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Old 03-07-2012, 04:09 PM   #1
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8.8 axle install

This is where my rig is at the current time. I need advice on the pinion angle to SYE. Woody driveshafts told me that typical pinion angle is 1-3 degrees lower than the SYE yoke (driveshaft line), but if there is a left or right offset (which there appears to be), then it may need to point straight at the center of the driveshaft line angle and there might need to be an ("anti sway bar"?) welded in to prevent the axle from twisting and thus vibrating during acceleration...

Need WF's experience and input with this install?

Also, appears I need to just bite bullet and measure with what I think the angle is so that I have the driveshaft to install with the perches and shock mounts tack welded to ensure no vibrations before I fully weld into place... Yes?

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Old 04-22-2012, 02:31 PM   #2
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So, for future SYE/8.8 axle upgrades, here is what I have found out since no one responded to my earlier post...

The 8.8 axle is a right side offset from the stock transfer case. A 1-3 degree downward angle is optimal for limiting driveshaft vibration.

With a SYE and an 8.8 and a 3.5-4" SUA lift, my driveshaft length ended up being 18.75" which I ordered from Tom Wood's. This distance needed to include the yoke to the 8.8. Hope this helps others. Any questions, feel free to ask.

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Old 04-23-2012, 05:59 AM   #3
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I'd say you should measure, per your own intuition. There's a lot of variances in place (what the previous owner might have done, stretching/wrapping issues, other things that might make your driveline longer/shorter/out of alignment) so measuring will be your best plan.
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Old 04-23-2012, 08:00 AM   #4
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Yeah, the 18.75" was arrived at by measuring both sides of the SYE yoke to corresponding point on the diff flange. Since there was a right side offset. Each were a different length. 18.75" was the reasonable mean between the two. In addition, Tom Woods support told me their driveshafts would have a plus and minus of at least .5" of play. Also, this is important in case the welder wanted to adjust the pinion angle before welding.
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Old 04-23-2012, 08:09 AM   #5
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I have a 8.8 in mine... no vibs if you don't count the clunk from detroit. the offset of the shaft to the sye does not look as bad as it first sounds.
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Old 04-23-2012, 09:46 AM   #6
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the easiest way that i have found to get the correct pinion angle is, when you are welding the spring perches onto the under side of the axle housing, make them exactly parallel to the spring perches or coil mounts that are on the top side of the housing. that puts you in the ball park for correct angle. If that angle worked on the explorer then it will work on the wrangler. thats how i did mine and a few others, and i have a SYE and a CV joint rear shaft with ZERO vibrations.

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