Radius arm cam adjustment - Dodge Cummins Diesel Forum
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post #1 of 22 (permalink) Old 12-09-2019, 06:14 PM Thread Starter
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Radius arm cam adjustment

I couldn't break the top bolt loose even with a 1/2" breaker bar and a cheater pipe. I'm bringing my truck to a friend's shop to put the truck on the lift to get a better angle on it. I'm planning on lifting from the frame and letting the axles hang. My question is this: Once I have all four loose and then I adjust the cam bolt, should I tighten up the cam nut and then drive around the block with the top bolts loose so that everything settles, and then tighten the tops? Another question: Should I adjust the cams while the truck is resting on the tires, or will I be okay with the axle hanging?

I'm at zero toe in and my truck pulls to the right. Stock suspension. 2015 2500 4WD Laramie MC w/ 6.7 CTD.

Driver's side.


Passenger side.


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post #2 of 22 (permalink) Old 12-09-2019, 07:08 PM
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I don’t see anything wrong with axle hanging while you adjust. After adjustment tighten the bottom one first then tighten the top ones.

I wouldn’t drive around the block.

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post #3 of 22 (permalink) Old 12-09-2019, 09:44 PM
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What do you think youíre going to accomplish? You canít change caster individually by turning the cams on one side on a solid axle front end.
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post #4 of 22 (permalink) Old 12-09-2019, 10:14 PM Thread Starter
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He had an alignment rack where toe was in .01 degree increments, so we set the toe to 0.0. Then we decreased the caster to something more along the lines of Thuren's specs. With stock height, the least caster I could get on the driver's side was 3.7 degrees. The truck still has a slight pull to the right so I'm going to add just a bit more caster on the right side as recommended on CJC's site. The passenger side is currently 1/2 mark more than the driver's, and I've read that up to one full mark of cross-caster is okay. There is currently zero chassis lean on the front end.

Driver's side


Passenger side






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post #5 of 22 (permalink) Old 12-09-2019, 10:21 PM
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Looks good
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post #6 of 22 (permalink) Old 12-09-2019, 10:26 PM
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The cross caster they speak of is production tolerance when welding the C to the axle housing. You canít twist a solid axle. All your going to do is push that side forward in the wheel well.
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post #7 of 22 (permalink) Old 12-09-2019, 10:37 PM Thread Starter
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Quote:
Originally Posted by Jhenderson View Post
The cross caster they speak of is production tolerance when welding the C to the axle housing. You canít twist a solid axle. All your going to do is push that side forward in the wheel well.
"If your truck has a slight pull to one side, you can add a small amount of caster to the side it is pulling toward. This will make the truck straighten out.This is referred to as "cross caster" use it sparingly."

http://www.cjcoffroad.com/Articles.asp?ID=258

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post #8 of 22 (permalink) Old 12-10-2019, 09:25 AM
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Enlighten us all on how your going to twist the axle housing. What theyíre talking about is a bandaid unless your axle isnít centered in the wheel well to begin with. In that case itís not cross caster. Itís remedial attention. If the alignment is truly correct itís a tire pull and rotation is the remedy. As for your link, pay particular attention to ď notesĒ on caster.
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post #9 of 22 (permalink) Old 12-10-2019, 09:36 AM
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The above posts are correct in that you cannot add additional cross-caster to a solid front axle; the cross-caster is welded in. But the post that read "all you're going to do is push that side forward in the wheel well" is also correct and is why adjusting the cams slightly differently can make a difference in whether it drives straight. It also raises or lowers that side a little, making the truck sit level if it is not.

Did you try rotating the tires to see if they are the cause of your pull?

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post #10 of 22 (permalink) Old 12-10-2019, 10:19 AM Thread Starter
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The original Firestone Transforce AT tires pulled slightly to the right regardless of tire position, and my OE size Cooper ST Maxx tires also do the same.

Perhaps the pull was caused by too much toe in? I do know that because of the pull, the Firestones developed a wear pattern that indicated a pull to the right, and now my Coopers have also developed a strange wear pattern. Now that I know my toe is perfect at 0.0, I'll do a tire rotation and see what happens.

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post #11 of 22 (permalink) Old 12-10-2019, 10:38 AM
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after your caster adjustment. put the truck on the ground, then tighten the upper axle mount

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post #12 of 22 (permalink) Old 12-12-2019, 01:17 PM Thread Starter
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I rotated the tires and now the fronts are perfectly smooth. Unfortunately there is still a slight pull to the right. I'm going to add caster to the right so that it is exactly one line more than the left.

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'15 2500 Laramie, MC, 4WD, 68RFE, Granite Crystal - purchased 5/15
'02 2500 Laramie SLT, QC, LB, 4WD, NV5600, Black/Silver - sold
'97 2500 Laramie SLT, CC, 4WD, Goerend Bros 47RE, CPL2174, White - sold
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