Ford Bronco 44 which is the same as the F150. I set mine at 6 degrees and don't have any vibes or wobbles at highway speeds (when I can get up that fast). Mine is also under a YJ.
 

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Discussion Starter · #8 ·
Thanks for the info.

High5,
that's how I set up my Dana 30 when I went spring over. It worked fine. I just wanted to find out what it should be so I could get as close as I can and still have a good pinion angle.

Sounds like around 6 degrees is about right.

Steve,
It's all good. <IMG SRC="smilies/biggrin.gif" border="0"> I came up with an idea for the plates. I'll stop by and show you.

Insayn,
How is your pinion angle?

<IMG SRC="smilies/usa.gif" border="0"> <IMG SRC="smilies/usa.gif" border="0"> <IMG SRC="smilies/usa.gif" border="0"> <IMG SRC="smilies/usa.gif" border="0"> <IMG SRC="smilies/usa.gif" border="0"> <IMG SRC="smilies/usa.gif" border="0"> <IMG SRC="smilies/usa.gif" border="0">
 

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My pinion angle is just right. I don't have any problems with vibes there either. Here is how I mounted my perches if you need help there:
 

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Yes it is a RC 44. I had to have the perches TIG welded to the cast part and did a lot of grinding on the perches to get it to fit over the cast. Wish I had a cutting torch or plasma cutter so I can f*ck some sh*t up.
 

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Discussion Starter · #12 ·
Just got done today welding it all up. <IMG SRC="smilies/biggrin.gif" border="0"> I'll see how it drives next week after I'm done with the steering. The angles look really good! <IMG SRC="smilies/beer.gif" border="0"> Thanks.
 

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Insayn or anyone that knows, what is the benefit of your purch setup? I can only see a drawback to it. A simular setup for an SUA would protect the ends of the bolts, but with SOA your ubolts are already flipped so where is the benefit? Draw back? Well you put all the responsibility of retaining the axle on your spring purch. If your spring purch bust loose from the axle tube, your screwed. I've see this happen but luckily the guy had ubolts to keep the axle under the rig(he broke both spring purches loose). They were able to limp him off the trail and over the mountain to a welder. With that set up (above) he would have been screwed.
So, what is the benefit?
 

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I opted not to retube with new tube and on the axle I have I could not remove the casts like on some other versions. I found this to be easier than trying to have u bolts made along with a spring plate. If I got u bolts I would have had to do some major grinding on the pig which would have weakened it at the point where the tube enters. As for the weld breaking I doubt that it will happen. I had it professionally TIG welded and he welded it on the outside and about 3 inches on the inside. The only weight the weld will have to hold is the weight of the axle and tire. That isn't much weight in my opinion. As for any benefits of this setup...just ease.
 

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JNJ: Sounds like your buddy encountered reason #1 to leave the welding to a pro. Lots of people have buzzboxes in their garage, it doesnt make them a welder tho, even if they can stick some metal together. Glad he didnt trust his "welder" on his steering set up. Just my .02 <IMG SRC="smilies/biggrin.gif" border="0">
 
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