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This Icon Vehicle Dynamics 33700 Carrier Bearing Drop Shim Kit is a recommended item for SuperDuty owners that have modified the rear suspension height on their Ford F-250 or Ford F-350. This 33700 part number is identical to the older 3-37 part number, only the part number itself has changed. This Carrier Bearing Shim Kit can be used on all 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, and 2011 model year F250 and F350 Super Duty trucks equipped with a 2-piece rear driveshaft. Please note, this carrier bearing shim kit is for use with the rear driveshaft supplying power to the rear wheels, it is NOT to be used for any other application. The Icon 3-37 kit includes a collection of 1/8", 1/4" and 1/16" thick shims and longer bolts. The exact shim stack height can and will vary from truck to truck. Icon provides an instruction sheet with a recommended starting thickness based on the rear lift height. Item 33700 is offered as an option in the Icon Vehicle Dynamics line of suspension lifts and will help reduce driveline vibration by lowering the carrier bearing. The shim kit thickness is not a perfect science and may require some tinkering to find the sweet spot for your specific vehicle and lift height. This is because there are LOTS of different rear lift height options and not all trucks are 100% identical. Basically you will add or remove shims to the carrier bearing (raising or lowering it) until you are happy with the results. The best result will be one where rear driveline vibration is least noticeable when driving. If you have any questions regarding this or any other Icon Vehicle Dynamics product please click on the "ask a question" link located at the very top of this page.
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