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Old 08-16-2010, 01:21 PM   #1
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Adjustable Rear Control Arms and S.Y.E.

I just ordered an advance adaptors SYE/Tom Woods driveshaft combo. I'm having a hard time figuring out whether or not I need adjustable control arms or not, can some of you more experienced guys clue me in on this. Also how to adjust these once I order them? Its a 98 with rear Dana 35 and .456 gearing if that matters.

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Old 08-16-2010, 01:42 PM   #2
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Yes you absolutely need them. I am currently going through this right now with mine. The arms have a threaded end that can be tightened with a nut on the threads. You have to spin the head or the body of the arm to lengthen it or shorten it. Both arms need to be the same length to correct your pinion angle after the rear cv drive shaft is installed. I picked up my arms from currie enterprises.

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Old 08-16-2010, 01:48 PM   #3
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X2 on what BigSahara said above. Don't even try to drive your Jeep after installing the new Tom Wood (not Woods) CV driveshaft until you have properly set the rear pinion angle. If you don't adjust the rear pinion angle properly after installing the CV driveshaft, you will have major drivetrain vibrations. You can get away with just buying upper-rear adjustable length control arms to raise your rear pinion angle to where it needs to be. Lengthen the upper arms to the point the pinion angle is where it needs to be. Make sure both upper rear arms are set to the exact same length. I set the length of one control arm first to set the pinion angle and then I adjust the length of the other until it matches and its mounting bolt holes line up with the mounting bracket.

The pinion angle needs to be the same as the rear driveshaft angle. Equal to or perhaps 1-2 degrees under that of the driveshaft. However, the pinion angle cannot be even 1 degree above that above the driveshaft.

Here is how your rear axle's pinion angle should look after you adjust it up to match the slope of the driveshaft.
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Old 08-16-2010, 02:58 PM   #4
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Don't you need to install the SYE THEN measure for a correct length DS?
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Old 08-16-2010, 03:13 PM   #5
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Don't you need to install the SYE THEN measure for a correct length DS?
No, they got a pretty good formula on figuring out DS length. I measured before even installing my lift and they had a shaft made. Fit perfect and has plenty of travel.
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Old 08-16-2010, 04:20 PM   #6
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Good to know. Thanks, Az.
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Old 08-16-2010, 05:48 PM   #7
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Yep Tom Wood's shop has done enough TJ CV driveshafts that they have a very good handle on what length driveshaft various configurations and lift heights require.
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Old 08-19-2010, 09:54 PM   #8
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Thanks guys that helped me out alot. If only there were some good ones for less than 250..

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