Timbrens are essentially a rubber spring. Usually the install involves removing the factory bump stop and installing the Timbren. Very simple and easy install. Works better than air bags and overload springs. Less expensive than the other options too. The biggest mistake guys make is installing the donut spacer that they send. You are supposed to have 1" of clearance between the timbren and axle (or stop). If you don't have the gap the ride is rough. I have timbrens on my '92 w350 Dodge(w/overloads), '97 dodge 2500, '03 2500, and on my W900 KW w/air ride.
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