GM IFS STEER­ING FIX

Cog­nito up­grades to com­bat com­mon steer­ing woes

Ultimate Diesel Builder's Guide - - Contents -

Back in 1988, with the in­tro­duc­tion of the GMT400 pickup plat­form, Gen­eral Mo­tors made a rad­i­cal change: they in­tro­duced an in­de­pen­dent front sus­pen­sion (IFS) for 4x4 trucks, which pro­vided a smoother ride than the old straight axle. GM con­tin­ues to use an IFS in their trucks right up to the present day, but time has shown that this de­sign is not with­out its prob­lems.

As with any­thing that has more mov­ing parts, the IFS has a propen­sity to wear out steer­ing com­po­nents much faster than the old straight axle. The in­di­vid­ual com­po­nents don’t nec­es­sar­ily wear out any faster, but with more parts, the ac­cu­mu­la­tion of er­ror is greatly ac­cel­er­ated. If not ad­dressed promptly, the ac­cu­mu­la­tion can make th­ese trucks down­right scary to drive—it’s sur­pris­ing just how quickly small amounts of wear in the steer­ing can re­sult in an ac­cu­mu­la­tion of er­ror that be­comes un­man­age­able. If your truck has larger than stock tires, a lift, or both, the prob­lem be­comes ap­par­ent sooner than on a stock truck. In fact, sim­ply turn­ing up the front tor­sion bars can ac­cel­er­ate a truck’s steer­ing woes.

One of the best ways to ad­dress this prob­lem is to in­stall up­graded com­po­nents from Cog­nito Mo­tor­sports. Kit avail­abil­ity varies de­pend­ing on the year of your truck, with more op­tions for later-model trucks. Fol­low along and we’ll show you the high­lights of fix­ing the sus­pen­sion on a ‘08 Chevro­let 2500 HD us­ing com­po­nents from Cog­nito Mo­tor­sports (CMS). This up­grade fea­tures the Truck and SUV Pit­man/idler Arm Sup­port Kit and the Al­loy Se­ries Race Steer­ing Kit. Both kits are for ‘01-’10 8-lug ve­hi­cles and can be used on stock or lifted trucks. UDBG

Be­sides pro­vid­ing poor steer­ing re­sponse, a worn front end can and will cause ex­ces­sive tire wear. GM’S in­de­pen­dent front sus­pen­sion sys­tem is known for wear­ing the in­side edge of tires, and worn com­po­nents ac­cel­er­ate this greatly.

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