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Old 07-12-2019, 06:56 PM   #1
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1998 American Dream shakes when letting off accelerator

Feels like exhaust brakes are on but totally disconnected it with no change. Changed level of rear suspension so ujoint/driveshaft angle would not be problem. Put on all new tires. Took it to the Cummins dealer with no luck. Any help out there?
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Old 07-12-2019, 07:06 PM   #2
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Has the driveshaft and u joint's been inspected and greased good?
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Old 07-12-2019, 07:07 PM   #3
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That can be a sign of U-joint going bad, also differential problem (as the unloading of drive line stresses the pinon and ring gear on its coast side).
I would inspect the u-joints carefully to start with.
Good luck
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Old 07-12-2019, 10:12 PM   #4
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That can be a sign of U-joint going bad, also differential problem (as the unloading of drive line stresses the pinon and ring gear on its coast side).
I would inspect the u-joints carefully to start with.
Good luck
Thanks. The shop said they were ok but I am getting a second opinion.
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Old 07-12-2019, 11:10 PM   #5
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For sure sounds like a driveline issue.
The driveshaft must be "unloaded" when checking u-joints. Meaning not in a bind from parking brake or transmission.

Also since you free-hand adjusted the ride height, I'd for sure get that back to spec once you end up replacing u-joints....
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Old 07-13-2019, 12:15 AM   #6
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While re-checking the "U" joints, check the slip-joint in the middle of the driveshaft for binding, also make sure it is greased, it you have it greased mny lube jockeys that zerk fitting.

Be sure the ride-height is set to Spartan specs, for some reason it affects many other things. When you begin checking other things you will then be sure incorrect ride height is not affecting that. If you have a MM chassis, the ride height measurements are on page 2 here:http://pjrider.com/SpartanChassisSvc.pdf
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Old 07-15-2019, 07:21 AM   #7
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While re-checking the "U" joints, check the slip-joint in the middle of the driveshaft for binding, also make sure it is greased, it you have it greased mny lube jockeys that zerk fitting.

Be sure the ride-height is set to Spartan specs, for some reason it affects many other things. When you begin checking other things you will then be sure incorrect ride height is not affecting that. If you have a MM chassis, the ride height measurements are on page 2 here:http://pjrider.com/SpartanChassisSvc.pdf
Took the driveshaft out and confirmed u-joints are ok. Greased everything. Reset leveler heights to factory specs. No sign of seal or bearing damage on either rear axle. Still vibrating. Taking it to a different shop this morning.
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Old 07-15-2019, 04:08 PM   #8
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Took the driveshaft out and confirmed u-joints are ok. Greased everything. Reset leveler heights to factory specs. No sign of seal or bearing damage on either rear axle. Still vibrating. Taking it to a different shop this morning.
Issue resolved. The bracket for the rear leveler had broken and was replaced and configured backwards. We set the level correctly but when air needed to be added it was actually being released.
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Old 07-15-2019, 04:20 PM   #9
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Issue resolved. The bracket for the rear leveler had broken and was replaced and configured backwards. We set the level correctly but when air needed to be added it was actually being released.
How long ago was this done ? and how did ya just discover this ? Glad you found the problem .
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Old 07-16-2019, 09:58 AM   #10
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Issue resolved. The bracket for the rear leveler had broken and was replaced and configured backwards. We set the level correctly but when air needed to be added it was actually being released.
I would never have thought of the leveling solenoid being upside down. If diagnostics were easy, what would we do with the spare time.
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Old 08-16-2019, 04:26 PM   #11
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Issue resolved. The bracket for the rear leveler had broken and was replaced and configured backwards. We set the level correctly but when air needed to be added it was actually being released.
Did this problem cause a shimmy or shake at the front before you had it fixed?
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Old 10-22-2019, 10:03 PM   #12
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Im Dealing with the same problem vibration letting off the accelerator unloading the drive train iv got alot of porpoising also,, iv never notice by air ride bags pumped up this thread give me a place to start ,,, THX ill try to give a update soon
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